Try DIYaudio, lots of people there experimenting with chip amps. :)
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Most full range driver loudspeakers are meant to be driven by an amplifier with a fairly high output impedance. Running it with an amplifier with a low output impedance (and all class D amps have a low output impedance) will result in a tonal anomaly of some sort- my guess is less bass in this case. For more on this topic see
I'll just put this out there, but awhile back, I purchased a set of AN drivers myself, and along with them, I got the class D amp from Audio Nirvana as well. Turns out that I used it for awhile, then it ended up in my shop. If you might be interested, I can offer it to you at a price that you would likely agree with.
I have owned numerous AN drivers with great results, except for the co-axial drivers, which are no longer offered.