Document:

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                                                                    Exhibit 10.2

                                                                     No. W-D____

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR INVESTMENT
AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR
ANY STATE SECURITIES LAWS. SUCH SECURITIES MAY NOT BE SOLD OR TRANSFERRED IN THE
ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION THEREFROM UNDER SAID ACT AND ANY
APPLICABLE STATE SECURITIES LAWS.

                      WARRANT TO PURCHASE _________ SHARES
                               OF COMMON STOCK OF
                         AMERICAN TECHNOLOGY CORPORATION
                           (Void after March 31, 2007)

     This certifies that _________________________________ or its assigns (the
"Holder"), for value received, is entitled to purchase from American Technology
Corporation, a Delaware corporation (the "Company"), having a place of business
at 13114 Evening Creek Drive South, San Diego, California 92128, a maximum of
______________ fully paid and nonassessable shares of the Company's Common Stock
("Common Stock") for cash at a price of Four Dollars and Fifty Cents ($4.50) per
share, as may be adjusted as provided herein (the "Stock Purchase Price"), at
any time or from time to time up to and including 5:00 p.m. (Pacific time) on
March 31, 2007 (the "Expiration Date"), upon surrender to the Company at its
principal office (or at such other location as the Company may advise the Holder
in writing) of this Warrant properly endorsed with the Form of Subscription
attached hereto duly filled in and signed and, if applicable, upon payment in
cash or by check of the aggregate Stock Purchase Price for the number of shares
for which this Warrant is being exercised determined in accordance with the
provisions hereof. The Stock Purchase Price and the number of shares purchasable
hereunder are subject to adjustment as provided in Section 3 of this Warrant.

     This warrant to purchase Common Stock (this "Warrant") is one of a series
of warrants issued pursuant to the Series D Preferred Stock and Warrant Purchase
Agreement dated as of April __, 2002 (the "Purchase Agreement"), which warrants
are collectively referred to herein as the "Warrants."

     This Warrant is subject to the following terms and conditions:

     1.   Exercise; Issuance Of Certificates; Payment For Shares.

          1.1  General. This Warrant is exercisable at the option of the holder
of record hereof, at any time or from time to time, up to the Expiration Date
for all or any part of the shares of Common Stock (but not for a fraction of a
share) which may be purchased hereunder. The Company agrees that the shares of
Common Stock purchased under this Warrant shall be and are deemed to be issued
to the Holder hereof as the record owner of such shares as of the close of
business on the date on which this Warrant shall have been surrendered, properly
endorsed, the completed, executed Form of Subscription delivered and payment
made for such shares.

                                       1.

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Certificates for the shares of Common Stock so purchased, together with any
other securities or property to which the Holder hereof is entitled upon such
exercise, shall be delivered to the Holder hereof by the Company at the
Company's expense within five (5) business days after the rights represented by
this Warrant have been so exercised. In case of a purchase of less than all the
shares which may be purchased under this Warrant, the Company shall cancel this
Warrant and execute and deliver a new Warrant or Warrants of like tenor for the
balance of the shares purchasable under the Warrant surrendered upon such
purchase to the Holder hereof within five (5) business days. Each stock
certificate so delivered shall be in such denominations of Common Stock as may
be requested by the Holder hereof and shall be registered in the name of such
Holder. Notwithstanding anything to the contrary set forth above, each exercise
of the Warrant shall cover at least the lesser of (i) 10,000 shares of Common
Stock (as adjusted for stock splits, stock dividends, combinations and the
like), or (ii) the total number of shares of Common Stock then subject to the
Warrant.

          1.2   Net Issue Exercise.

                (a)   Section 1.2(b) shall not apply and shall have no force or
effect if, in accordance with the terms of the Purchase Agreement, the shares of
Common Stock issuable upon exercise of this Warrant have been registered for
resale under the Securities Act of 1933, as amended, on a registration statement
on Form S-3, or another appropriate form.

                (b)   Notwithstanding any provisions herein to the contrary
(other than Section 1.2(a)), if the fair market value of one share of the
Company's Common Stock is greater than the Stock Purchase Price (at the date of
calculation as set forth below), in lieu of exercising this Warrant for cash,
the Holder may elect to receive shares equal to the value (as determined below)
of this Warrant (or the portion thereof being canceled) by surrender of this
Warrant at the principal office of the Company together with the properly
endorsed Form of Subscription and notice of such election in which event the
Company shall issue to the Holder a number of shares of Common Stock computed
using the following formula:

                X = Y (A-B)
                    -------
                       A

     Where X = the number of shares of Common Stock to be issued to the Holder

                              Y = the number of shares of Common Stock
                              purchasable under the Warrant or, if only a
                              portion of the Warrant is being exercised, the
                              portion of the Warrant being canceled (at the date
                              of such calculation)

                              A = the fair market value of one share of the
                              Company's Common Stock (at the date of such
                              calculation)

                              B = Stock Purchase Price (as adjusted to the date
                              of such calculation)

                                       2.

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For purposes of the above calculation, fair market value of one share of Common
Stock shall be the volume weighted average price of the Company's Common Stock
from the hours of 9:30 a.m. to 4:00 p.m. on the NASDAQ as reported by Bloomberg
Financial using the AQR function for the ten (10) trading days immediately
preceding the date of exercise for which there are reported transactions in the
Common Stock.

     2.   Shares To Be Fully Paid; Reservation Of Shares. The Company covenants
and agrees that all shares of Common Stock which may be issued upon the exercise
of the rights represented by this Warrant will, upon issuance, be duly
authorized, validly issued, fully paid and nonassessable and free from all
preemptive rights of any stockholder and free of all taxes, liens and charges
with respect to the issue thereof. The Company further covenants and agrees
that, during the period within which the rights represented by this Warrant may
be exercised, the Company will at all times have authorized and reserved, for
the purpose of issue or transfer upon exercise of the subscription rights
evidenced by this Warrant, a sufficient number of shares of authorized but
unissued Common Stock, or other securities and property, when and as required to
provide for the exercise of the rights represented by this Warrant. The Company
will take all such action as may be necessary to assure that such shares of
Common Stock may be issued as provided herein without violation of any
applicable law or regulation, or of any requirements of any domestic securities
exchange upon which the Common Stock may be listed; provided, however, that the
Company shall not be required to effect a registration under Federal or State
securities laws with respect to such exercise other than as provided pursuant to
the Purchase Agreement. The Company will not take any action which would result
in any adjustment of the Stock Purchase Price (as set forth in Section 3 hereof)
if the total number of shares of Common Stock issuable after such action upon
exercise of all outstanding warrants, together with all shares of Common Stock
then outstanding and all shares of Common Stock then issuable upon exercise of
all options and upon the conversion of all convertible securities then
outstanding, would exceed the total number of shares of Common Stock then
authorized by the Company's Certificate of Incorporation.

     3.   Adjustment Of Stock Purchase Price And Number Of Shares. The Stock
Purchase Price and the number of shares purchasable upon the exercise of this
Warrant shall be subject to adjustment from time to time upon the occurrence of
certain events described in this Section 3. Upon each adjustment of the Stock
Purchase Price, the Holder of this Warrant shall thereafter be entitled to
purchase, at the Stock Purchase Price resulting from such adjustment, the number
of shares obtained by multiplying the Stock Purchase Price in effect immediately
prior to such adjustment by the number of shares purchasable pursuant hereto
immediately prior to such adjustment, and dividing the product thereof by the
Stock Purchase Price resulting from such adjustment.

          3.1   Subdivision or Combination of Stock. In case the Company shall
at any time subdivide its outstanding shares of Common Stock into a greater
number of shares, the Stock Purchase Price in effect immediately prior to such
subdivision shall be proportionately reduced, and conversely, in case the
outstanding shares of Common Stock of the Company shall be combined into a
smaller number of shares, the Stock Purchase Price in effect immediately prior
to such combination shall be proportionately increased.

                                       3.

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          3.2   Dividends in Common Stock, Other Stock, Property,
Reclassification. If at any time or from time to time the Holders of Common
Stock (or any shares of stock or other securities at the time receivable upon
the exercise of this Warrant) shall have received or become entitled to receive,
without payment therefor,

                (a)  Common Stock or any shares of stock or other securities
which are at any time directly or indirectly convertible into or exchangeable
for Common Stock, or any rights or options to subscribe for, purchase or
otherwise acquire any of the foregoing by way of dividend or other distribution,

                (b)  any cash paid or payable otherwise than as a cash dividend,
or

                (c)  Common Stock or additional stock or other securities or
property (including cash) by way of spinoff, split-up, reclassification,
combination of shares or similar corporate rearrangement, (other than shares of
Common Stock issued as a stock split or adjustments in respect of which shall be
covered by the terms of Section 3.1 above),

then and in each such case, the Holder hereof shall, upon the exercise of this
Warrant, be entitled to receive, in addition to the number of shares of Common
Stock receivable thereupon, and without payment of any additional consideration
therefor, the amount of stock and other securities and property (including cash
in the cases referred to in clause (b) above and this clause (c)) which such
Holder would hold on the date of such exercise had he been the holder of record
of such Common Stock as of the date on which holders of Common Stock received or
became entitled to receive such shares or all other additional stock and other
securities and property.

          3.3   Reorganization, Reclassification, Consolidation, Merger or Sale.
If any recapitalization, reclassification or reorganization of the capital stock
of the Company, or any consolidation or merger of the Company with another
corporation, or the sale of all or substantially all of its assets or other
transaction shall be effected in such a way that holders of Common Stock shall
be entitled to receive stock, securities, or other assets or property (an
"Organic Change"), then, as a condition of such Organic Change, lawful and
adequate provisions shall be made by the Company whereby the Holder hereof shall
thereafter have the right to purchase and receive (in lieu of the shares of the
Common Stock of the Company immediately theretofore purchasable and receivable
upon the exercise of the rights represented hereby) such shares of stock,
securities or other assets or property as may be issued or payable with respect
to or in exchange for a number of outstanding shares of such Common Stock equal
to the number of shares of such stock immediately theretofore purchasable and
receivable upon the exercise of the rights represented hereby; provided,
however, that in the event the value of the stock, securities or other assets or
property (determined in good faith by the Board of Directors of the Company)
issuable or payable with respect to one share of the Common Stock of the Company
immediately theretofore purchasable and receivable upon the exercise of the
rights represented hereby is in excess of the Stock Purchase Price hereof
effective at the time of a merger and securities received in such
reorganization, if any, are publicly traded, then this Warrant shall expire
unless exercised prior to or simultaneous with such Organic Change. In the event
of any Organic Change, appropriate provision shall be made by the Company with
respect to the rights and interests of the Holder of this Warrant to the end
that the provisions hereof (including, without limitation,

                                       4.

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provisions for adjustments of the Stock Purchase Price and of the number of
shares purchasable and receivable upon the exercise of this Warrant) shall
thereafter be applicable, in relation to any shares of stock, securities or
assets thereafter deliverable upon the exercise hereof. The Company will not
effect any such consolidation, merger or sale unless, prior to the consummation
thereof, the successor corporation (if other than the Company) resulting from
such consolidation or the corporation purchasing such assets shall assume by
written instrument reasonably satisfactory in form and substance to the Holders
of a majority of the warrants to purchase Common Stock then outstanding,
executed and mailed or delivered to the registered Holder hereof at the last
address of such Holder appearing on the books of the Company, the obligation to
deliver to such Holder such shares of stock, securities or assets as, in
accordance with the foregoing provisions, such Holder may be entitled to
purchase.

          3.4   Certain Events. If any change in the outstanding Common Stock of
the Company or any other event occurs as to which the foregoing provisions of
this Section 3 are not strictly applicable or if strictly applicable would not
fairly protect the purchase rights of the Holder of the Warrant in accordance
with such provisions, then the Board of Directors of the Company shall make an
adjustment in the number and class of shares available under the Warrant, the
Stock Purchase Price or the application of such provisions, so as to protect
such purchase rights as aforesaid. The adjustment shall be such as will give the
Holder of the Warrant upon exercise for the same aggregate Stock Purchase Price
the total number, class and kind of shares as he would have owned had the
Warrant been exercised prior to the event and had he continued to hold such
shares until after the event requiring adjustment.

          3.5   Sale of Shares Below Stock Purchase Price.

                (a)  If at any time or from time to time after the date of the
Purchase Agreement (the "Issue Date"), the Company issues or sells, or is deemed
by the express provisions of this Section 3.5 to have issued or sold, Additional
Shares of Common Stock (as defined in Section 3.5(d) below), for an Effective
Price (as defined in Section 3.5(d) below) less than the then effective Stock
Purchase Price, then and in each such case the then existing Stock Purchase
Price shall be reduced, as of the opening of business on the date of such issue
or sale, to such lesser price.

                (b)  For the purpose of making any adjustment required under
this Section 3.5, the consideration received by the Company for any issue or
sale of securities shall (A) to the extent it consists of cash, be computed at
the amount of cash received by the Company without deduction for any
underwriting or similar commissions, compensation or concessions paid or allowed
by the Company in connection with such issue or sale, (B) to the extent it
consists of property other than cash, be computed at the fair value of that
property as determined in good faith by the Board of Directors, and (C) if
Additional Shares of Common Stock, Convertible Securities (as defined in Section
3.5(c)) or rights or options to purchase either Additional Shares of Common
Stock or Convertible Securities are issued or sold together with other stock or
securities or other assets of the Company for a consideration which covers both,
be computed as the portion of the consideration so received that may be
reasonably determined in good faith by the Board of Directors to be allocable to
such Additional Shares of Common Stock, Convertible Securities or rights or
options.

                                       5.

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          (c)   For the purpose of the adjustment required under this Section
3.5, if the Company issues or sells (i) stock or other securities convertible
into, Additional Shares of Common Stock (such convertible stock or securities
being herein referred to as "Convertible Securities") or (ii) rights or options
for the purchase of Additional Shares of Common Stock or Convertible Securities
and if the Effective Price of such Additional Shares of Common Stock is less
than the Stock Purchase Price, in each case the Company shall be deemed to have
issued at the time of the issuance of such rights or options or Convertible
Securities the maximum number of Additional Shares of Common Stock issuable upon
exercise or conversion thereof and to have received as consideration for the
issuance of such shares an amount equal to the total amount of the
consideration, if any, received by the Company for the issuance of such rights
or options or Convertible Securities, plus, in the case of such rights or
options, the minimum amounts of consideration, if any, payable to the Company
upon the exercise of such rights or options, plus, in the case of Convertible
Securities, the minimum amounts of consideration, if any, payable to the Company
(other than by cancellation of liabilities or obligations evidenced by such
Convertible Securities) upon the conversion thereof; provided that if in the
case of Convertible Securities the minimum amounts of such consideration cannot
be ascertained, but are a function of antidilution or similar protective
clauses, the Company shall be deemed to have received the minimum amounts of
consideration without reference to such clauses; provided further that if the
minimum amount of consideration payable to the Company upon the exercise or
conversion of rights, options or Convertible Securities is reduced over time or
on the occurrence or non-occurrence of specified events other than by reason of
antidilution adjustments, the Effective Price shall be recalculated using the
figure to which such minimum amount of consideration is reduced; provided
further that if the minimum amount of consideration payable to the Company upon
the exercise or conversion of such rights, options or Convertible Securities is
subsequently increased, the Effective Price shall be again recalculated using
the increased minimum amount of consideration payable to the Company upon the
exercise or conversion of such rights, options or Convertible Securities. No
further adjustment of the Stock Purchase Price, as adjusted upon the issuance of
such rights, options or Convertible Securities, shall be made as a result of the
actual issuance of Additional Shares of Common Stock on the exercise of any such
rights or options or the conversion of any such Convertible Securities. If any
such rights or options or the conversion privilege represented by any such
Convertible Securities shall expire without having been exercised, the Stock
Purchase Price as adjusted upon the issuance of such rights, options or
Convertible Securities shall be readjusted to the Stock Purchase Price which
would have been in effect had an adjustment been made on the basis that the only
Additional Shares of Common Stock so issued were the Additional Shares of Common
Stock, if any, actually issued or sold on the exercise of such rights or options
or rights of conversion of such Convertible Securities, and such Additional
Shares of Common Stock, if any, were issued or sold for the consideration
actually received by the Company upon such exercise, plus the consideration, if
any, actually received by the Company for the granting of all such rights or
options, whether or not exercised, plus the consideration received for issuing
or selling the Convertible Securities actually converted, plus the
consideration, if any, actually received by the Company (other than by
cancellation of liabilities or obligations evidenced by such Convertible
Securities) on the conversion of such Convertible Securities.

          (d)   "Additional Shares of Common Stock" shall mean all shares of

                                       6.

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Common Stock issued by the Company or deemed to be issued pursuant to this
Section 3.5, other than (A) shares of Common Stock issued or issuable upon
conversion of the Company's Series D Preferred Stock or upon exercise of the
Warrants; (B) shares of Common Stock and/or options, warrants or other Common
Stock purchase rights, and the Common Stock issued pursuant to such options,
warrants or other rights to employees, officers or directors of, or consultants
or advisors to, the Company or any subsidiary pursuant to stock purchase or
stock option plans, agreements or other arrangements that are approved by the
Board of Directors; (C) shares of Common Stock issued or issuable pursuant to
the exercise of options, warrants or convertible securities outstanding as of
the Issue Date; (D) shares of Common Stock issued or issuable for consideration
other than cash pursuant to a merger, consolidation, acquisition or similar
business combination approved by the Board of Directors; (E) shares of Common
Stock issued or issuable pursuant to any equipment leasing arrangement; (F)
shares of Common Stock issued or issuable pursuant to any debt financing from a
bank or similar financial institution approved by the Board of Directors; (G)
shares of Common Stock issued or issuable with the approval of the Board of
Directors to customers or vendors of the Company or to persons with similar
commercial relationships with the Company; (H) shares of Common Stock issued or
issuable pursuant to corporate partnering transactions on terms approved by the
Board of Directors; and (I) up to 25,000 shares of Common Stock (as adjusted for
stock splits, stock dividends, stock combinations and the like) issued or deemed
issued pursuant to this Section 3.5 during any 180-day period commencing on or
after the Issue Date and which are not otherwise excluded from the definition of
Additional Shares of Common Stock pursuant to the foregoing provisions of this
subsection (d). References to Common Stock in the subclauses of this Section
3.5(d) above shall mean all shares of Common Stock issued by the Company or
deemed to be issued pursuant to this Section 3.5. The "Effective Price" of
Additional Shares of Common Stock shall mean the quotient determined by dividing
the total number of Additional Shares of Common Stock issued or sold, or deemed
to have been issued or sold by the Company under this Section 3.5, into the
aggregate consideration received, or deemed to have been received by the Company
for such issue under this Section 3.5, for such Additional Shares of Common
Stock.

          3.6  Notices of Change.

               (a)  Within 10 business days after any adjustment in the number
or class of the shares subject to this Warrant and of the Stock Purchase Price,
the Company shall give written notice thereof to the Holder, setting forth in
reasonable detail and certifying the calculation of such adjustment.

               (b)  The Company shall give written notice to the Holder at least
15 business days prior to the date on which the Company closes its books or
takes a record for determining rights to receive any dividends or distributions.

               (c)  The Company shall also give written notice to the Holder at
least 15 business days prior to the date on which an Organic Change shall take
place.

     4.   Issue Tax. The issuance of certificates for shares of Common Stock
upon the exercise of the Warrant shall be made without charge to the Holder of
the Warrant for any issue tax (other than any applicable income taxes) in
respect thereof; provided, however, that the

                                       7.

<PAGE>

Company shall not be required to pay any tax which may be payable in respect of
any transfer involved in the issuance and delivery of any certificate in a name
other than that of the then Holder of the Warrant being exercised.

     5.   Closing Of Books. The Company will at no time close its transfer books
against the transfer of any warrant or of any shares of Common Stock issued or
issuable upon the exercise of any warrant in any manner which interferes with
the timely exercise of this Warrant.

     6.   No Voting Or Dividend Rights; Limitation Of Liability. Other than as
set forth herein, nothing contained in this Warrant shall be construed as
conferring upon the Holder hereof the right to vote or to consent or to receive
notice as a shareholder of the Company or any other matters or any rights
whatsoever as a shareholder of the Company. No dividends or interest shall be
payable or accrued in respect of this Warrant or the interest represented hereby
or the shares purchasable hereunder until, and only to the extent that, this
Warrant shall have been exercised. No provisions hereof, in the absence of
affirmative action by any holder, and no mere enumeration herein of the rights
or privileges of the holder hereof, shall give rise to any liability of such
Holder for the Stock Purchase Price or as a shareholder of the Company, whether
such liability is asserted by the Company or by its creditors.

     7.   Warrants Transferable. Subject to compliance with applicable federal
and state securities laws, this Warrant and all rights hereunder are
transferable, in whole or in part, without charge to the holder hereof (except
for transfer taxes), upon surrender of this Warrant properly endorsed. Each
taker and holder of this Warrant, by taking or holding the same, consents and
agrees that this Warrant, when endorsed in blank, shall be deemed negotiable,
and that the holder hereof, when this Warrant shall have been so endorsed, may
be treated by the Company, at the Company's option, and all other persons
dealing with this Warrant as the absolute owner hereof for any purpose and as
the person entitled to exercise the rights represented by this Warrant, or to
the transfer hereof on the books of the Company any notice to the contrary
notwithstanding; but until such transfer on such books, the Company may treat
the registered owner hereof as the owner for all purposes.

     8.   Rights And Obligations Survive Exercise Of Warrant. The rights and
obligations of the Company, of the holder of this Warrant and of the holder of
shares of Common Stock issued upon exercise of this Warrant, shall survive the
exercise of this Warrant.

     9.   Modification And Waiver. This Warrant and any provision hereof may be
changed, waived, discharged or terminated only by an instrument in writing
signed by the party against which enforcement of the same is sought; provided,
however, that any term of this Warrant may be amended with the written consent
of the Company and the holders of Warrants representing a majority in interest
of the shares of Common Stock then issuable upon exercise of the Warrants issued
pursuant to the Purchase Agreement, and any amendment so effected shall be
binding upon each holder of such Warrants.

     10.  Notices. Any notice, request or other document required or permitted
to be given or delivered to the holder hereof or the Company shall be delivered
or shall be sent by certified mail, postage prepaid, to each such holder at its
address as shown on the books of the

                                       8.

<PAGE>

Company or to the Company at the address indicated therefor in the first
paragraph of this Warrant or such other address as either may from time to time
provide to the other.

     11.  Binding Effect On Successors. This Warrant shall be binding upon any
corporation succeeding the Company by merger, consolidation or acquisition of
all or substantially all of the Company's assets. All of the obligations of the
Company relating to the Common Stock issuable upon the exercise of this Warrant
shall survive the exercise and termination of this Warrant. All of the covenants
and agreements of the Company shall inure to the benefit of the successors and
assigns of the holder hereof.

     12.  Descriptive Headings And Governing Law. The description headings of
the several sections and paragraphs of this Warrant are inserted for convenience
only and do not constitute a part of this Warrant. This Warrant shall be
construed and enforced in accordance with, and the rights of the parties shall
be governed by, the laws of the State of California.

     13.  Lost Warrants. The Company represents and warrants to the Holder
hereof that upon receipt of evidence reasonably satisfactory to the Company of
the loss, theft, destruction, or mutilation of this Warrant and, in the case of
any such loss, theft or destruction, upon receipt of an indemnity reasonably
satisfactory to the Company, or in the case of any such mutilation upon
surrender and cancellation of such Warrant, the Company, at its expense, will
make and deliver a new Warrant, of like tenor, in lieu of the lost, stolen,
destroyed or mutilated Warrant.

     14.  Fractional Shares. No fractional shares shall be issued upon exercise
of this Warrant. The Company shall, in lieu of issuing any fractional share, pay
the holder entitled to such fraction a sum in cash equal to such fraction
multiplied by the then effective Stock Purchase Price.

     15.  Specific Performance. The parties hereto hereby declare that it is
impossible to measure in money the damages which will accrue to a party hereto
or to their heirs, personal representatives, or assigns by reason of a failure
to perform any of the obligations under this Warrant and agree that the terms of
this Warrant shall be specifically enforceable. If any party hereto or his
heirs, personal representatives, or assigns institutes any action or proceeding
to specifically enforce the provisions hereof, any person against whom such
action or proceeding is brought hereby waives the claim or defense therein that
such party or such personal representative has an adequate remedy at law, and
such person shall not offer in any such action or proceeding the claim or
defense that such remedy at law exists.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                       9.

<PAGE>

     In Witness Whereof, the Company has caused this Warrant to be duly executed
y its officers, thereunto duly authorized this ______ day of April, 2002.

                                        American Technology Corporation,
                                        a Delaware corporation

                                        By:_____________________________________
                                                Title:
                                                Name:

ATTEST:

_______________________________
Name:
                                        Title:

                                       10.

<PAGE>

                                    Exhibit A

                                SUBSCRIPTION FORM

                                             Date:  _________________, _____

American Technology Corporation
13114 Evening Creek Drive South
San Diego, California 92128

Attn: President

Ladies and Gentlemen:

     The undersigned hereby elects to exercise the warrant issued to it by
American Technology Corporation (the "Company") and dated April _____, 2002,
Warrant No. W-D___ (the "Warrant") and to purchase thereunder
___________________________ shares of the Common Stock of the Company (the
"Shares") at a purchase price of Four Dollars and Fifty Cents ($4.50) per Share
for an aggregate purchase price of _____________________ Dollars ($__________)
(the "Purchase Price").

     Pursuant to the terms of the Warrant the undersigned has delivered the
aggregate Purchase Price herewith in full in cash or by certified check or wire
transfer.

                                            Very truly yours,

                                            ____________________________________

                                            By: ________________________________

                                            Title: _____________________________

                                       11.Prepared by R.R. Donnelley Financial -- Credit Agreement - Amendment 2 dated 12/31/2001

 EXHIBIT 10.22 
  
 AMENDMENT
NO. 2 TO CREDIT AGREEMENT 
  

	 	    This AMENDMENT NO. 2 TO CREDIT AGREEMENT is made and entered into as of December 31, 2001, by and among CENTURY MAINTENANCE SUPPLY, INC., a Delaware
corporation (the “Borrower”), and the Required Lenders (as defined in Article I of the Credit Agreement). 
 

  
 RECITALS 
  
 A.    The Borrower, the Lenders (as defined in Article I of the Credit Agreement),
Salomon Brothers Inc, and Citicorp USA, Inc., entered into a Credit Agreement dated as of July 8, 1998 (as amended and otherwise modified to the date hereof, the “Credit Agreement”). Capitalized terms used herein and not otherwise
defined shall have the meanings assigned to them in the Credit Agreement. 
  
 B.    The Borrower requested
certain changes to the Credit Agreement, and has agreed to certain changes to other provisions of the Credit Agreement. 
  
 C.    The Required Lenders are willing to so amend the Credit Agreement on the terms and conditions set forth herein. 
  
 D.    The Borrower and the Required Lenders are entering into this Amendment pursuant to Section 9.08(b) of the Credit Agreement. 
  
 AGREEMENTS 
  
 In consideration of the foregoing recitals, and for
other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Borrower and the Required Lenders agree as follows: 
  
 SECTION 1.    Defined Terms.  The definition of “EBITDA” in Section 1.01 of the Credit Agreement is amended in its entirety to read as follows: 
  
 “EBITDA” means, (except as otherwise indicated), for any period, an amount equal to, for the Borrower and its
consolidated Restricted Subsidiaries, (a) the sum of Consolidated Net Income for such period, plus the following to the extent reducing Consolidated Net Income for such period: (i) the provision for taxes based on income or profits or utilized in
computing net loss, (ii) Consolidated Interest Expense, (iii) depreciation, (iv) amortization, (v) solely for fiscal year 2001, inventory writeoffs that are up to $1,000,000 and (vi) any other non-cash items (other than any such non-cash item to the
extent that it represents an accrual of or reserve for cash expenditures in any future period), minus (b) all non-cash items increasing Consolidated Net Income for such period (other than any such non-cash item to the extent that it will result in
the receipt of 

 cash payments in any future period). Notwithstanding the foregoing, the provision for taxes based on the income or profits of, and the
depreciation and amortization of, a Restricted Subsidiary shall be added to Consolidated Net Income to compute EBITDA only to the extent (and in the same proportion) that the net income of such Restricted Subsidiary was included in calculating
Consolidated Net Income and only if a corresponding amount would not be prohibited at the date of determination from being dividended to the Borrower by such Restricted Subsidiary without prior approval (that has not been obtained), pursuant to the
terms of any consensual restriction. 
  
 SECTION 2.    Investments, Loans and
Advances.  Subsection (e) of Section 6.03 of the Credit Agreement is amended in its entirety to read as follows: 
  
 (e)  Investments made in connection with Permitted Acquisitions; 
  
 SECTION
3.    Mergers, Consolidations, Sales of Assets and Acquisitions.  Subsection (c) of Section 6.04 of the Credit Agreement is amended in its entirety to read as follows: 
  
 (c)  The Borrower will not, and will not permit any Restricted Subsidiary to, purchase, lease, or otherwise acquire (in one
transaction or a series of transactions) any Assets or Capital Stock of any person other than in the ordinary course of the Borrower’s business, or in connection with a Permitted Acquisition. 
  
 SECTION 4.    Debt/Adjusted EBITDA Ratio.  Section 6.10 of the Credit Agreement is amended in its entirety to read
as follows: 
  
 SECTION 6.10    Debt/Adjusted EBITDA Ratio.  The
Debt/Adjusted EBITDA Ratio shall not exceed the following amounts as of the ends of fiscal quarters of the Borrower ending nearest to the following dates: 
  
 
	 Fiscal Quarter
Ending Nearest to
 
	  	 Debt/Adjusted EBITDA Ratio
 

	  	 1998
 
	  	 1999
 
	  	 2000
 
	  	 2001
 
	  	 2002
 
	  	 2003
 
	  	 2004
 
	  	 2005
 

	 March 31
 	  	  	  	 4.25
 	  	 3.50
 	  	 3.25
 	  	 2.85
 	  	 2.25
 	  	 2.00
 	  	 2.00
 
	 June 30
 	  	  	  	 4.25
 	  	 3.50
 	  	 3.25
 	  	 2.85
 	  	 2.25
 	  	 2.00
 	  	 2.00
 
	 September 30
 	  	 4.25
 	  	 4.25
 	  	 3.50
 	  	 3.25
 	  	 2.85
 	  	 2.00
 	  	 2.00
 	  	 2.00
 
	 December 31
 	  	 4.25
 	  	 3.50
 	  	 3.25
 	  	 2.75
 	  	 2.25
 	  	 2.00
 	  	 2.00
 	  	 2.00
 

 
  
 and thereafter, 2.00. 
  
 SECTION 5. Minimum EBITDA. Section 6.11 of the Credit Agreement is amended in its entirety to read as follows: 
  
 SECTION 6.11. Minimum EBITDA. The EBITDA for the fiscal year of the Borrower shall not be less than the following amounts as of the end of the following fiscal
years: 
 

 2 

  
 
	 Fiscal Year
Ending Nearest
to December 31,
 
	    	 Minimum EBITDA
 

	 2000
 	    	 $29,000,000
 
	 2001
 	    	 30,000,000
 
	 2002
 	    	 28,000,000
 
	 2003
 	    	 44,000,000
 
	 2004
 	    	 50,000,000
 
	 2005 and thereafter
 	    	 58,000,000
 

 
  
 SECTION 6.    Fixed Charge Coverage
Ratio.  Section 6.13 of the Credit Agreement is amended in its entirety to read as follows: 
  
 SECTION 6.13    Fixed Charge Coverage Ratio.  The Fixed Charge Coverage Ratio for the period of four fiscal quarters ending nearest to each of the following dates, shall not be less than the following
ratios: 
  
 
	 Fiscal Quarter
Ending Nearest to
 
	  	 Fixed Charge Coverage Ratio
 

	  	 2000
 
	  	 2001
 
	  	 2002
 
	  	 2003
 
	  	 2004
 
	  	 2005
 

	 March 31
 	  	 1.20
 	  	 1.10
 	  	 1.00
 	  	 1.00
 	  	 1.05
 	  	 1.05
 
	 June 30
 	  	 1.20
 	  	 1.10
 	  	 1.00
 	  	 1.00
 	  	 1.05
 	  	 1.05
 
	 September 30
 	  	 1.20
 	  	 1.10
 	  	 1.00
 	  	 1.05
 	  	 1.05
 	  	 1.05
 
	 December 31
 	  	 1.10
 	  	 1.10
 	  	 1.00
 	  	 1.05
 	  	 1.05
 	  	 1.05
 

 
  
 and thereafter, 1.05. 
  
 SECTION 7.    Binding Effect and Effectiveness.  This Amendment may be executed in as many counterparts as may be convenient and shall become binding
when the Borrower, and the Required Lenders have each executed and delivered at least one counterpart, and shall become effective upon satisfaction of the following condition precedent: the Borrower shall have paid to each Lender that executes this
Agreement an amendment fee equal to 0.25% of such Lender’s Revolving Credit Commitment and outstanding Term Loans as of the date of this Amendment. 
  
 SECTION 8.    Governing Law.  This Amendment shall be a contract made under and governed by the laws of the State of New York, without regard to the conflicts of law provisions
thereof. 
  
 SECTION 9.    Reference to Credit Agreement.  Except as amended hereby, the
Credit Agreement shall remain in full force and effect and is hereby ratified and confirmed in all 
 

 3 

 respects. On and after the effectiveness of the amendment to the Credit Agreement accomplished hereby, each reference in the Credit Agreement, to “this
Agreement”, “hereunder”, “hereof”, “herein” or words of like import, and each reference to the Credit Agreement shall be deemed a reference to the Credit Agreement, as amended hereby, as the case may be.

  
 IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 2 to Credit Agreement to be duly executed by their
respective officers as of the date first above written. 
  
 
	 CENTURY MAINTENANCE SUPPLY, INC.
 
	 
	 by
 	 	 /s/  RICHARD PENICK
 

	  	 	 Name:   Richard Penick
 Title:    Vice-President
 

 
  
  
 
	 Acknowledged by:
 
	 
	 CITICORP USA, INC., as Administrative Agent and Collateral Agent
 
	 
	 by
 	 	 /s/  SUZANNE CRYMES
 

	  	 	 Name:   Suzanne Crymes
 Title:    Vice President
 

 
  
 
	 SALOMON SMITH BARNEY INC., as Arranger, Advisor and Syndication Agent,
 
	 
	 by
 	 	 /s/  SUZANNE CRYMES
 

	  	 	 Name:   Suzanne Crymes
 Title:    Attorney-in-Fact
 

 
 

 4 

  
 LENDERS 
  
 
	 CITICORP USA, INC.
 
	 
	 By:
 	 	 /s/    SUZANNE CRYMES        
 

	  	 	 Name:   Suzanne Crymes
 Title:    Vice President
 

 
  
 
	 AIM FLOATING RATE FUND
 
	 By: INVESCO Senior Secured Management, Inc. As Attorney in fact
 
	 
	 By:
 	 	 /s/    ANNE M.
MCCARTHY        
 

	  	 	 Name:   Anne M. McCarthy
 Title:    Authorized Signatory
 

 
  
 
	 FIRST UNION NATIONAL BANK
 
	 
	 By:
 	 	 /s/    MARK B. FELKER        
 

	  	 	 Name:   Mark B. Felker
 Title:    Senior Vice President
 

 
  
 
	 ING US CAPITAL CORPORATION
 
	 
	 By:
 	 	 

	  	 	 Name:   
 Title:    
 

 
  
 
	 KZH ING - 1 L.L.C.
 
	 
	 By:
 	 	 

	  	 	 Name:   
 Title:    
 

 
 

 5 

  
 
	 KZH ING-2 L.L.C.
 
	 
	 By:
 	 	 /s/    ANTHONY IARROBINO
 

	  	 	 Name:   Anthony Iarrobino
 Title:    Authorized Agent
 

 
  
 
	 ROYAL BANK OF CANADA,
 
	 
	 By:
 	 	 /s/    SUZANNE KAICHER        
 

	  	 	 Name:   Suzanne Kaicher
 Title:    Manager
 

 
  
 
	 KZH SOLEIL-2 L.L.C.,
 
	 
	 By:
 	 	 /s/    ANTHONY IARROBINO        
 

	  	 	 Name:   Anthony Iarrobino
 Title:    Authorized Agent
 

 
  
 
	 TRANSAMERICA LIFE INSURANCE AND ANNUITY COMPANY,
 
	 
	 By:
 	 	 /s/    BILL HENRICKSON        
 

	  	 	 Name:   Bill Henrickson
 Title:    Vice President
 

 
  
 
	 WELLS FARGO BANK,
 
	 
	 By:
 	 	 /s/    S. MICHAEL ST.
GEME        
 

	  	 	 Name:   S. Michael St. Geme
 Title:    Vice President
 

 
  
 
	 DRESDNER BANK AG,
 New York and Grand Cayman Branches
 
	 
	 By:
 	 	 /s/    FARAAZ KAMRAN        
 

	  	 	 Name:   Faraaz Kamran
 Title:    Assistant Vice President
 

 
  
 
	  
	 
	 By:
 	 	 /s/    GABRIELA FIELDS        
 

	  	 	 Name:   Gabriela Fields
 Title:    Associate
 

 
  
 

 6 

  
 
	 GALAXY CLO 1999-1 LTD,
 
	 
	 By:
 	 	 /s/    THOMAS G. BRANDT        
 

	  	 	 Name:   Thomas G. Brandt
 Title:    Authorized Agent
 

 
  
 
	 KZH CYPRESSTREE-1 LLC
 
	 
	 By:
 	 	 /s/    ANTHONY IARROBINO        
 

	  	 	 Name:   Anthony Iarrobino
 Title:    Authorized Agent
 

 
  
 
	 KZH STERLING LLC
 
	 
	 By:
 	 	 /s/    ANTHONY IARROBINO        
 

	  	 	 Name:   Anthony Iarrobino
 Title:    Authorized Agent
 

 
  
 
	 SEQUILS-CENTURION V. LTD.,
 
	 
	 By:
 	 	 /s/    MICHAEL M. LEYLAND        
 

	  	 	 Name:   Michael M. Leyland
 Title:    Managing Director
 

 
  
 
	 CENTURION CDO II, LTD.,
 
	 By: American Express Asset Management Group
 Inc, as Collateral Manager
 
	 
	 By:
 	 	 /s/    MICHAEL M. LEYLAND        
 

	  	 	 Name:   Michael M. Leyland
 Title:    Managing Director
 

 
  
 
	  

 
 

 7 

  
 
	 SEQUILS-ING 1 (HBDGM), LTD.,
 
	  	 	  
	 By ING Capital Advisors, LLC, as Collateral Manager
 
	 
	 By:
 	 	 /s/    KURT WEGLEITNER        
 

	  	 	 Name:   Kurt Wegleitner
 Title:    Sr. Vice President
 

 
  
 
	 ENDURANCE CLO I, LTD.,
 
	  	 	  
	 By ING Capital Advisors, LLC, as Portfolio Manager
 
	 
	 By:
 	 	 /s/    KURT WEGLEITNER        
 

	  	 	 Name:   Kurt Wegleitner
 Title:    Sr. Vice President
 

 
 

 8

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