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Old 05-07-2009, 07:39 AM   #6
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Join Date: Aug 2003
Location: Burke, VA
Posts: 7,635
My Ride: 2003 330i
If the amp takes balanced-differengtial signals, you can solder RCA wires to the OEM amplifier inputs and plug into the amp.
The rule of thumb I use for designing a system is 2-3 more power for bass than other speakers combined. Since our cars suck for bass, I would lean towards 3-times as much power. If you haven't purchased an amp yet, consider splitting into two amps a 4-channel + a separate amp for the sub.
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