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Only BMW knows for sure, and they're not saying. Someone would have to measure them. If the HU has a pre-shape EQ that's tuned for best results with the base midrange with no tweeters then it's not going to be right with the H-K or Hi-Fi midranges with tweeters. The low power of the HU internal amps will also result in high THD when pushed to even moderate levels, which can add to harsh response through tweeters. I doubt that the HU is capable of 25w/ch, as it requires a sophisticated step up power supply to get more than 15w or so from 12v.
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