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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Showing 3 responses by bbro

I am now driving my Magnepan 20Rs with a Spectron Musician III and previously a pair of Bel Canto ref 1000 monoblocs and both bested the big boy SS Class A and A/B amps that I have had in my system before.
Addition to my above post:

Take a look at mjfvashon and Platos comments above. The Bel Cantos in mjfvashons rig and the NuForce in Platos both let their superb front ends ie Bel Canto DAC-3 and 6Sn7 based pre respectively shine through. I drive my Spectron Musician III with either a deHavilland Ultraverve octal based pre using 6SN7s with a 5AW4 rectifier or a highly modified 6922 based pre both with superb results. Maybe in our systems it is the synergy or resultant open window on our pre that makes our systems work so well. FYI I am using a BelCanto DAC-2 with various transports for source.
In answer to Jdillard.

Yes most class D switching amps do use the B&O with the expeption of Spectron, which use their own proprietary module plus a lot of very high speed sampling/feedback plus a very large transformer. I have listened to the B&O based units and the Spectron (Musician III) and the difference is very significant. And I agree with Jw94055 that a tube preamp is definitely advised.