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Message: <blockquote data-quote="maylar" data-source="post: 7536320" data-attributes="member: 541144">My Buick had a factory amp that definitely filtered frequencies before sending them to the speakers. The 6x9 "subs" got all the midbass but I'm not sure if it was a simple lowpass or if they filtered out sub bass. 6x9's don't play 30 Hz very well..Tap into the sub woofer outputs and give it a try. If you can't get the deep bass, then switch to the input side. GM feeds those amps with high level speaker signals, on twisted pairs no less.</blockquote>

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