Here is one of the best example posts I have read. Bob Hazlewood is probably one of the smartest guys to objectively explore the DSP amp . Most of the statements in this post and others are internally and externally verifiable. In this post, he is correcting a guy who makes a random statement that the DSP amp channel is comparable to a 5 – 10 WPC amplifier. Essentially, Bob says that the bigger channels are built on amps rated at 55W at 10% THD. Bob normalizes those to 40W amps at “low distortion.” This is actually 30% more power than the BMW's figures (30W per channel on the big channels). Bob’s analysis of the DSP amp is comparable to other similarly powered car audio systems that I have enjoyed—that the BMW system is probably comparable to a 300W to 500W total power system. The major weakness of the BMW system DSP is the subs, but that is because BMW went with space saving rather than audio performance on that decision.
There are probably a couple other posts like these in the Internet ether, but this one sums it up the best.
http://bimmer.roadfly.com/5series/me...w28/63184.html
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