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Message: <blockquote data-quote="borisshnitkin" data-source="post: 232066" data-attributes="member: 547250">i have 2 alpine type r's and they are in a ported box. i was wondering if i can get the jbl600 even though it doesn't have a subsonic filter.please post some answers. would i really need a subsonic filter for the system.i am also getting the alpine 9805 in the mail tomorrow. maybe there is some type of settings on the headunit that would block out certain frequences.please help!!!!!!!!!!</blockquote>

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