Exhibit 99.4

                    CERTIFICATION OF CHIEF FINANCIAL OFFICER
                                   PURSUANT TO
                             18 U.S.C. SECTION 1350


In connection with the quarterly report of Circuit Research Labs, Inc. (the
"Company") on Form 10-QSB for the period ending March 31, 2003 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Robert W. McMartin, Chief Financial Officer of the Company, certify, to the best
of my knowledge, pursuant to 18 U.S.C. 1350, as adopted pursuant to  906 of the
Sarbanes-Oxley Act of 2002, that:

     (1)  The Report fully complies with the requirements of Section 13(a) or
          15(d) of the Securities Exchange Act of 1934; and

     (2)  The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Company.


                                        /s/ Robert W. McMartin
                                        ----------------------------
                                        Robert W. McMartin
                                        Chief Financial Officer
                                        Circuit Research Labs, Inc.
                                        May 20, 2003




This certification accompanies this Report on Form 10-QSB pursuant to Section
906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent
required by such Act, be deemed filed by the Company for purposes of Section 18
of the Securities Exchange Act of 1934.