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                                                                   Exhibit 10.10

                                                                [EXECUTION COPY]

                      EXECUTIVE STOCK PURCHASE AGREEMENT

            This Agreement is dated as of April 28, 2000 by and among Knowles
Electronics Holdings, Inc., a Delaware corporation (the "Company"), James F.
Brace (the "Executive"), and Key Acquisition, L.L.C., a Delaware limited
liability company (the "Investor").

            The Company and the Executive desire to enter into this Agreement to
provide for the acquisition by the Executive from the Company of the number of
shares of Class A Common Stock, par value $.OO1 per share (the "Stock") set
forth opposite such Executive's name on the attached Schedule A.

            The Investor has purchased certain shares of the Company's preferred
and common stock, on the understanding that the Company and each executive
purchasing Common Stock (including the Executive) enter into an agreement
containing the terms of this Agreement. Certain provisions of this Agreement are
intended for the benefit of, and will be enforceable by, the Investor.

            NOW, THEREFORE, the parties hereto agree as follows:

      1.    Definitions. As used herein, the following terms shall have the
            following meanings.

            "Board" means the Company's board of directors.

            "Business Day" means any day other than a Saturday or Sunday or a
day on which commercial banks are required or authorized to close in Chicago,
Illinois.

            "Cause" means (i) a willful and material breach of Section 7 or
Section 8 of this Agreement by the Executive which results in harm to the
Company or benefit to the Executive or others; (ii) the commission by the
Executive of a non-traffic felony, a crime involving theft or dishonesty which
in the reasonable determination of the Board is likely to cause material harm
to, or to the standing and reputation of, the Company or its Subsidiaries; (iii)
gross negligence in the performance of the Executive's duties to the Company and
its Subsidiaries; (iv) the Executive's willful failure to comply with or
disregard of the reasonable directives of the Board (provided, that performance
in accordance with such directives does not constitute a change in the terms of
the Executive's employment) or violation of any statutory or common law duty of
loyalty to the Company; or (v) any material knowing misrepresentation or
material knowing non-disclosure by the Executive to the Board.

            "Committee" means the Compensation Committee established by the
Board.

            "Common Stock" means the Class A Common Stock of the Company, as
adjusted for any stock split, stock dividend, share combination, share exchange,
recapitalization, merger, consolidation or other reorganization.

            "Executive Stock" means (i) the Stock issued to the Executive
pursuant to this Agreement and (ii) all securities issued or issuable directly
or indirectly with respect to the securities


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                                                                [EXECUTION COPY]

referred to in clause (i) above by way of a stock dividend or stock split or in
connection with a combination of shares, recapitalization, merger, consolidation
or other reorganization. Executive Stock shall continue to be Executive Stock in
the hands of any holder other than the Executive (except for the Company, the
Investor and purchasers in a Public Sale or a Sale of the Company), and each
such transferee thereof shall succeed to the rights and obligations of a holder
of Executive Stock hereunder. As to any particular Executive Stock, such
securities shall cease to be Executive Stock when they have been repurchased by
the Company or the Investor, sold in a Public Sale or pursuant to a Sale of the
Company.

            "Fair Market Value" with respect to any Common Stock means the
average of the closing prices of the sales of such Common Stock on all
securities exchanges on which such Common Stock may at the time be listed, or,
if there have been no sales on any such exchange on any day, the average of the
highest bid and lowest asked prices on all such exchanges at the end of such
day, or, if on any day such Common Stock is not so listed, the average of the
representative bid and asked prices quoted in the Nasdaq Stock Market ("Nasdaq
System") as of 4:00 P.M., New York time, or, if on any day such Common Stock is
not quoted in the Nasdaq System, the average of the highest bid and lowest asked
prices on such day in the domestic over-the-counter market as reported by the
National Quotation Bureau Incorporated, or any similar successor organization,
in each such case averaged over a period of 21 days consisting of the day as of
which the Fair Market Value is being determined and the 20 consecutive Business
Days prior to such day. If at any time such Common Stock is not listed on any
securities exchange or quoted in the Nasdaq System or the over-the-counter
market, the Fair Market Value shall be the fair value of such Common Stock
determined in good faith by the Board based on the value of the Company as a
going concern (without taking into account any illiquidity or minority
discounts, or the effect of any contemporaneous repurchase of Common Stock).


            "Good Reason" means, without the Executive's prior written consent,
the occurrence of any of the following events which is not cured by the Company
within 15 days after receipt of notice from the Executive: (i) the Executive's
base salary is reduced; (ii) Executive's benefits under any benefit plan or
bonus plan are materially reduced (unless such reduction is part of a plan or
program implementing a general reduction in such benefits for all of the
Company's senior executives or unless reasonably comparable benefits are
substituted); (iii) the Executive's principal place of employment is relocated
by more than 25 miles or the assignment of duties to the Executive will
reasonably require such relocation; or (iv) there is a material reduction or
other material adverse change in the nature or scope of the Executive's duties,
responsibilities or authority.

            "Permanent Disability" means the Executive is unable to perform, by
reason of physical or mental incapacity, his then duties or obligations to the
Company and its Subsidiaries, for a period of 30 consecutive days or a total
period of 60 days in any 360-day period.

            "Person" means an individual, a partnership, a corporation, a
limited liability company, an association, a joint stock company, a trust, a
joint venture, an unincorporated organization or any


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                                                                [EXECUTION COPY]

other entity, including a governmental entity or any department, agency or
political subdivision thereof.

            "Public Sale" means any sale pursuant to a registered public
offering under the Securities Act or any sale to the public pursuant to Rule 144
or Rule 144A promulgated under the Securities Act effected through a broker,
dealer or market maker.

            "Registration Rights Agreement" means the Registration Rights
Agreement, dated as of June 30, 1999, by and among the Company, the Investor and
certain other Persons signatory thereto, as in effect from time to time.

            "Sale of the Company" means the sale or disposition of the Company,
in a single transaction or a series of related transactions, to one or more
Persons who are not affiliates of any of the parties to the Stockholders
Agreement as in effect on the date hereof, pursuant to which any Person or group
of associated or related Persons acquire a majority of the outstanding Common
Stock or all or substantially all of the consolidated assets of the Company and
its Subsidiaries (including by merger, consolidation, recapitalization,
reorganization, or otherwise).

            "Securities Act" means the Securities Act of 1933, as amended from
time to time.

            "Stockholders Agreement" means the Stockholders Agreement, dated as
of June 30, 1999, by and among the Company, the Investor and certain other
Persons signatory thereto, as in effect from time to time.

            "Subsidiary" means, with respect to any Person, any Person of which
(i) if a corporation, a majority of the total voting power of shares of stock
entitled (without regard to the occurrence of any contingency) to vote in the
election of directors, managers or trustees thereof is at the time owned or
controlled, directly or indirectly, by that Person or one or more of the other
Subsidiaries of that Person or a combination thereof, or (ii) if a partnership,
association or other business entity, a majority of the partnership, membership
or other similar ownership interests thereof is at the time owned or controlled,
directly or indirectly, by that Person or one or more Subsidiaries of that
Person or a combination thereof. For purposes hereof, a Person or Persons shall
be deemed to have a majority ownership interest in another Person if such
Person or Persons shall be allocated a majority of the gains or losses of or
shall be or control the managing member or a general partner of such other
Person.

            "Transfer" means a sale, transfer, assignment or other disposition
(whether with or without consideration and whether voluntarily or involuntarily
or by operation of law) of any interest in any shares of Executive Stock.

      2. Purchase and Sale of Executive Stock; Representations and Warranties of
the Executive.


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                                                                [EXECUTION COPY]

            (a) Upon execution of this Agreement, the Executive will purchase,
and the Company will sell to the Executive the Stock for a total purchase price
as set forth opposite the Executive's name on the attached Schedule A (the
"Purchase Price"). The Company will deliver to the Executive certificates
representing such securities free and clear of all liens and encumbrances; and,
on the date hereof, the Executive will deliver to the Company (or its designee)
the Purchase Price by certified check or wire transfer of immediately available
funds.

            (b) Upon execution of this Agreement, the Executive shall execute
and deliver a joinder to each of the Stockholders Agreement and the Registration
Rights Agreement.

            (c) Within 30 days after Executive purchases the Executive Stock,
Executive shall make an effective election with the Internal Revenue Service
under Section 83(b) of the Internal Revenue Code and the regulations promulgated
thereunder in the form of Exhibit A attached hereto.

            (d) In connection with the purchase and sale of the Executive Stock
hereunder, the Executive represents and warrants to the Company that:

                  (i) The Executive Stock to be acquired by the Executive
pursuant to this Agreement will be acquired for the Executive's own account and
not with a view to, or any present intention of, distribution thereof in
violation of the Securities Act, or any applicable state securities laws, and
the Executive Stock will not be disposed of in contravention of the Securities
Act or any applicable state securities laws.

                  (ii) No commission, fee or other remuneration is to be paid
or given, directly or indirectly, to any Person for soliciting the Executive to
purchase the Executive Stock.

                  (iii) The Executive is an officer or employee of the Company
or one of its Subsidiaries, is sufficiently sophisticated in financial matters
to analyze the investment in the Executive Stock, is able to evaluate the risks
and benefits of the investment in the Executive Stock, and has determined that
such investment in the Executive Stock is suitable for the Executive, based upon
the Executive's financial situation and needs, as well as the Executive's other
securities holdings.

                  (iv) The Executive:

                        (A) has not been convicted within the last five years of
any felony or misdemeanor in connection with the offer, purchase, or sale of any
security or any felony involving fraud or deceit, including, but not limited to,
forgery, embezzlement, obtaining money under false pretenses, larceny, or
conspiracy to defraud;

                        (B) is not currently subject to any state administrative
enforcement order or judgment entered by a state securities administrator within
the last five years or is subject to any state's administrative enforcement
order or judgment in which fraud or deceit, including, but


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                                                               [EXECUTION COPY]

not limited to, making untrue statements of material facts and omitting to state
material facts, was found and the order or judgment was entered within the last
five years;

                        (C) is not subject to any state's administrative
enforcement order or judgment which prohibits, denies or revokes the use of any
exemption from registration in connection with the offer, purchase or sale of
securities; or

                        (D) is not currently subject to any order, judgment or
decree of any court of competent jurisdiction, entered within the last five
years, temporarily or preliminarily restraining or enjoining the Executive from
engaging in or continuing any conduct or practice in connection with the
purchase or sale of any security or involving the making of any false filing
with the state.

                  (v) On the date hereof, the Executive is able to bear the
economic risk of the Executive's investment in the Executive Stock for an
indefinite period of time and the Executive understands that the Executive Stock
have not been registered under the Securities Act and cannot be sold unless
subsequently registered under the Securities Act or an exemption from such
registration is available.

                  (vi) The Executive has had an opportunity to ask questions and
receive answers concerning the terms and conditions of the offering of Executive
Stock and has had full access to such other information concerning the Company
as the Executive has requested. The Executive has reviewed, or has had an
opportunity to review, the following documents: (A) the Company's Certificate of
Incorporation and Bylaws; (B) the Credit Agreement, dated as of June 28, 1999
(as may be amended, modified, extended or restated from time to time the "Credit
Agreement"), among the Company, the Lenders party thereto, The Chase Manhattan
Bank, as Administrative Agent for the Lenders thereunder, Morgan Stanley Senior
Funding, Inc., as Syndication Agent and Chase Securities Inc., as Lead Arranger
and Book Manager, the Loan Documents (as defined in the Credit Agreement), the
Note Purchase Agreement, dated as of June 28, 1999 (as may be amended, modified,
extended or restated from time to time the "Note Purchase Agreement"), among the
Company, Morgan Stanley Senior Funding, Inc., as Lead Manager, Book Runner and a
Purchaser and Chase Securities Inc., as Co-Manager and a Purchaser and the Note
Documents (as defined in the Note Purchase Agreement) and (C) all of the
materials provided by the Company to any Person providing financing to the
Company, including, but not limited to, the Company's pro forma balance sheet,
as well as financial projections, estimates, forecasts, budgets, summaries,
reports and other related documents.

                  (vii) This Agreement constitutes the legal, valid and binding
obligation of the Executive, enforceable in accordance with its terms, and the
execution, delivery and performance of this Agreement by the Executive does not
and will not conflict with, violate or cause a breach of any agreement, contract
or instrument to which the Executive is a party or any judgment, order or decree
to which the Executive is subject.


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                                                                [EXECUTION COPY]

            (e) As an inducement to the Company to issue the Executive Stock to
the Executive, and as a condition thereto, the Executive acknowledges and agrees
that:

                  (i) neither the issuance of the Executive Stock to the
Executive nor any provision contained herein shall entitle the Executive to
remain in the employment of the Company and its Subsidiaries or affect the right
of the Company to terminate the Executive's employment at any time for any
reason; and

                  (ii) other than as required by law, (A) the Company shall have
no duty or obligation to disclose to the Executive, and (B) the Executive shall
have no right to be advised of, any material information regarding the Company
and its Subsidiaries at any time prior to, upon or in connection with, the
repurchase of Executive Stock as otherwise provided hereunder.

      3. Vesting. Unless accelerated or as determined by the Committee, the
Executive Stock will vest over a period of 4 years from January 17, 2000 in 4
equal installments, with one-quarter of the number of shares of Executive Stock
vesting as of each of the first through fourth anniversaries of such date during
which the Executive remains employed by the Company; provided, however, that (a)
in the event that the Executive ceases to be employed by the Company and its
Subsidiaries by reason of death, permanent disability, retirement at or after
age 65, termination by the Company without Cause, or voluntary termination by
the Executive with Good Reason (each a "No Fault Termination"), or (b) upon the
occurrence of a Sale of the Company or IPO (as defined in the Registration
Rights Agreement), the Executive Stock will vest immediately; and provided
further, that all Executive Stock not repurchased pursuant to the Call Option
pursuant to Section 4(b) below will vest upon the expiration of the time period
during which the Call Option may be exercised. The shares of Executive Stock
which have vested at any particular time are referred to herein as the "Vested
Stock", and the shares of Executive Stock which have not vested at any
particular time are referred to herein as the "Unvested Stock". The status of
Executive Stock as Vested Stock or Unvested Stock shall have no effect on the
rights of the holder of such Executive Stock pursuant to the Stockholders
Agreement.

      4. Put and Call Options.

            (a) Executive's Put Option

                  (i) Generally. Subject to Section 4(b)(v), in the event of a
No Fault Termination, all of the Vested Stock (whether held by the Executive or
any other Person) will be subject to repurchase by the Company, at the option of
the Executive or his estate, pursuant to the terms and conditions set forth in
this Section 4(a) (the "Put Option").

                  (ii) Put Price. Upon exercise of the Put Option, the purchase
price for the Vested Stock shall be its Fair Market Value.


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                                                                [EXECUTION COPY]

                  (iii) Put Exercise. The Executive may elect to have the
Company purchase any or all of the Vested Stock by delivering written notice
(the "Put Notice") to the Company within 60 days after the date of No Fault
Termination. The Put Notice will set forth the time and place for the closing of
such purchase.

            (b) Company's Call Option.

                  (i) Generally. In the event that the Executive ceases to be
employed by the Company and its Subsidiaries for any reason other than
retirement at or after age 65, all of the Executive Stock (whether held by the
Executive or any other Person) will be subject to repurchase by the Company or
the Investor (or the Investor's designee(s)) at their option, pursuant to the
terms and conditions set forth in this Section 4(b) (the "Call Option").

                  (ii) Call Price. Upon exercise of the Call Option, the
purchase price for each share of the Executive Stock shall be:

                        (A) in the event of a No Fault Termination, the greater
of (A) its Fair Market Value and (B) its Purchase Price;

                        (B) in the event of termination by the Company for Cause
or voluntary termination by the Executive without Good Reason:

                             (1) for each share of Unvested Stock, the lesser of
(A) its Fair Market Value and (B) its Purchase Price; or

                             (2) for each share of Vested Stock, the greater of
(A) its Fair Market Value and (B) its Purchase Price.

                  (iii) Call Exercise. The Company may elect to purchase any or
all of the Executive Stock by delivering written notice (the "Call Notice") to
the holder(s) of such Executive Stock within 120 days after the date of
termination of the Executive's employment. The Call Notice will set forth the
number of shares of each class of Stock to be acquired, the consideration to be
paid for such shares and the time and place for the closing of such purchase.

                  (iv) Call by Investor. Subject to Section 4(b)(v), to the
extent the Company does not elect to purchase all of the Executive Stock
pursuant to the Call Option, the Investor (or its designee(s)) shall be entitled
to exercise the Call Option for any or all of the balance of the Executive Stock
(the "Available Stock"), to be held for resale to executives of the Company. As
soon as practicable after the Company has determined that there will be
Available Stock, but in any event within 60 days after the date of termination
of the Executive's employment, the Company shall give written notice to the
Investor setting forth the number of shares of Available Stock of each class and
the purchase price for each class of Available Stock.


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                                                              [EXECUTION COPY]

                  (v) Restriction on Call Exercise. Neither the Company nor the
Investor may exercise the Call Option at any time after receipt by the Company
of a Put Notice until such time as the Company has completed the purchase
described in such Put Notice in accordance with the terms of Section 4(a).

            (c) Closing. The closing of any purchase of the Executive Stock
pursuant to the Put Option or the Call Option shall take place on the date
designated by the Executive in the Put Notice, or by the Company in the Call
Notice, which date shall not be more than 60 days nor less than five days after
the delivery of such notice. The Company or the Investor (or the Investor's
designee(s)) will pay for the Executive Stock to be purchased by delivery of a
check or wire transfer of funds. Furthermore, the Company may pay the purchase
price for such shares by offsetting amounts outstanding under any bona fide
debts for borrowed money owed by the Executive to the Company. In connection
with any such repurchase the purchasers of Executive Stock hereunder shall be
entitled to receive from the sellers of Executive Stock customary
representations and warranties regarding ownership, title, and authority to sell
the Executive Stock, and to require all sellers' signatures to be guaranteed.

      5. Restrictions on Transfer. The transfer of the Executive Stock shall be
subject to the terms of the Stockholders Agreement, and the certificates
representing the Executive Stock will bear the legend set forth in Section 12 of
the Stockholders Agreement.

      6. Representations and Warranties of the Company. The Company hereby
represents and warrants to the Executive that:

            (a) The Company is a corporation duly organized, validly existing
and in good standing under the laws of the State of Delaware and is qualified to
do business in every jurisdiction in which its ownership of property or conduct
of business requires it to qualify. The Company has all requisite corporate
power and authority to carry out the transactions contemplated by this
Agreement.

            (b) The execution, delivery and performance of this Agreement has
been duly authorized by the Company. This Agreement constitutes a legal, valid
and binding obligation of the Company, enforceable in accordance with its terms.
The execution and delivery by the Company of this Agreement, the offering, sale
and issuance of the Stock hereunder and the fulfillment of and compliance with
the respective terms hereof by the Company, do not and shall not (i) conflict
with or result in a breach of the terms, conditions or provisions of, (ii)
constitute a default under, (iii) result in the creation of any lien, security
interest, charge or encumbrance upon the Company's capital stock or assets
pursuant to, (iv) give any third party the right to modify, terminate or
accelerate any obligation under, (v) result in a violation of, or (vi) require
any authorization, consent, approval, exemption or other action by or notice to
any court or administrative or governmental body pursuant to, the charter or
bylaws of the Company, or any law, statute, rule or regulation to which the
Company is subject, or any agreement, instrument, order, judgment or decree to
which the Company is subject.


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                                                               [EXECUTION COPY]

            (c) There are no statutory or contractual stockholders preemptive
rights or rights of refusal with respect to the issuance of the Executive Stock
hereunder. The Company has not violated any applicable federal or state
securities laws in connection with the offer, sale or issuance of any of its
capital stock including the Executive Stock, and the offer, sale and issuance of
the Executive Stock hereunder do not require registration under the Securities
Act or any applicable state securities laws. There are no agreements between the
Company's stockholders with respect to the voting, Transfer or registration of
the Company's capital stock or with respect to any other aspect of the Company's
affairs, except for (i) the Stockholders Agreement, (ii) the Registration Rights
Agreement, and (iii) this Agreement.

            (d) All negotiations relative to this Agreement and the transactions
contemplated hereby have been carried out by parties hereto without the
intervention of any other Person in such manner as to give rise to any valid
claim by any Person against the Executive or the Company for a finder's fee,
brokerage commission or similar payment.

      7. Confidentiality and Ownership.

            (a) Information. The Executive acknowledges and agrees that the
proprietary information and data obtained by him while employed by the Company
or any of its Subsidiaries concerning the business or affairs of the Company or
any Subsidiary ("Confidential Information") are the property of the Company or
such Subsidiary. Consequently, the Executive agrees that, except to the extent
required by applicable law, statute, ordinance, rule, regulation or orders of
courts or regulatory authorities, he shall not disclose to any unauthorized
person (which shall not include customers or suppliers to whom information is
provided in the ordinary course in the interests of promoting their business
relationships with the Company or any of its Subsidiaries) or use for his own
account any Confidential Information without the prior written consent of the
Board, unless and to the extent that the aforementioned matters become generally
known to and available for use by the public other than as a result of the
Executive's acts or omissions to act. The Executive shall deliver to the Company
at the termination of the Executive's employment, or at any other time the
Company may request, all memoranda, notes, plans, records, reports, computer
tapes and software and other documents and data (and copies thereof) relating to
the Confidential Information, Work Product (as defined below) and the business
of the Company or any Subsidiary which he may then possess or have under his
control.

            (b) Inventions and Patents. The Executive agrees that all
inventions, innovations, improvements, developments, methods, designs, analyses,
drawings, reports, and all similar or related information which relates to the
Company's or any of its Subsidiaries' actual or anticipated business, research
and development or existing or future products or services and which are
conceived, developed or made by the Executive prior to the date hereof while
employed by the Company or any of its Subsidiaries ("Work Product") belong to
the Company or such Subsidiary. The Executive will promptly disclose such Work
Product to the Board and perform all actions reasonably requested by the Board
(whether during or after the Executive's employment period) to establish and
confirm such


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                                                                [EXECUTION COPY]

ownership (including, without limitation, assignments, consents, powers of
attorney and other instruments).

      8. Non-compete, Non-solicitation.

            (a) The Executive acknowledges that in the course of his employment
with the Company and its Subsidiaries he has become familiar, and he will become
familiar, with the Company's and its Subsidiaries' trade secrets and with other
Confidential Information and that his services have been and will be of special,
unique and extraordinary value to the Company and its Subsidiaries. Therefore,
the Executive agrees that he shall not, during the time he is employed by the
Company and its Subsidiaries and for 24 months thereafter, directly or
indirectly own, operate, manage, control, participate in, consult with, advise,
engage in services for any competitor of the Company or in any manner engage in
any start up of a business (including by himself or in association with any
person, firm, corporate or other business organization or through any other
entity) in competition with the businesses of the Company or its Subsidiaries as
in existence or in process on the date of termination of the Executive's
employment (the "Businesses"), within any state or country in which the Company
or any of its Subsidiaries makes sales. Nothing herein shall prohibit the
Executive from being a passive owner of not more than 2% of the outstanding
stock or equity of a Person which is publicly traded, so long as the Executive
has no active participation in the business of such Person.

            (b) During the time the Executive is employed by the Company and its
Subsidiaries and for 24 months thereafter, the Executive shall not directly or
indirectly through another entity (i) induce or attempt to induce any employee
of the Company or any Subsidiary to leave the employ of the Company or such
Subsidiary, or in any way interfere with the relationship between the Company or
any Subsidiary and any employee thereof, including without limitation, inducing
or attempting to induce any union, employee or group of employees to interfere
with the Business or operations of the Company or its Subsidiaries, (ii) hire
any person who was an employee of the Company or any Subsidiary at any time
within the six month period prior to the date the Executive employs or seeks to
employ such person, or (iii) induce or attempt to induce any supplier,
distributor, franchisee, licensee or other business relation of the Company or
any Subsidiary to cease doing business with the Company or such Subsidiary, or
in any way interfere with the relationship between any such customer, supplier,
distributor, franchisee, licensee or business relation and the Company or any
Subsidiary.

            (c) In the event that the Executive's employment is terminated by
the Company without Cause or voluntarily by the Executive with Good Reason, for
6 months after such termination, the Company shall continue to pay to the
Executive his base salary as in effect at the time of such termination (without
regard to any reduction which provided Good Reason), and the Executive shall
continue to receive normal coverage under the Company's medical plans until the
end of such period or until replacement coverage is provided by any new
employer, whichever occurs sooner; provided, that in the event that the
Executive breaches any provision of this Section 8, the Company shall no longer
be obligated to make any such payments or provide such coverage.

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            (d) The Executive agrees that: (i) the covenants set forth in this
Section 8 are reasonable in geographical and temporal scope and in all other
respects, (ii) the Company would not have entered into this Agreement but for
the covenants of the Executive contained herein, and (iii) the covenants
contained herein have been made in order to induce the Company to enter into
this Agreement.

            (e) If, at the time of enforcement of this Section 8, a court shall
hold that the duration, scope or area restrictions stated herein are
unreasonable under circumstances then existing, the parties agree that the
maximum duration, scope or area reasonable under such circumstances shall be
substituted for the stated duration, scope or area and that the court shall be
allowed to revise the restrictions contained herein to cover the maximum period,
scope and area permitted by law.

            (f) The Executive recognizes and affirms that in the event of his
breach of any provision of this Section 8, money damages would be inadequate and
the Company and the Investor would have no adequate remedy at law. Accordingly,
the Executive agrees that in the event of a breach or a threatened breach by the
Executive of any of the provisions of this Section 8, the Company, in addition
and supplementary to other rights and remedies existing in its favor, may apply
to any court of law or equity of competent jurisdiction for specific performance
and/or injunctive or other relief in order to enforce or prevent any violations
of the provisions hereof (without posting a bond or other security).

      9. Notice. All notices, demands or other communications to be given or
delivered under or by reason of the provisions of this Agreement will be in
writing and will be deemed to have been given when delivered personally, mailed
by certified or registered mail, return receipt requested and postage prepaid,
or sent via a nationally recognized overnight courier, or sent via facsimile to
the recipient with a confirmation of receipt and accompanied by a certified or
registered mailing. Such notices, demands and other communications will be sent
to the address indicated below:


                      Notices to the Company:

                      Knowles Electronics Holdings, Inc.
                      1151 Maplewood Drive
                      Itasca, IL 60143
                      Fax:  (630) 250-0575
                      Attn.: John J. Zei


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                                                               [EXECUTION COPY]

                             with copies (which shall not constitute notice) to:

                             Key Acquisition, L.L.C.
                             c/o Doughty Hanson & Company, Ltd.
                             Times Place
                             45 Pall Hall
                             London SW1Y 5JG
                             Fax: 011-44-171-747-9325
                             Attn.: Ken Terry

                             and (which shall not constitute notice) to:

                             Kirkland & Ellis
                             200 E. Randolph Dr.
                             Chicago, IL 60601
                             Fax: 312-861-2200
                             Attn: E. Paul Quinn


                      To the Investor:

                      Key Acquisition, L.L.C.
                      c/o Doughty Hanson & Company, Ltd.
                      Times Place
                      45 Pall Hall
                      London SW1Y 5JG
                      Fax:  011-44-171-747-9325
                      Attn.: Ken Terry

                             with copies (which shall not constitute notice) to:

                             Kirkland & Ellis
                             200 E. Randolph Dr.
                             Chicago, IL 60601
                             Fax: 312-861-2200
                             Attn: E. Paul Quinn

                      To the Executive:

                      c/o Knowles Electronics Holdings, Inc.
                      1151 Maplewood Drive
                      Itasca, IL 60143
                      Fax:  (630) 250-0575
                      Attn.: James F. Brace


                                      -12-
<PAGE>   13

                                                                [EXECUTION COPY]

or to such other address or to the attention of such other person as the
recipient party has specified by prior written notice to the sending party.

      10. Miscellaneous.

            (a) Covenant of the Company. Without the consent of Persons holding
a majority of the Common Stock held by all executives of the Company (including
the Executive), the Company shall not amend any of the terms of the Series A
Preferred (as defined in the Second Amended and Restated Certificate of
Incorporation of the Company).

            (b) Transfers in Violation of Agreement. Any Transfer or attempted
Transfer of any Executive Stock in violation of any provision of this Agreement
shall be null and void, and the Company shall not record such Transfer on its
books or treat any purported transferee of such Executive Stock as the owner of
such securities for any purpose.

            (c) Severability. Whenever possible, each provision of this
Agreement will be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability will not affect
any other provision or any other jurisdiction, but this Agreement will be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

            (d) Complete Agreement. This Agreement and the agreements referred
to herein embody the complete agreement and understanding among the parties and
supersede and preempt any prior understandings, agreements or representations by
or among the parties, written or oral, which may have related to the subject
matter hereof.

            (e) Waiver of Jury Trial. The parties to this Agreement each hereby
waives, to the fullest extent permitted by law, any right to trial by jury of
any claim, demand, action, or cause of action (i) arising under this Agreement
or (ii) in any way connected with or related or incidental to the dealings of
the parties hereto in respect of this Agreement or any of the transactions
related hereto, in each case whether now existing or hereafter arising, and
whether in contract, tort, equity, or otherwise. The parties to this Agreement
each hereby agrees and consents that any such claim, demand, action, or cause
of action shall be decided by court trial without a jury and that the parties
to this Agreement may file an original counterpart of a copy of this Agreement
with any court as written evidence of the consent of the parties hereto to the
waiver of their right to trial by jury.

            (f) Counterparts. This Agreement may be executed in separate
counterparts, each of which is deemed to be an original and all of which taken
together constitute one and the same agreement.

            (g) Successors and Assigns. Except as otherwise provided herein,
this Agreement shall bind and inure to the benefit of and be enforceable by the
Executive, the Company, the Investor


                                      -13-
<PAGE>   14

                                                                [EXECUTION COPY]

and their respective successors and assigns (including subsequent holders of
Executive Stock); provided, that the rights of the Executive under this
Agreement shall not be assignable except in connection with a Transfer of
Executive Stock expressly permitted by the terms of the Stockholders Agreement.

            (h) The Investor's Rights. The Investor is entitled to enforce the
rights of the Company under this Agreement and all other agreements referred to
herein. There are no third party beneficiaries to this Agreement.

            (i) Governing Law. The corporate law of the State of Delaware will
govern all issues concerning the relative rights of the Company and its
stockholders. All other issues concerning this Agreement shall be governed by
and construed in accordance with the laws of the State of Illinois, without
giving effect to any choice of law or conflict of law provision or rule (whether
of the State of Illinois or any other jurisdiction) that would cause the
application of the law of any jurisdiction other than the State of Illinois.

            (j) Remedies. Each of the parties to this Agreement (including the
Investor) will be entitled to enforce its rights under this Agreement
specifically, to recover damages and costs (including reasonable attorneys'
fees) caused by any breach of any provision of this Agreement and to exercise
all other rights existing in its favor. The parties hereto agree and acknowledge
that money damages may not be an adequate remedy for any breach of the
provisions of this Agreement and that any party may in its sole discretion apply
to any court of law or equity of competent jurisdiction (without posting any
bond or deposit) for special performance and/or injunctive or other relief in
order to enforce or prevent any violations of the provisions of this
Agreement.

            (k) Amendment and Waiver. The provisions of this Agreement may be
amended and waived only with the prior written consent of the Company, the
Executive and the Investor.

                                    * * * * *


                                      -14-
<PAGE>   15

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first above written.


                                       KNOWLES ELECTRONICS HOLDINGS, INC.

                                       By: /s/ REGINALD G. GARRATT
                                          ---------------------------------
                                       Its:


                                       KEY ACQUISITION, L.L.C.

                                       By: /s/ KEN TERRY
                                          ---------------------------------
                                       Its:

                                       /s/ JAMES F. BRACE
                                       ------------------------------------
                                       James F. Brace


<PAGE>   16

                                                                   SCHEDULE A

                                  SHARES OF
                                CLASS A COMMON           TOTAL
         EXECUTIVE              STOCK PURCHASED      PURCHASE PRICE
         ---------              ---------------      --------------
      James F. Brace                6,666.67          $200,000.00