SCHEDULE 13G/A
                               CUSIP NO. 77316P101



                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 SCHEDULE 13G/A

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 6)*

                                 ROCKFORD CORP.
        ----------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
        ----------------------------------------------------------------
                         (Title of Class of Securities)

                                    77316P101
                              --------------------
                                 (CUSIP Number)

                                February 28, 2006
        ----------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

         / X /    Rule 13d-1(b)
         /   /    Rule 13d-1(c)
         /   /    Rule 13d-1(d)

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the  liabilities of the section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).






                                 SCHEDULE 13G/A
                              CUSIP NO. 77316P101


1.  Names of Reporting Persons.
    I.R.S. Identification Nos. of above persons (entities only).

    Quaker Capital Management Corporation
    ----------------------------------------------------------------------------

2.  Check the Appropriate Box if a Member of a Group

         (a)
                  ------
         (b)        X
                  ------

3.  SEC Use Only
                           -----------------------------------------------------

4.  Citizenship or Place of Organization                           Pennsylvania
                                                                  --------------

Number of         5.       Sole Voting Power                      695,000
  Shares                                                          --------------
Beneficially      6.       Shared Voting Power                    63,200
  Owned by                                                        --------------
Each Reporting    7.       Sole Dispositive Power                 695,000
    Person                                                        --------------
         With:    8.       Shared Dispositive Power               63,200
                                                                  --------------

9.  Aggregate Amount Beneficially Owned by Each Reporting Person

    758,200
    ----------------

10. Check if the Aggregate Amount in Row (9) Excludes Certain
    Shares
               --------
    The Reporting Person disclaims  beneficial ownership of 756,900 shares owned
    by its clients.

11. Percent of Class Represented by Amount in Row (9)

                                                                  8.19%
                                                                  --------------

12. Type of Reporting Person                                            IA
                                                                  --------------


                               Page 2 of 7 Pages


                                 SCHEDULE 13G/A
                              CUSIP NO. 77316P101

Item 1.

         (a)      Name of Issuer

                  ROCKFORD CORP.
                  --------------------------------------------------------------

         (b)      Address of Issuer's Principal Executive Offices

                  546 South Rockford Drive, Tempe, Arizona 85281
                  --------------------------------------------------------------
Item 2.

         (a)      Name of Persons Filing

                  Quaker Capital Management Corporation
                  --------------------------------------------------------------

         (b)      Address of Principal Business Office or, if none, Residence

                  401 Wood Street, Suite 1300, Pittsburgh, PA  15222
                  --------------------------------------------------------------

         (c)      Citizenship

                  Pennsylvania Corporation
                  --------------------------------------------------------------

         (d)      Title of Class of Securities

                  Common Stock
                  --------------------------------------------------------------

         (e)      CUSIP Number

                  77316P101
                  --------------------------------------------------------------



                               Page 3 of 7 Pages




                                 SCHEDULE 13G/A
                              CUSIP NO. 77316P101



Item 3.  If this statement is filed pursuant to ss.ss.240.13d-1(b) or  240.13d-2
         (b) or (c), check whether the person filing is a:

     (a) /   /    Broker of dealer registered under section 15 of the Act;

     (b) /   /    Bank as defined in section 3(a)(6) of the Act;

     (c) /   /    Insurance company as defined in section 3(a)(19) of the   Act;

     (d) /   /    Investment   company   registered    under   section  8 of the
                  Investment Company Act of 1940;

     (e) / X /    An investment adviser  in  accordance with  ss.240.13d-1(b)(l)
                  (ii)(E);

     (f) /   /    An employee   benefit  plan  or  endowment  fund in accordance
                  with ss.240.13d-1(b)(1)(ii)(F);

     (g) /   /    A parent  holding company or control person in accordance with
                  ss.240.13d-1(b)(1)(ii)(G);

     (h) /   /    A  savings  association  as   defined  in Section  3(b) of the
                  Federal Deposit Insurance Act;

     (i) /   /    A  church  plan  that  is excluded  from the  definition of an
                  investment  company under section  3(c)(14) of the  Investment
                  Company Act of 1940;

     (j) /   /    Group, in accordance with ss.240.13d-1((b)(l)(ii)(J)

Item 4.  Ownership
         ---------

         (a)      The Reporting Person,  in its capacity as investment  adviser,
                  may be deemed to be the beneficial  owner of 756,900 shares of
                  the  Common  Stock of the  Issuer  which are owned by  various
                  investment   advisory  clients  of  the  Reporting  Person  in
                  accounts  over which the  Reporting  Person has  discretionary
                  authority. The filing of this report shall not be construed as
                  an  admission  that the  Reporting  Person is, for purposes of
                  Section  13(d) or 13(g) of the Act,  the  beneficial  owner of
                  these  securities.  Additionally,  the


                               Page 4 of 7 Pages



                                 SCHEDULE 13G/A
                              CUSIP NO. 77316P101



                  Reporting Person and/or its principals and employees own 1,300
                  shares of the Common Stock of the Issuer.

         (b)      The  shares  covered  by this  report  represent  8.19% of the
                  Common Stock of the Issuer.

         (c)      The Reporting  Person has shared voting and dispositive  power
                  over 63,200 shares and sole voting and dispositive  power over
                  693,700  shares owned by its clients and held in accounts over
                  which it has  discretionary  authority.  The Reporting  Person
                  and/or  its  principals  and  employees  have sole  voting and
                  dispositive power over the 1,300 shares owned by the Reporting
                  Person and/or its principals and employees.

Item 5.  Ownership of Five Percent or Less of a Class

                  If this statement is being filed to report the fact that as of
the date hereof,  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

         756,900 of the  shares  with  respect to which this  eport is filed are
owned by a variety of investment advisory clients of the Reporting Person, which
clients are entitled to receive  dividends on and the proceeds  from the sale of
such shares. No client is known to own more than 5% of the class.

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



                               Page 5 of 7 Pages


                                 SCHEDULE 13G/A
                              CUSIP NO. 77316P101

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




                               Page 6 of 7 Pages





                                    SIGNATURE

                  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 and correct.


                                           QUAKER CAPITAL MANAGEMENT CORPORATION

                                                   March 9, 2006
                                                   -----------------------------
                                                                  Date



                                                   /s/ Mark G. Schoeppner
                                                   -----------------------------
                                                                 Signature



                                                   Mark G. Schoeppner, President
                                                   -----------------------------
                                                                  Name/Title





                               Page 7 of 7 Pages