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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 NkZnIfaQBfflphWj3hFAjTKCJXVR39IONlBjJcM8QIR3s8yehawBHWrgCy0gf5Jz
 y4obNrpHZeXIPKJKAAsglg==

<SEC-DOCUMENT>0001209191-03-012232.txt : 20030717
<SEC-HEADER>0001209191-03-012232.hdr.sgml : 20030717
<ACCEPTANCE-DATETIME>20030717122143
ACCESSION NUMBER:		0001209191-03-012232
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030715
FILED AS OF DATE:		20030717

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DIGITAL THEATER SYSTEMS INC
		CENTRAL INDEX KEY:			0001226308
		STANDARD INDUSTRIAL CLASSIFICATION:	HOUSEHOLD AUDIO & VIDEO EQUIPMENT [3651]
		IRS NUMBER:				770467655
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		5171 CLARETON DRIVE
		CITY:			AGOURA HILLS
		STATE:			CA
		ZIP:			91301

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FORTH INVESTMENTS LLC
		CENTRAL INDEX KEY:			0001249887

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50335
		FILM NUMBER:		03790723

	BUSINESS ADDRESS:	
		STREET 1:		11400 W OLYMPIC BLVD STE 550
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90064
		BUSINESS PHONE:		3104813515
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?><ownershipDocument><schemaVersion>X0101</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-07-15</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0001226308</issuerCik><issuerName>DIGITAL THEATER SYSTEMS INC</issuerName>        <issuerTradingSymbol>DTSI</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001249887</rptOwnerCik><rptOwnerName>FORTH INVESTMENTS LLC</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>  </rptOwnerStreet1><rptOwnerStreet2>  </rptOwnerStreet2><rptOwnerCity>  </rptOwnerCity><rptOwnerState>  </rptOwnerState><rptOwnerZipCode>  </rptOwnerZipCode></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>1</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeSecurity><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-07-15</va
lue></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>66084</value></transactionShares><transactionValue><value>17</value></transactionValue><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>1111847</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeSecurity><footnotes></footnotes><ownerSignature><signatureName>FORTH INVESTMENTS LLC, By: For Them, Inc., Manager, /s/ Michael Rutman, CFO</signatureName><signatureDate>2003-07-16</signatureDate></ownerSignature></ownershipDocument>

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