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      09-12-2011, 03:04 PM   #2
VP Electricity
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Drives: F34 xDrive
Join Date: Jan 2008
Location: portland oregon

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The underseats are not subs. They are woofers. Subwoofers play 50 cycles and below. These need to play much higher to meet the 4" mid. They really don't play sub-bass.

I think you have your settings reversed. Your highpass needs to be around 50, and your lowpass needs to be around 200. Ignore the manual. Turn it until it sounds good.

Your risk is that you might blow those stock HiFi woofers, of course.
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