------------------------------ OMB APPROVAL ------------------------------ OMB Number 3235-0287 Expires: 12-31-2001 Estimated average burden hours per response ....... 0.5 ------------------------------ U.S. SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). (Print or Type Responses) ________________________________________________________________________________ 1. Name and Address of Reporting Person* McMartin Robert W. ________________________________________________________________________________ (Last) (First) (Middle) 2522 West Geneva Drive ________________________________________________________________________________ (Street) Tempe Arizona 85282 ________________________________________________________________________________ (City) (State) (Zip) ________________________________________________________________________________ 2. Issuer Name and Ticker or Trading Symbol Circuit Research Labs, Inc. (CRLI) ________________________________________________________________________________ 3. IRS Identification Number of Reporting Person, if an Entity (Voluntary) ________________________________________________________________________________ 4. Statement for Month/Year September, 2001 ________________________________________________________________________________ 5. If Amendment, Date of Original (Month/Year) ================================================================================ 6. Relationship of Reporting Person to Issuer (Check all applicable) [ ] Director [ ] 10% Owner [X] Officer (give title below) [_] Other (specify below) Vice President and Chief Financial Officer ________________________________________________________________________________ 7. Individual or Joint/Group Filing (Check applicable line) [X] Form filed by 1 Reporting Person [_] Form filed by more than 1 Reporting Person ________________________________________________________________________________ ================================================================================ Table I -- Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned ================================================================================

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. *If the form if filed by more than one reporting person, see Instruction 4(b)(v) Page 1 of 2 FORM 4 (continued) Table II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities) ================================================================================

Explanation of Responses: (1) Shares were acquired under the Circuit Research Labs, Inc. Employee Monthly Stock Investment Plan in September 2001. /s/ Robert W. McMartin 10/11/01 --------------------------------------------- ----------------------- **Signature of Reporting Person Date ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). Note: File three copies of this Form, one of which must be manually signed. If space provided is insufficient, see Instruction 6 for procedure. Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number. Page 2 of 2

MCMARTIN ROBERT 4