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Racer,
I got the JL XD600/6 amp recommended on this forum by Technics and others. technics makes a wiring harness that allows you to translate the BMW wiring into leads and connectors suitable for an aftermarket amp. His leads are clearly marked, makes the substitution of an amp much easier.
I have the HiFi system, which in this case is an advantage since they are easier to mod than the Logic 7. My case is also a litttle different in that I am replacing the underseat woofers. The BSW kit does not replace those. BSW suggests their aftermarket sub to augment low frequencies, but they still assume the midbass will be handled by the OEM underseat woofers. Some people, like myself, are concerned that lack of attention to the midbass can not be compensated for by an increase in the lowest octave.
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