<SUBMISSION>
<ACCESSION-NUMBER>0001209191-03-011812
<TYPE>4/A
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20030703
<FILING-DATE>20030714
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>PLATISA GEORGE C
<CIK>0001251839
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>4/A
<ACT>34
<FILE-NUMBER>000-01461
<FILM-NUMBER>03785379
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>C/O ASCENT MEDIA GROUP INC
<STREET2>520 BROADWAY 5TH FLOOR
<CITY>SANTA MONICA
<STATE>CA
<ZIP>90401
</MAIL-ADDRESS>
</REPORTING-OWNER>
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>ASCENT MEDIA GROUP INC
<CIK>0000061442
<ASSIGNED-SIC>7822
<IRS-NUMBER>131679856
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>520 BROADWAY
<STREET2>FIFTH FLOOR
<CITY>SANTA MONICA
<STATE>CA
<ZIP>90401
<PHONE>3104347000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>520 BROADWAY
<STREET2>FIFTH FLOOR
<CITY>SANTA MONICA
<STATE>CA
<ZIP>90401
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>LIBERTY LIVEWIRE CORP
<DATE-CHANGED>20000609
</FORMER-COMPANY>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>TODD AO CORP
<DATE-CHANGED>19920703
</FORMER-COMPANY>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>MAGNA PICTURES CORP
<DATE-CHANGED>19851128
</FORMER-COMPANY>
</ISSUER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>doc4a.xml
<DESCRIPTION>FORM 4/A SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?><ownershipDocument><schemaVersion>X0101</schemaVersion>    <documentType>4/A</documentType><periodOfReport>2003-07-03</periodOfReport><dateOfOriginalSubmission>2003-07-03</dateOfOriginalSubmission><notSubjectToSection16>1</notSubjectToSection16><issuer><issuerCik>0000061442</issuerCik><issuerName>ASCENT MEDIA GROUP INC</issuerName>        <issuerTradingSymbol>AMGIA</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001251839</rptOwnerCik><rptOwnerName>PLATISA GEORGE C</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>  </rptOwnerStreet1><rptOwnerStreet2>  </rptOwnerStreet2><rptOwnerCity>  </rptOwnerCity><rptOwnerState>  </rptOwnerState><rptOwnerZipCode>  </rptOwnerZipCode></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Executive VP and CFO</officerTitle></reportingOwnerRelationship></reportingOwner><derivativeSecurity><securityTitle><value>Stock Option</value><footnoteId id="F4" /></securityTitle><conversionOrExercisePrice><value>7</value></conversionOrExercisePrice><transactionDate><value>2003-07-01</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>J</transactionCode><equitySwapInvolved>0</equitySwapInvolved><footnoteId id="F1" /></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>250000</value></transactionShares><transactionValue><value>0</value><footnoteId id="F3" /></transactionValue><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>2003-05-14</value><footnoteId id="F2" /></exerciseDate><expirationDate><value>2011-11-15</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Class A Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>250000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>0</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeSecurity><footnotes><footnote id="F1">A wholly-owned subsidiary of Liberty Media Corporation ("Liberty Media") merged with and into the Issuer on July 1, 2003 (the "Merger").  At the effective time of the Merger, each stock option of the Issuer held by the Reporting Person immediately prior to the effective time of the Merger was assumed by Liberty Media and converted into an option exercisable for 0.1147 of a share of Liberty Media's Series A Common Stock for each share of Class A Common Stock of the Issuer for which such stock option was exercisable.</footnote><footnote id="F2">Twenty-five percent (25%) of the option became exercisable on May 14, 2003, the next 25% becomes exercisable on May 14, 2004, the next 25% becomes exercisable on May 14, 2005 and the final 25% becomes exercisable on May 14, 2006.</footnote><footnote id="F3">The stock options were issued to the Reporting Person as part of his compensation package and no cash was paid for the stock options.</footnote><footnote id="F4">This amendment is being filed solely to indicate that the Reporting Person is no longer subject to Section 16 of the Securities Exchange Act of 1934, as amended.  The original filing contained an electronic system error beyond the control of the electronic filer caused by the third party administrator that omitted the check mark that indicates that the Reporting Person is no longer subject to Section 16. </footnote></footnotes><ownerSignature><signatureName>George C. Platisa</signatureName><signatureDate>2003-07-14</signatureDate></ownerSignature></ownershipDocument>

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</SUBMISSION>
