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Oh! - I can't agree with that, well up to a point I can. Disclaimer: I've never heard a LMxxxx chipamp.
Class D is a pretty wide range of stuff, and they're significantly varied animals. The old concept of "Class D" focused only on efficiency, and may have low, fixed switching rates and simple topologies. Newer designs are very different, have constantly varying switching frequencies approaching a MHz, complex modulators etc. etc. - this is "grown up" class D. Brands include like UcD, Tripath, NewClassD, Icepower etc.
As I haven't heard an LM chipamp, I can only refer to opinion. The opinion that I've seen is that the LM's have an edge in bass, but that Tripath, for instance, generally have better dynamics, transparency, sweet midrange etc.
The only concrete comparison I have is between
A) Some 41Hz.com amps, Amp6, Amp6-BASIC, Amp11
B) Antique Sound Lab Wave AV-8, valve monoblocks
The AV-8 was the best sounding amplifier I had heard 3-4 years ago. The Tripath amps I have built are very, very close to that. Not identical - the valve amp was a sliver more magical in a hazy way, but the Tripath amps are a bit more realistic - but definitely still "magical".
IMO in short-
Valve amps are like a beautiful, warm, golden-red sunset, while Tripath amps are like a beautiful, crisp, colorful sunrise morning.
What a long post
The point is: I am not knocking chipamps in any way - I however encourage everyone to surprise themselves by listening to a good Class D amp.