Filed pursuant to Rule No. 424(b)(3)
                                                           File Number 333-99675

                           PROSPECTUS SUPPLEMENT NO. 6

    (to Prospectus dated February 6, 2003, Prospectus Supplement No. 1 dated
                               February 7, 2003,

  Prospectus Supplement No. 2 dated April 8, 2003, Prospectus Supplement No. 3
                               dated May 7, 2003,

Prospectus Supplement No. 4 dated June 13, 2003 and Prospectus Supplement No. 5
                              dated June 27, 2003)


                                4,076,470 SHARES

                         AMERICAN TECHNOLOGY CORPORATION

                                  COMMON STOCK

         This prospectus supplement supplements our prospectus dated February 6,
2003,  Prospectus Supplement No. 1 dated February 7, 2003, Prospectus Supplement
No. 2 dated  April 8,  2003,  Prospectus  Supplement  No. 3 dated  May 7,  2003,
Prospectus  Supplement No. 4 dated June 13, 2003 and Prospectus Supplement No. 5
dated  June 27,  2003.  The  prospectus  relates  to the resale of shares of our
common stock by the selling stockholders identified in the prospectus (including
their transferees,  pledgees, donees or other successors).  You should read this
Prospectus   Supplement  in  conjunction  with  the  prospectus  and  the  prior
prospectus supplements listed above.

AMENDMENT TO SELLING STOCKHOLDER TABLE

         The  information  relating  to Michael  Spencer  in the first  table of
selling stockholders included in the prospectus is hereby amended as follows:



                                                                                        TOTAL              SHARES OF
                            COMMON      COMMON                  COMMON      COMMON     COMMON     MAXIMUM    COMMON
                            STOCK        STOCK                   STOCK      STOCK       STOCK     NUMBER     STOCK
                          UNDERLYING  UNDERLYING              UNDERLYING  UNDERLYING BENEFICIALLY   OF    BENEFICIALLY
                         CONVERTIBLE    COMMON    OUTSTANDING  SERIES D     COMMON      OWNED     SHARES     OWNED
                         SUBORDINATED    STOCK      COMMON     PREFERRED    STOCK      BEFORE     OFFERED    AFTER
  SELLING STOCKHOLDER        NOTE       WARRANT      STOCK       STOCK     WARRANT    OFFERING    HEREBY    OFFERING

                             (1)          (2)         (3)         (4)        (5)         (6)        (7)

          NAME              NUMBER      NUMBER      NUMBER      NUMBER      NUMBER     NUMBER     NUMBER     NUMBER   %
          ----              ------      ------      ------      ------      ------     ------     ------     ------   -
                                                                                              
    Michael Spencer           --          --      11,922(18)       -        11,000     96,209     22,922     89,000   *



(3)      Represents  shares of common  stock  issued upon the  conversion  of an
         aggregate of 185,400 shares of Series D Preferred Stock.

(4)      Represents  shares of common stock  issuable upon the  conversion of an
         aggregate  of 50,000  shares of Series D Preferred  Stock  beneficially
         owned by such persons  assuming the conversion price is $2.00 per share
         and the shares are held to the end of their term,  March 31, 2006.  The
         conversion  value of the Series D Preferred Stock is convertible one or
         more times into fully paid shares of common stock at a conversion price
         which is the lower of (i)  $4.50  per  share or (ii) 90% of the  volume
         weighted  average  market price for the five days prior to  conversion,
         but in no event less than $2.00 per share,  subject to adjustment.  The
         conversion  value of the  Series  D  Preferred  Stock  is the  original
         purchase  price,  increased by 6% per year from May 3, 2002. The shares
         of Series D Preferred  Stock  could not be  converted  at a  conversion
         price less than $4.50 per share prior to December 31, 2002.  The actual
         number of shares of common stock issuable upon conversion of the Series
         D  Preferred  Stock  may be less  than  that  set  forth  in the  chart
         depending on when conversion occurs.




(18)     Mr.  Michael  Spencer  voluntarily  converted  5,000 shares of Series D
         Preferred Stock into 11,922 common shares  effective July 23, 2003. All
         other share ownership  information for the selling stockholder is as of
         January 15, 2003.

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          The date of this prospectus supplement is September 4, 2003.