Yes, but with a few caveats. (archive)

What you are proposng will work, with a few things thay you should be aware of:
1. There are four subwoofer outputs from the BMW amp. The woofers are both dual voice coil, and BMW uses two relatively low powered amps onm each woofer instead of a single higher powered one. You don't need to use all four, since all the outputs are the same.
2. Each output is floating ground (Neither the + nor - wire is grounded). Therefore you will need either an amplifier which will accept floating ground inputs, or a floating ground line output converter between the BMW amp and the new amp. This is not a problem as far as sound quality is concerned for a subwoofer output like this, although it is not optimum at high frequencies.
3. There is no way to bypass the pre-existing BMW crossover settings, so you're stuck with them. This isn't distaster, since they are usable as is, but it would be nice to have a bit more tunability. JimL installed an EQ between the BMW stuff and the new amp, which is the ideal scenario, but I've heard systems without the EQ which sounded very good also.

Best regards,
Bob Hazelwood
Product Manager, Cambridge SoundWorks
BMW CCA (Boston)

: Hi, i am thinking about increasing the base in my car by doing the following modifications. I have the DSP premium sound system. I know this topic has been covered a thousand times but I really do need help on this and this question has never been asked in the previous message archive. I am thinking about cutting the wire to the factory sub-woofer and connect that wire to a separate amp to power a stronger sub-woofer. Is this possible?? Can this be done or has anyone done this? Or does the DSP make is impossible?

: kent

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