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Proc-Type: 2001,MIC-CLEAR
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0000354204-99-000394.txt : 19990212
<SEC-HEADER>0000354204-99-000394.hdr.sgml : 19990212
ACCESSION NUMBER:		0000354204-99-000394
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		19990211

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KOSS CORP
		CENTRAL INDEX KEY:			0000056701
		STANDARD INDUSTRIAL CLASSIFICATION:	HOUSEHOLD AUDIO & VIDEO EQUIPMENT [3651]
		IRS NUMBER:				391168275
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		
		SEC FILE NUMBER:	005-10504
		FILM NUMBER:		99532129

	BUSINESS ADDRESS:	
		STREET 1:		4129 N PORT WASHINGTON AVE
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53212
		BUSINESS PHONE:		4149645000

	MAIL ADDRESS:	
		STREET 1:		C/O WHYTE HIRSCHBOECK DUDEK S C
		STREET 2:		111 EAST WISCONSIN AVENUE
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53202

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	KOSS ELECTRONICS INC
		DATE OF NAME CHANGE:	19721005

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	REK O KUT CO INC
		DATE OF NAME CHANGE:	19680124

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DIMENSIONAL FUND ADVISORS INC
		CENTRAL INDEX KEY:			0000354204
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				22370029
		STATE OF INCORPORATION:			IL
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		1299 OCEAN AVE
		STREET 2:		11TH FLOOR
		CITY:			SANTA MONICA
		STATE:			CA
		ZIP:			90401
		BUSINESS PHONE:		3103958005

	MAIL ADDRESS:	
		STREET 1:		1299 OCEAN AVENUE
		STREET 2:		11TH FLOOR
		CITY:			SANTA MONICA
		STATE:			CA
		ZIP:			90401
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<DESCRIPTION>1998 SCHEDULE 13G  -  KOSS CORP
<TEXT>


- -------------------------------------------------------------------
                                                       Page 1 of 4

SCHEDULE 13G
 (12/31/98)

KOSS CORP
Cusip # 500692108
AMENDMENT

- --------------------------------------------------------------------
                                                        Page 2 of 4

Cusip # 500692108

Item  1:    REPORTING PERSONS
            Dimensional Fund Advisors Inc. (Tax ID: 22-2370029)

Item  4:    CITIZENSHIP
            Delaware Corporation

Item  5:    SOLE VOTING POWER
            209,400           ** see Note 1 **

Item  6:    SHARED VOTING POWER --
            None

Item  7:    SOLE DISPOSITIVE POWER --
            209,400           ** see Note 1 **

Item  8:    SHARED DISPOSITIVE POWER --
            0

Item  9:    AGGREGATE AMOUNT BENEFICIALLY OWNED --
            209,400           ** see Note 1 **

Item 11:    PERCENT OF CLASS REPRESENTED BY LINE 9 --
            6.59

Item 12:    TYPE OF REPORTING PERSON --
            IA

- -----------------------------------------------------------------------
                                                    Page 3 of 4

ITEM 1(A).  NAME OF ISSUER

            KOSS CORP

ITEM 1(B).  ADDRESS OF ISSUER

            4129 N. Port Washington Ave.
            Milwaukee  WI   53212


ITEM 2(A).  NAME OF PERSON FILING

            Dimensional Fund Advisors

ITEM 2(B).  ADDRESS OF PRINCIPAL BUSINESS OFFICE

            1299 Ocean Avenue, 11th Floor, Santa Monica, CA  90401

ITEM 2(C).  CITIZENSHIP

            A Delaware Corporation

ITEM 2(D).  TITLE OF CLASS OF SECURITIES

            Common Stock

ITEM 2(E).  CUSIP NUMBER

            500692108

ITEM 3.     This statement is filed pursuant to Rule 13d-1 (b), or
            13d-2 (b) and the person filing is an investment advisor
            registered under section 203 of the Investment Advisors
            Act of 1940.

- ---------------------------------------------------------------------
                                                 Page 4 of 4

ITEM 4.     OWNERSHIP
ITEM 4(a).  AMOUNT BENEFICIALLY OWNED
              209,400            ** see Note 1 **
ITEM 4(b).  PERCENT OF CLASS
             6.59
ITEM 4(c).  NUMBER OF SHARE AS TO WHICH SUCH PERSON HAS:
      (i).  SOLE POWER TO VOTE OR DIRECT THE VOTE --
              209,400            ** see Note 1 **
     (ii).  SHARED POWER TO VOTE OR TO DIRECT THE VOTE --
            None
    (iii).  SOLE POWER TO DISPOSE OR TO DIRECT DISPOSITION OF --
              209,400            ** see Note 1 **
     (iv).  SHARE POWER TO DISPOSE OR TO DIRECT DISPOSISTION OF --
            None

    ** Note 1 **
    Dimensional Fund Advisors Inc. ("Dimensional"), an investment
    advisor registered under the Investment Advisors Act of 1940,
    furnishes investment advice to four investment companies
    registered under Investment Company Act of 1940, and serves as
    investment manager to certain other investment vehicles, including
    commingled group trusts.  (These investment companies and
    investment vehicles are the "Portfolios"). In its role as
    investment advisor and investment manager, Dimensional possesses
    both voting and investment power over the securities of the Issuer
    described in this schedule that are owned by the Portfolios.  All
    securities reported in this schedule are owned by the Portfolios,
    and Dimensional disclaims beneficial ownership of such securities.

ITEM 5.     OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
            If this statement is being filed to report the fact that
            as of 12/31/98 the reporting person has ceased to be the
            beneficial owner of more than five percent of the class
            of securities, check the following: [ ]

ITEM 6.     OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF
            ANOTHER PERSON
            All Securities reported in this schedule are onwed by
            advisory clients of Dimensional Fund Advisors Inc., no one
            of which to the knowledge of Dimensional Fund Advisors Inc.
            owns more than 5% of the class.  Dimensional Fund Advisors
            Inc disclaims beneficial ownership of all such securities.

ITEM 7.     IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
            ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
            COMPANY:
            Not Applicable

ITEM 8.     IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
            Not Applicable

ITEM 9.     NOTICE OF DISSOLUTION OF GROUP
            Not Applicable

ITEM 10.    CERTIFICATION
            By signing below I certify that, to the best of my knowledge
            and belief, the securities referred to above were acquired
            in the ordinary course of business and were not acquired for
            the purpose of and do not have the effect of changing or
            influencing the control of the issuer of such securities
            and were not acquired in connection with or as a participant
            in any transaction having such purposes or effect.

After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true,
complete are correct.

Signature

   Friday, February 12, 1999

   Michael T. Scardina
   Vice President and Chief Finacial Officer


</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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