Originally Posted by cschang
hifisponge, was that comment about IcePower or Class D in general?
I should probably ask that in the other thread....
I've read every review and all the user opinions I can find on the current Class D amps and the two that seem to be in the front running are NuForce and IcePower.
The commonalities within all of the reviews is that Class D has excellent bass control, good retrieval of low level detail in the mids, an excellent noise floor (black background), and a lack of SS grain, but that all of them to some extent fall short in high frequency reproduction in some form or another.
Nuforce takes the crown for bass control and dynamics and seems to receive fewer complaints about the HF quality than IcePower, but it has been criticized by some to sound artificially clean and even somewhat analytical.
Traits noted as being common in reviews of amps using IcePower is that they have a warmer, rounder, almost tube-like quality but that the treble sounds slightly rolled off and lacking "air". Bass quality has been called everything from excellent to somewhat indistinct (unlike the unanimous praise NuForce receives for bass). Midrange seems to be the strong suit, having that rare combination of detail and smoothness with good harmonic density.
The one thing that I was surprised to see was the absolute absence of comments stating that these amps sounded cold, dry, or electronic.
Objectively, looking at the measurements of IcePower amps, it is somewhat disconcerting the amount of distortion from 10KHz on up when these amps are pushed much above 100 watts.
Bel Canto Ref 1000 (uses minimally modified IcePower amp module):
4-ohm output loading
Cyan line: 500W
Blue line: 100W
Magenta line: 10W
Red line: 1W
This is all just regurgitated information at this point. I still plan on auditioning the Bel Canto's and the NuForce's within the next few months to get some first hand impressions of the sound quality.