Quote:
Originally Posted by Billfitz
That's highly doubtful. The main factors limiting what they're capable of are the size of the enclosures and the power of the amp driving them. The ideal setup would be an amp with a built in crossover that sends the lowest frequencies to a trunk mounted sub, removing that load from the under seat woofers entirely. There are many ways to do that cheaply with traditional analog output head units, but the BMW head unit output is digital and proprietary, so the cost of aftermarket amps that will work with it is at least doubled.
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You need a Mobridge processor to go to an aftermarket amp. The Mobridge DA1 is around $600. My HK amp is in a box in the garage. The Mobridge goes to an Alpine DSP and then that leads to a pair of amps (one for the trunk sub, one for the cabin speakers...MusicarNW system and install). It can all be done, but its not cheap. You can get to fantastic sound if you put the money into it. There aren't a lot of cheaper routes that are worth doing with HK as a starting point.