Document:

<PAGE>   1
                                                                 EXHIBIT 10.10.1

[THE OMNI GROUP OF COMPANIES Logo]

December 30, 1999

Mr. Dave Richards
Rockford Corporation
P.O. Box 1860
Tempe, AZ  85280-1860

Re:  2055 & 2075 E. 5th Street
     Tempe, AZ

Dear Mr. Richards:

I am in receipt of your letter dated December 18, 1999, in which you advise us
of your intention to exercise Option 4 as noted in the Amendment No. 2 to
Standard Industrial Lease - Gross (Amendment Options). A copy of your letter has
been forwarded to the Lessor and we hereby acknowledge the extension of your
Lease Agreement from January 1, 2001 through December 31, 2001.

Your continued business is appreciated. Should you have any questions, please do
not hesitate to contact me at 480/945-8989 ext. 111.

Sincerely,

/s/ Pat Busadzija

Patricia A. Buzadzija
Property Manager
<PAGE>   2
                                                                 EXHIBIT 10.10.1

[ROCKFORD CORPORATION Logo]

December 18, 1999

Faith McClintock
Omni Management Group, Inc.
4330 N. Civic Center Plaza
Scottsdale, AZ  85251-3528

RE:  2055 & 2075 E. 5th Street, Temps, AZ (Lease Extension)

Please accept this letter as our notice to exercise Option 4 covering the period
of January 1, 2001 through December 31, 2001, as noted in Amendment No. 2 to
Standard Industrial Lease-Gross (Amendment Options).

Sincerely,

ROCKFORD CORPORATION

/s/ Dave Richard

Dave Richards
V.P. IT/Facilities<PAGE>   1
                                                                 EXHIBIT 10.11.1

                               AMENDMENT TO LEASE

                  THIS AMENDMENT TO LEASE ("Amendment") is made as of THE OCT
5th, 1998, by and between CARBONNEAU FAMILY LIMITED PARTNERSHIP, a Michigan
limited partnership, of 133 Robinhood Drive, S.E., Grand Rapids, Michigan 49546
("Lessor"), and ROCKFORD CORPORATION, an Arizona corporation, of 613 South
Rockford Drive, Tempe, Arizona 85281 ("Lessee") based on the following facts:

         A. Lessor's predecessor in title, Carbonneau Industries, Inc., and
Lessee, entered into a certain Lease Agreement dated October 27, 1986, effective
as of September 1, 1986 and amended as of October 1, 1988 (collectively,
"Lease") for the demise of certain premises commonly known as 609 Myrtle Street,
N.W., and 600 Webster, N.W., Grand Rapids, Michigan (collectively, "Grand Rapids
Plant").

         B. By its terms, the Lease is scheduled to terminate as of midnight,
March 31, 1999, which is ten years after the "New Plant Completion Date," as
defined in the Lease. However, Lessor and Lessee desire to extend the Lease
term, and provide Lessee with additional options to renew the Lease.

         C. To accomplish such purposes, Lessor and Lessee desire to amend the
Lease as provided in this Amendment.

         NOW THEREFORE, Lessor and Lessee amend the Lease as follows:

         1. TERM. The fifth introductory paragraph of the Lease is amended in
part to provide that the Lease shall be "for a period commencing September 1,
1986, and ending March 31, 2001."

         2. RENT.

         (a) Paragraph 2(j) of the Lease is amended in its entirety to
substitute the following paragraphs:

                  (j-1) From September 1, 1998, through March 31, 1999, at the
         rate of $10,000 per month,

                  (j-2) From April 1, 1999, through March 31, 2001, at the rate
         of $11,000 per month.

         (b) Paragraph 2(o) is amended in its entirety to substitute the
following subparagraph:

                  (o) At the rate of $4.73 per square foot from April 1, 1997,
         through March 31, 2001.

         3. RENEWAL OPTIONS. The following additional subparagraph is added to
Paragraph 16 of the Lease:
<PAGE>   2
                  (j) Options to Renew. So long as Lessee is not then in default
         under this Lease, Lessee shall have three (3) options to renew this
         Lease for additional terms of one (1) year each, upon giving Lessor at
         least one hundred eighty (180) days written notice of the exercise of
         such option prior to the then scheduled termination date of the Lease.
         Each such renewal shall be on the same terms and conditions as set
         forth in this Lease, with the exception that the Rent payable under
         this Lease shall be increased at the commencement of each such renewal
         term by three percent (3%) over the Rent payable for the period
         immediately prior to such renewal.

         4. RATIFICATION. Except as expressly amended by this Amendment, the
Lease shall continue in full force and effect, as written.

         Lessor and Lessee have signed and delivered this Amendment to Lease as
of the date set forth above.

WITNESSES:                             CARBONNEAU FAMILY LIMITED
                                       PARTNERSHIP

/s/_________________________           By /s/
(Janice K. Hulbert          )             _____________________________________
                                       James T. Carbonneau
                                       Its General Partner
/s/_________________________
(Sandra D. Kopp             )                                            Lessor

                                       ROCKFORD CORPORATION

/s/_________________________           By /s/ David Richards
(Shade Shutters             )            ______________________________________
                                       Its Vice President Information
                                       Technologies

/s/_________________________                                             Lessee
(Lynn Thrower               )

                                       [Notary Stamp - Victoria Lynn Hodson]
                                       /s/
                                       9/29/98<PAGE>   1
                                                                 EXHIBIT 10.13.1

                               AMENDMENT NO. 1 TO
                           LOAN AND SECURITY AGREEMENT

                  This Amendment No. 1 to Loan and Security Agreement (this
"Amendment") is entered into as of this 30th day of December, 1998 (the "First
Amendment Effective Date"), by and between FINOVA CAPITAL CORPORATION, a
Delaware corporation ("Lender"), and ROCKFORD CORPORATION, an Arizona
corporation ("Borrower").

                              W I T N E S S E T H:

                  WHEREAS, BORROWER and Lender entered into a Loan and Security
Agreement dated as of June 20, 1997 (the aforementioned Loan and Security
Agreement collectively the "Loan Agreement"), that evidences a loan from Lender
to Borrower; and

                  WHEREAS, Borrower has asked Lender to modify the Loan
Agreement in accordance with the terms of, and subject to the conditions
contained in, this Amendment and Lender is willing so to amend the Loan
Agreement, upon the terms and conditions set forth herein.

                  NOW, THEREFORE, in consideration of these recitals, the
covenants contained in this Amendment, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
Lender and Borrower agree as follows-,

                  1. Definitions. Unless otherwise defined in this Amendment,
all capitalized terms used herein which are defined in the Loan Agreement have
the same meaning as set forth in the Loan Agreement.

                  2. Loan Agreement. The Loan Agreement is amended as follows:

                           2.1 Section 13. 10. This Section shall be amended to
                  read as follows;

                           Promptly notify Lender in writing of the making of
Capital Expenditures exceeding the amount of Five Hundred Thousand Dollars
($500,000) for any one (1) item or One Million Dollars ($ 1,000,000) in the
aggregate.

                           2.2 Definitions.

                                    2.2.1 Section 18.1 is hereby amended by
adding the following definition:

                                    "Best Buy" means Best Buy Stores, Inc., a
Minnesota corporation.

                                    2.2.2 The definition of Capital Expenditures
                  found in Section 18.1 shall be amended by adding the following
                  at the end of the current definition:
<PAGE>   2
                 and including software capitalized under FASB.

                                    2.2.3 The definition of Eligible Receivables
                  found in Section 18.1 shall be amended and restated in its
                  entirety to read as follows:

                                    "Eligible Receivables" means Receivables
                  which Lender, in its sole judgment, shall deem eligible based
                  on such considerations as Lender may from time to time deem
                  appropriate. Without limiting the foregoing, a Receivable
                  shall not be deemed to be an Eligible Receivable if (i) the
                  account debtor has failed to pay the Receivable within a
                  period of one hundred and twenty (120) days after invoice
                  date, to the extent of any amount remaining unpaid after such
                  period; (ii) the account debtor has failed to pay more than
                  twenty-five percent (25.0%) of all outstanding Receivables
                  owed by it to Borrower within one hundred and twenty (120)
                  days after invoice date; (iii) the account debtor is an
                  Affiliate of Borrower; (iv) the goods relating thereto are
                  placed on consignment, guaranteed sale, "bill and hold" or
                  other terms pursuant to which payment by the account debtor
                  may be conditional; (v) the account debtor is not located in
                  the United States or Canada, unless the Receivable is
                  supported by foreign credit 'insurance, a letter of credit or
                  other form of guaranty or security, in each case in form and
                  substance satisfactory to, and in the possession of, Lender;
                  (vi) the account debtor is the United States or any
                  department, agency or instrumentality thereof (unless such
                  Receivable is subject to Lender's first priority security
                  interest and is otherwise properly assigned to Lender pursuant
                  to the Assignment of Claims Act of 1940, 31 U.S.C. Section
                  3727 et sEq., as amended), or any State, city or municipality
                  of the United States; (vii) Borrower is or may become liable
                  to the account debtor for goods sold or services rendered by
                  the account debtor to Borrower; (viii) the account debtor's
                  total obligations to Borrower exceed fifteen percent (15.0%)
                  of all Eligible Receivables, to the extent of such excess,
                  however, for so long as Best Buy maintains a Dun & Bradstreet
                  rating of at least 5A2, the total obligations of Best Buy can
                  constitute up to twenty-five percent (25%) of all Eligible
                  Receivables except during the months of February and March
                  1999 when such accounts can constitute up to thirty percent
                  (30%) of all Eligible Receivables; (ix) the account debtor
                  disputes liability or makes any claim with respect thereto (up
                  to the amount of such liability or claim), or is subject to
                  any insolvency or bankruptcy proceeding, or becomes insolvent,
                  fails or goes out of a material portion of its business; (x)
                  the amount thereof consists of late charges or finance
                  charges; (xi) the face amount thereof exceeds $100,000, unless
                  accompanied by evidence of shipment of the goods relating
                  thereto satisfactory to Lender in its sole discretion; or
                  (xii) the Receivable is a "cash on delivery" (or "C.O.D.")
                  account.

                                      -2-
<PAGE>   3
                  3. Schedule.

                  3.1 The Section of the Schedule to the Loan Agreement entitled
         "Loans" is shall be amended in the following respects:

                                    3.1.1 The definition of Receivables Loans is
                           amended and restated in its entirety to read as
                           follows:

                                    RECEIVABLES LOANS: A revolving line of
                  credit consisting of loans against Borrower's Eligible
                  Receivables ("Receivable Loans") in an aggregate outstanding
                  principal amount not to exceed the lesser of:

                                    (a)     the total of.

                                            (i) the Total Facility

                                            (ii) the aggregate outstanding and
                                            unpaid principal balance of all
                                            Inventory Loans; minus

                                            (iii) the outstanding and unpaid
                                            principal balance of Term Loan A;
                                            minus

                                            (iv) the aggregate outstanding and
                                            unpaid balance of all Capex Loans;
                                            minus

                                            (v) the aggregate sum of the
                                            outstanding and unpaid principal
                                            balance of all Senior Notes on and
                                            after October 10, 1997;
                                    or

                                    (b)     the total of:

                                            (i) an amount equal to eighty-five
                                            percent (85%) of the net amount of
                                            the Eligible Receivables (after
                                            first deducting from such Eligible
                                            Receivables a dilution reserve to
                                            account for dilution 'in excess of
                                            five percent (5%) to be established
                                            at Lender's sole discretion and to
                                            be adjusted quarterly at Lender's
                                            sole discretion on a trailing
                                            twelve-month basis); minus

                                            (ii) the aggregate sum of the
                                            outstanding and unpaid principal
                                            balance of all Senior Notes on and
                                            after October 10, 1997.

                                    Lender may change the applicable advance
                                    rate set forth above from time to time in
                                    its sole discretion.

                                      -3-
<PAGE>   4
                                    3.1.2. The definition of Inventory Loans and
                  Seasonal Loans is amended and restated in its entirety to read
                  as follows:

                  INVENTORY LOANS AND SEASONAL LOANS: A revolving line of credit
                  consisting of loans against Borrower's Eligible Inventory in
                  an aggregate outstanding principal amount not to exceed the
                  lesser of

                  (a)      the amount of Six Million and No/l 00 Dollars
(S6,000,000.00); or

                  (b)      (i) the sum of:

                                    (A) fifty percent (50,0%) of the value of
                           Borrower's Eligible Raw Materials Inventory; plus

                                    (B) sixty-five percent (65,0%) of the value
                           of Borrower's Eligible U.S. Finished Goods Inventory
                           (as such term has been amended by Paragraph 3.7 of
                           this Amendment); plus

                                    (C) the lesser of (1) sixty-five percent
                           (65.0%) of the value of Borrower's Eligible Foreign
                           Finished Goods Inventory, or (2) the amount of Two
                           Million One Hundred Thousand and No/100 Dollars
                           ($2,100,000,00); or

                           (ii) during the four consecutive calendar months of
                  November through February, the sum of:

                                    (A) an additional ten percent (10.0%), over
                           and above the provisions of paragraph (b)(i)(A) and
                           paragraph (b)(i)(B) above, of the value of each of
                           Borrower's Eligible Raw Materials Inventory and
                           Borrower's Eligible U.S. Finished Goods Inventory,
                           respectively; plus

                                    (B) the lesser of (i) an additional ten
                           percent (10.0%), over and above the provisions of
                           paragraph (b)(1)(C)(1) above, of the value of
                           Borrowers Eligible Foreign Finished Goods Inventory,
                           or (fi) any positive amount obtained by subtracting
                           the value of sixty-five percent (65.0%) of the value
                           of Borrower's Eligible Foreign Finished Goods
                           Inventory, from Two Million One Hundred Thousand and
                           NO/100 Dollars ($2, 100,000.00).

                  The value of Borrower's Eligible Inventory shall in all
                  instances be calculated at the lower of cost or market value
                  and determined on a first-in, first-out basis. Lender may
                  change the applicable advance rate set forth above from time
                  to time in its sole discretion.

                  Loans advanced pursuant to paragraph (b)(i) above are herein
                  called the "Inventory Loam." Loans advanced pursuant to
                  paragraph (b)(ii) above are herein

                                      -4-
<PAGE>   5
                  called the "Seasonal Loans." The Inventory Loans, Seasonal
                  Loans and Receivables Loans are herein called the "Revolving
                  Loans."

                  3.2 The Section of the Schedule entitled "Negative Covenants"
         shall be amended in the following respects,

                           3.2.1 The definition of Capital Expenditures shall be
                  amended and restated in its entirety to read as follows:

                           Borrower shall not make or incur any Capital
                           Expenditure (exclusive of (i) Capital Expenditures
                           financed solely by one or more Capex Loans and (ii)
                           the Equipment Lease Termination Advance) if, after
                           giving effect thereto, the aggregate amount of all
                           such Capital Expenditures by Borrower in any fiscal
                           year would exceed the sum of (a) Three Million and
                           No/100 Dollars ($3,000,000.00) plus (b) from and
                           after the first (1st) anniversary of the date hereof
                           but before the third anniversary of the date hereof,
                           purchase money Indebtedness, Capital Lease
                           expenditures and so-called "off-balance sheet"
                           obligations with respect to Equipment financing
                           (collectively, "Financed Capex") in the aggregate
                           amount of Two Million and No/100 Dollars
                           ($2,000,000.00). However, with respect to the 1998
                           and 1999 fiscal years of the Borrower only, the
                           Lender consents to the Borrower entering into a
                           manufacturing equipment capital lease transaction
                           with Bank One (the "Bank One Lease") in an aggregate
                           amount not to exceed $2,000,000.00. The "Equipment
                           Lease Termination Advance" means the advance that was
                           made at the June 20, 1997 Closing under the Loan
                           Agreement in full and complete satisfaction of
                           Borrower's Equipment leases with First Interstate
                           Bank of Arizona, N.A. and its successors-in-interest
                           in the approximate aggregate amount of $562,904
                           covering Equipment identified in UCC File Nos. 861145
                           & 890606, filed with the Arizona Secretary of State
                           on January 3, 1996 and March 267 1996, respectively,
                           and UCC File No. D079670, filed with the Michigan
                           Secretary of State on April 1, 1996. Borrower shall
                           give Lender not less than thirty (30) days written
                           notice of any proposed Financed Capex expenditure.

                           3.2.2 The definition of Subsidiaries shall be amended
                  by adding the following at the end of the current definition:

                                    Notwithstanding the foregoing, Borrower
                                    shall have the right, subject to the Lendees
                                    prior written approval, to create a
                                    Subsidiary in Canada.

                           3.2.3 The definition of Indebtedness shall be amended
                  and replaced in its entirety with the following:

                                      -5-
<PAGE>   6
                                    Borrower shall not create, incur, assume or
                                    permit to exist any Indebtedness (including
                                    Indebtedness in connection with Capital
                                    Leases), other than (i) from and after the
                                    first (1st) anniversary of the date hereof
                                    but before the third anniversary of the date
                                    hereof, no more than the amount of Two
                                    Million and No/100 ($2,000,000) per fiscal
                                    year of Borrower solely in connection with
                                    permitted Financed Capex expenditures as
                                    more fully described 'in the paragraph
                                    labeled "Capital Expenditures" in this
                                    Section 14, (ii) the Obligations, (iii)
                                    trade payables and other contractual
                                    obligations to suppliers and customers
                                    incur-red in the ordinary course of business
                                    (iv) other Indebtedness existing on the date
                                    of this Agreement and reflected in the
                                    Prepared Financials (other than Indebtedness
                                    paid on the date of this Agreement from
                                    proceeds of the initial advances hereunder);
                                    and (v) for the 1998 fiscal year of Borrower
                                    only, the Bank One Lease.

                  3.3 The Section of the Schedule entitled "Term" is amended
         arid restated in its entirety and replaced with the following:

                           The initial term of this Agreement shall be commenced
                           on June 20, 1997 and shall expire on June 19, 2001
                           (the "Initial Term") and shall be automatically
                           renewed at the discretion of Lender for successive
                           periods of one (1) year each (each, a "Renewal
                           Term"), unless earlier terminated as provided in
                           Section 16 or 17 above or elsewhere in this
                           Agreement.

                           Upon the expiration of the Initial Term (if not
                           renewed) or any Renewal Term (if not renewed), or the
                           earlier termination of this Agreement as provided in
                           Section 16 or 17 above or elsewhere in this
                           Agreement, all Obligations shall be immediately due
                           and payable.

                  3.4 The Section of the Schedule entitled "Termination Fee" is
         amended and restated in its entirety and replaced with the following:

                           The Termination Fee provided in Section 16.4 shall
                           be, with respect to the Revolving Loans, an amount
                           equal to the following percentage of the average
                           daily outstanding balance of the Obligations for the
                           180-day period (or lesser period if applicable)
                           preceding the date of termination, and with respect
                           to the Term Loans, an amount equal to the following
                           percentage of the principal amount of such Term Loans
                           prepaid:

                                    (1)      three percent (3%), if such early
                                             termination occurs on or prior to
                                             June 19, 1999;

                                    (ii)     two percent (2%), if such early
                                             termination occurs after June 20,
                                             1998 but on or prior to June 19,
                                             1999;

                                      -6-
<PAGE>   7
                                    (iii)    one percent (1%), if such early
                                             termination occurs after June 20,
                                             1999, but on or prior to June 19,
                                             2000; and

                                    (1v)     one-half percent (.5%), if such
                                             early termination occurs after June
                                             20, 2000.

                             Notwithstanding the foregoing, in the event that
                             such termination and prepayment is financed by
                             Borrower's concluding a successful initial public
                             offering, then the Termination Fee under paragraph
                             (a)(i) above shall be one percent (1%), and under
                             paragraphs (a)(ii), (a)(iii) and (a)(iv) shall be
                             zero percent (0%).

                           3.5 In addition to the locations set forth in the
         Schedule, the Borrower may maintain Inventory at c/o Korbon Trading
         Ltd., 6800 Kitimat Road, Units 19 and 20, Mississauga, Ontario, L5N 5M1
         (the "Canadian Location"). All Inventory located in the Canadian
         Location and all Receivables associated with the sale of such Inventory
         are collectively called the "Canadian Collateral," The Canadian
         Collateral constitutes part of the Collateral to which the Borrower
         has, pursuant to the Loan Documents, granted to the Lender a lien and
         security interest subject only to the Permitted Encumbrances. The
         Borrower reaffirms the foregoing grant to the Lender:

                           3.6 The Section of the Schedule entitled "Borrower
         Information" shall be amended to include the Canadian Location as a
         Borrower Location.

                           3.7 The Section of the Schedule entitled "Additional
         Definitions" shall be amended so that the definition of "Eligible U.S.
         Finished Goods Inventory" shall now be read to include the Finished
         Goods Inventory located at the Canadian Location.

                  4. Amendment Fee. In consideration of Lender's agreement to
enter into this Amendment and to the modification to the Loan Documents
described herein, Borrower agrees to pay on or before the First Amendment
Effective Date the amount of EIGHT THOUSAND FIVE HUNDRED DOLLARS ($8,500) (the
"Amendment Fee").

                  5. Effect as an Amendment. Other than as specifically set
forth in this Amendment, the remaining terms of the Loan Agreement and the other
Loan Documents shall remain in full force and effect and shall remain unaffected
and unchanged except as specifically amended hereby. In the event of any
conflict between the terms and conditions of this Amendment and any of the other
Loan Documents, the provisions of this Amendment shall control. Each reference
to in the Loan Agreement to "this Agreement" shall be deemed to refer to the
Loan Agreement as amended through and including this Amendment, and each
reference in any other Loan Document to the Loan Agreement as amended through
and including this Amendment.

                  6. No Waiver. This Amendment in no way acts as a waiver by
Lender of any breach, default, Event of Default or condition which, with the
giving of notice or passing of time or both, would constitute an Event of
Default, of Borrower (whether known or unknown to

                                      -7-
<PAGE>   8
Lender) or as a release or relinquishment of any of the liens, security
interests, rights or remedies securing payment and performance of the
Obligations or the enforcement thereof Nothing contained in this Amendment is
intended to or shall be construed as relieving any person or entity, whether a
party to this Amendment or not, of any of such person's or entity's obligations
to Lender.

                  7. Conditions Precedent. This Amendment will not be effective
unless and until each of the following conditions precedent have been satisfied,
in form, manner and substance satisfactory to Lender prior to the First
Amendment Effective Date:

                           (a) Borrower shall have delivered or caused to be
         delivered to Lender the following documents, all of which shall be
         properly completed, executed and otherwise satisfactory to Lender:

                                    (i) This Amendment;

                                    (ii) Consent of Guarantors in the form
                  attached hereto and incorporated herein by this reference;

                                    (iii) A corporate resolution and good
                  standing certificates of each of Borrower and Guarantor,
                  approving the transactions contemplated hereby to which it is
                  a party;

                                    (iv) Lender receiving from the lessor of the
                  Canadian location executed Landlord's Waiver and Consent in
                  form and substance satisfactory to Lender;

                                    (v) Lender shall have received searches
                  reflecting the filing of its financing statements and fixture
                  filings for the Canadian Collateral in such jurisdictions as
                  it shall determine, and shall have received certificates of
                  title with respect to the Canadian Collateral which shall have
                  been duly executed in a manner sufficient to perfect all of
                  the security interests granted to Lender;

                                    (vi) Lender shall have received an opinion
                  of Lender's special Canadian counsel covering all such matters
                  as Lender shall determine in its sole discretion;

                                    (vii) Such other items as Lender may
                  reasonably require or reasonably deem necessary; and

                                    (viii) The Amendment Fee.

                           (b) There shall not then exist an Event of Default or
         any act or event which with notice, passage of time, or both would
         constitute an Event of Default.

                                      -8-
<PAGE>   9
                           (c) All the representations and warranties of each
         and every Loan Party shall be true and correct, in all material
         respects, before and after giving effect to the making of this
         Amendment.

                           (d) Borrower shall have paid all closing costs,
         recording fees and taxes, appraisal fees and expenses, travel expenses,
         fees and expenses of Lender's counsel, and all other costs and expenses
         incurred by Lender in connection with The preparation of, closing of
         and disbursement of the advances pursuant to this Amendment, which
         costs, fees and expenses may be payable from the first advance made
         pursuant to this Amendment.

                  8. Indebtedness Acknowledged. Borrower acknowledges that the
indebtedness evidenced by the Loan Documents is just and owing and agrees to pay
such 'indebtedness in accordance with the terms of the Loan Documents. Borrower
further acknowledges and represents that no event has occurred and no condition
presently exists that would constitute a default or event of default by Lender
under the Loan Agreement or any of the other Loan Documents, with or without
notice or lapse of time.

                  9. Validity of Documents. Borrower hereby ratifies, reaffirms,
acknowledges and agrees that the Loan Agreement and the other Loan Documents
represent valid, enforceable and collectable obligations of Borrower, and that
Borrower presently has no existing claims, defenses (personal or otherwise) or
rights of setoff whatsoever with respect to the Obligations of Borrower under
the Loan Agreement or any of the other Loan Documents. Borrower furthermore
agrees that it has -no defense, counterclaim, offset, cross-complaint, claim or
demand of any nature whatsoever which can be asserted as a basis to seek
affirmative relief or damages from Lender.

                  10. Reaffirmation of Warranties. Borrower hereby reaffirms to
Lender each of the representations, warranties, covenants and agreements of
Borrower as set forth in each of the Loan Documents with the same force and
effect as if each were separately stated herein and made as of the date hereof.
Borrower represents and warrants to Lender that with respect to the financing
transaction herein contemplated, no Person is entitled to any brokerage fee or
other commission and Borrower agrees to indemnify and hold Lender harmless
against any and all such claims.

                  11. Other Writings. Lender and Borrower will execute such
other writings as may be necessary to confirm or carry out the intentions of
Lender and Borrower evidenced by this Amendment.

                  12. Entire Agreement. The Loan Documents as modified by this
Amendment embody the entire agreement and understanding between Borrower and
Lender, and supersede all prior agreements and understandings between said
par-ties relating to the subject matter thereof

                  13. Counterparts; Telefacsimile Execution. This Amendment
(including the consents attached hereto) may be executed 'in any number of
separate counterparts, all of which

                                      -9-
<PAGE>   10
when taken together shall constitute one and the same *instrument, admissible
into evidence, notwithstanding the fact that all parties have not signed the
same counterpart. Delivery of an executed counterpart of this Amendment by
telefacsimile shall be equally as effective as delivery of a manually executed
counterpart of this Amendment. Any party delivering an executed counterpart of
this Amendment by telefacsimile shall also deliver a manually executed
counterpart of this Amendment, but the failure to deliver a manually executed
counterpart shall not affect the validity, enforceability, and biding effect of
this Amendment.

                            [SIGNATURE PAGE FOLLOWS]

                                      -10-
<PAGE>   11
                       IN WITNESS WHEREOF, the parties hereto have caused this
      Amendment to be duly executed as of the day and year first written above.

                                       FINOVA CAPITAL CORPORATION, a Delaware
                                       corporation

                                       By:     /s/
                                          -------------------------------------
                                       Name:  M. S. Milam
                                       Title:  V.P.

                                       ROCKFORD CAPITAL CORPORATION, an Arizona
                                       Corporation

                                       By:     /s/
                                          -------------------------------------
                                       Name:    Vice President Finance & CFO
                                            -----------------------------------
                                       Title:     James M. Thomson
                                             ----------------------------------

                                      -11-
<PAGE>   12
                              CONSENT OF GUARANTOR

                  The undersigned ("Guarantor") hereby executes this Consent for
the purpose of (i) evidencing Guarantor's consent to the execution and
performance of the foregoing Amendment No. I to Loan and Security Agreement (the
"First Amendment") by Lender and Borrower, (ii) reaffirming the terms of the
Continuing Guaranty Agreement executed by Guarantor in favor of Lender, (iii)
evidencing Guarantor's agreement that the Liabilities as set forth and defined
in the Continuing Guaranty Agreement shall, for all purposes, include the Loan
'Documents, as amended by the First Amendment, and shall further include all
additional amounts which may be funded or advanced to Borrower pursuant to the
Loan Agreement described above as amended by the First Amendment, and (iv)
ratifying and affirming all terms and provisions of the Continuing Guaranty
Agreement. Except to the extent otherwise indicated, terms used herein with
initial capital letters shall have the meanings set forth in the Loan Agreement,
as amended by the First Amendment.

                  Guarantor agrees that it has no defense, counterclaim, offset,
cross-complaint, claim or demand of any nature whatsoever which can be asserted
as a basis to seek affirmative relief or damages from Lender,

                  IN WITNESS WHEREOF, the undersigned has hereunto executed this
Consent as of This 30 day of December , 1998.

                                  ROCKFORD EUROPE ELEKTRONIK,
                                  VERTRIEBS, GmBH, a German Limited Liability
                                  Corporation

                                  By:    /s/
                                     ------------------------------------------
                                  Name:   James M. Thomson
                                        ---------------------------------------
                                  Title:    Vice President-Finance & CFO
                                        ---------------------------------------

                                      -12-
<PAGE>   13
                              CONSENT OF GUARANTOR

                  The undersigned ("Guarantor") hereby executes this Consent for
the purpose of (i) evidencing Guarantor's consent to the execution and
performance of the foregoing Amendment No. 1 to Loan and Security Agreement (the
"First Amendment") by Lender and Borrower, (ii) reaffirming the terms of the
Continuing Guaranty Agreement executed by Guarantor in favor of Lender, (iii)
evidencing Guarantor's agreement that the Liabilities as set forth and defined
in the Continuing Guaranty Agreement shall, for all purposes, include the Loan
Documents, as amended by the First Amendment, and shall further include all
additional amounts which may be funded or advanced to Borrower pursuant to the
Loan Agreement described above as amended by the First Amendment, and (iv)
ratifying and affirming all terms and provisions of the Continuing Guaranty
Agreement. Except to the extent otherwise indicated, terms used herein with
initial capital letters shall have the meanings set forth in the Loan Agreement,
as amended by the First Amendment.

                  Guarantor agrees that it has no defense, counterclaim, offset,
cross-complaint, claim or demand of any nature whatsoever which can be asserted
as a basis to seek affirmative relief or damages from Lender.

                  IN WITNESS WHEREOF, the undersigned has hereunto executed this
Consent as of This 30 day of December , 1998.

                                  ROCKFORD JAPAN CORPORATION, a Japanese\
                                  corporation

                                  By:    /s/
                                      -----------------------------------------
                                  Name:   James M. Thomson
                                       ----------------------------------------
                                  Title:    Vice President-Finance & CFO
                                       ----------------------------------------

                                      -13-
<PAGE>   14
                              CONSENT OF GUARANTOR

                  The undersigned ("Guarantor") hereby executes this Consent for
the purpose of (i) evidencing Guarantor's consent to the execution and
performance of the foregoing Amendment No. I to Loan and Security Agreement (the
"First Amendment") by Lender and Borrower, (ii) reaffirming the terms of the
Continuing Guaranty Agreement executed by Guarantor in favor of Lender, (iii)
evidencing Guarantor's agreement that the Liabilities as set forth and defined
in the Continuing Guaranty Agreement shall, for all purposes, include the Loan
Documents, as amended by the First Amendment, and shall further include all
additional amounts which may be funded or advanced to Borrower pursuant to the
Loan Agreement described above as amended by the First Amendment, and (iv)
ratifying and affirming all terms and provisions of the Continuing Guaranty
Agreement. Except to the extent otherwise indicated, terms used herein with
initial capital letters shall have the meanings set forth in the Loan Agreement,
as amended by the First Amendment.

                  Guarantor agrees that it has no defense, counterclaim, offset,
cross-complaint, claim or demand of any nature whatsoever which can be asserted
as a basis to seek affirmative relief or damages from Lender.

                  IN WITNESS WHEREOF, the undersigned has hereunto executed this
Consent as of This 30 day of December , 1998.

                                  ROCKFORD SINGAPORE CORPORATION, an Arizona
                                  corporation

                                  By:    /s/
                                     ------------------------------------------
                                  Name:   James M. Thomson
                                       ----------------------------------------
                                  Title:    Vice President-Finance & CFO
                                        ---------------------------------------

                                      -14-

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