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
Nuforce as a company does not consider there amps as digital, they call them analog switching amps with very high bandwidth, low distortion.
In my system the lack of body is not a issue. in the end its the same song what works for you is all that matters. and until the cows come home there will always be those who reject anything thats different than what the norm has been.
Florian, Looney (proper spelling) is the guy who figured out who Shakespeare is. I agree with him, and proudly wear the looney label.
Phd, wanting "body" in your playback is, of course, a valid desire. Big AB amps are the best for that. Class A breaks down the body into mellow details. Tubes take the dissection further. You simply hear more of what is recorded. Great class D will completely disassemble the body into it's respective parts. A well set up class D system will resemble a great SET system in detail and proper timbre, only the class D will be more dynamic.
Let's say you've got a hotrod with a high performance engine. Maybe this engine has an old school fuel delivery system. Maybe you'd like to update the fuel delivery system with some new technology. You cannot expect maximum performance by simply removing the old fuel system and installing the new one. You're going to have to put in some time and make some adjustments to the rest of the system to realize the fullest potential of the new technology. What those adjustments will be are going to be determined by the rest of the rig and of course your own personal needs and preferences.
Those of us that have switched to Class-D amps and have put in the time and made the adjustments to the rest of the system are being rewarded accordingly.
Like many others who have responded, my rig has never sounded better or performed more efficiently than it does now with the Class-D amps.
I've had a lot of different gear and regardless of how good any of that previous gear was, none of it has delivered the goods like the goods are being delivered now. I've experienced absolutely no downside whatsoever by making the change to Class-D...only positive.
These amps take up substantially less space, they use a lot less power (my power bill went down $14.00 a month simply by changing to these amps), and they put out virtually no heat.
At the same time they have over twice the power output of my previous room heaters, and they are more neutral, more dynamic with better detail, faster and they have more body. I'm sure I could list other attributes but you get the idea.
Regardless of the item or the topic, there will always be those that cannot or will not accept that something new or different could possibly be better. Is it going to be better for everybody...probably not. But that doesn't mean it can't be better for those willing to give it an adequate chance.
I for one could not be happier that I made the change and put forth the time and effort to optimize that change. I will not be switching back and I think as this technology becomes more refined we're going to see a lot of others making the switch as well.
This has really been an interesting and enjoyable thread and one that I am following closely. I'm glad to see so many responses and equally glad to see that I don't stand alone in the Class-D camp.
Keep it fun everybody and enjoy the music. I know I am!


Looking at this thread as a whole it seems to me there are fewer class D detractors than in months past. The few that are here have at least had some first hand experience with the a product and politely didn't care for their presentation.

After looking at the Colloms review I must say he presents very convincing case for someone who maybe thinking of crossing over to the D side. Which in itself has me wondering why would anybody put that much effort into disparaging the performance of these amplifiers. My first thought was to support and clarify the TAS shoddy shootout. Whatever his reasoning is, what does the audio press stand to gain by labeling class D as not HI-FI?

Vic