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      09-01-2010, 07:18 PM   #3
kaigoss69
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Drives: '08 335i
Join Date: Jul 2008
Location: JAX

iTrader: (5)

Kicker SSMB8 under the seats would probably be your best bet. If you can, high-pass the "front" signal from the HU at around 50 - 60 Hz and then use the amp's low-pass filter, set to around 150 Hz, to bandpass the signal going to the underseat woofers.

The other split from the "front" signal, going to the door speakers, should be high-passed at the amp, at around 150Hz. However, if they are crappy OEM base system speakers, expect to replace them in the near future.