Class-D amps - a different re view


Martin Colloms, the editor of HiFi Critic (ad-free mag from the UK) have recently published the review of several different Class-D amps, together with an in depth technical analysys and measurments.

His conclusions were not favourable, to say at least:

"I regret that not a single model merits unqualified recommendation. Price is not the issue; the poor listening tests speak for themselves. (...)
At present we have to take the prudent view that good sound might be possible from switching amps, but we haven't heard it yet."

BelCanto REF1000 (ICEpower) - score 10.5 pooints
"The ICE power module used has a dependable reputation, and the design is well built and finished as a whole. While I would not suggest that you shouldn't try this amp, on sound quality grounds alone I cannot recommend it for audiophile use."

Channel Islands D100 (UcD) - score 13 pooints
"While I have reservations about a number of aspects of sound quality, and advise personal audition, given the solid lab results (...) the overall performance and the moderate price, these CA Audio monos do make it to the 'worth considering' cathegory."

NuForce 8.5V2 (proprietary technology) - score 9 pooints
"Yes, the price is good for the power output. Yes it's pretty, light, small and runs cool. However, the sound quality simply does not justify recommendation." (on top of that the NuForce amp measured very poorly - Elb)

Pro-Ject Amp Box (Flying Mole) - score 5 points
"I'm sorry to say that Project (...) was a real disappointment in the listening tests, and can't be recommended."

Just as a point of reference, recently reviewed Krell 700CX scored 100 points, CJ Premier 350 - 110 points and ARC Ref 110 - 135 points.

At least someone have had the balls to say it. This is why HiFi Critic is THE mag to subscribe.
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Hi Lucey, I have no info on the sound or technology of the Halcro MC20 (is it a digital amp?). Red Dragon in my experience does not have stereotypical 'digital amp' artifacts, but to my ears it may be somewaht dark. I Also remember I was hoping to hear a little more of harmonic development and microdynamics when I listened to it last year at RMAF.
Hmmm, If I had only done my homework. . . I would have been able to answer my own question. MC20 from Halcro is a class D amp indeed. And here is its Stereophile review:
http://www.stereophile.com/solidpoweramps/406halcro/
Muralman1, I appreciate that you like what you hear. My point is that to really know if it is right, it is very useful to do on location recordings with professional recording gear (and with the intention to do a good job...).

The master tapes then are very useful in letting you know how a system really sounds, because you were there at the recording. You know what the hall sounds like, where the instruments were placed, how far the mics were from the musicians, that sort of thing. This is assuming that you have good recording technique and the equipment is up to snuff...
Oh, so that means only you know your system is top dog? I believe if a person of good hearing is familiar with acoustic music, they can tell if a recording is doing a good job representing acoustic music. I know the sound of a guitar, so I know if a recording does it right.

I know string instruments, horns, and pianos as they are all played by my family. I have worked musical theatres for years. We have attended symphonic performances from Carnegie to Sunday at the park.

I know this too, tubes are infamous for their coloring, and oversized helping of second order distortion. People steeped in the land of valves are so righteous they can't accept clear musical feedback when they hear it. I know that for sure, because the only disagreement I have had concerns such folks, good friends of mine by the way.
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