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.
128x128elberoth2
Sure they can sound good,but why oh why did they all get such a terrible low score?Not even in the 40's ,50's,what 8,10.13?Mid fi at best
I'm quite happy with my class d amps. Yes the manufacturer offers upgrades at a not so out of site price. Yes i have upgraded twice, Yes each time my amps have increased in there ability to make music better. And yes i use a tubed preamp for now with my class d amps. A bit of the old with the new. For the life of me i cant understand why some have to believe that what they like is the only thing thats any good. Guys and gals if you have a amp and system thats to your liking i am so glad for you. Dont argue that its better than mine.
Enjoy your system and i will enjoy mine.
Mid-Fi huh. . . Oh Dear. . . I really did not realize the horrible implication of those scores! And I have been all along singin' the virtues of mere mid-fi trailer-trash electronics. . . how could I? What are my neighbors going to say if they only find out what questionable company I have been keepin'?! . . . I's so sorry I's so sorry. . . I really didn't know nothin' none of it!
Coffeey: "Sure they can sound good,but why oh why did they all get such a terrible low score?Not even in the 40's ,50's,what 8,10.13?Mid fi at best"

I think "4" might be better. Then the Accuphase A-50V should have a "3" and the Mark Levinson 333 a "2" :)

Chris
I will preface my remark by saying I have not listened to any of Class D amps except at a couple of the Audio shows so I won't attempt to argue or debate the issues of sonics but to follow up on Ralph's (Atmasphere) points; I don't think Ralph thinks/thought that we (most audiophiles) would in fact have our amps, pre, DAC's etc for 10+ years, although we certainly could if we got off this merry-go-round, Ralph knows the Audiophile weaknesses. The point as I see it is, tube amps will have value after that 10-20+ years where the "D" amp will be worth 000000. No one will be able to service the "D" amp if one of the chips or digital circuits should fail. At that point the amp is worthless. Case in point, I have several 50-60's Fisher, Scott, and Marantz pieces that are worth more today than the day they were sold new and in the Marantz case many, many times its original value. If I can't fix these pieces most qualified techs can get them back up and running.

Ralph if I have miss-interpreted your point please correct me............Bob