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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As a CI D200 owner and lover for the last two years, I find it quite interesting that these amps very rarely come up on the used market.

In fact, I'd say of all the amps mentioned in this endless thread, the CI D200 are by far the least seen on Audiogon.

Given the number of these amps out there, I'd say that's the ULTIMATE test of actually how good an amp is, is an owners complete satisfaction and not wanting to sell it in an attempt to upgrade.
the satisfaction of an owner of a component is not a predictor of the satisfaction of a potential owner of that product.
Partially agree with Atmasphere on semiconductor comment.

I've done some work in my SS class AB amplifier, I have the service manual and parts such diodes, transistors, capacitors (i.e. things that are most likely to break) aren't hard to come by at all.

I agree with you thoughts about class-d though, they have a lot of IC's and surface mount devices. Even if you do find the part you need, installing it will be a pain and expensive (if you choose to let a shop do the repair work for you)
Mrtennis...Not an absolute predictor, but a useful indication. Why else do we contribute opinions, pro or con, on this web site?