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.
elberoth2
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
Well said Mjvfashion.

However I simply installed fuel injection on my engine and it was instantly better. No need for new plug wires or a new cam!

Maybe I am just lucky. :)
Kudos Mjfvashon! Well said. A power amp, bottom line, will only amplify what it is feed. I believe the knocks against early CD is that it was solid state shrill. Vinyl did sound better through solid state pre and power amps. Time went on, improvements were made. I know people who will still only listen to vinyl through tube equipment. I think the best improvement a person can make in their system is to have a tube pre-amp or a tube DAC. J. Gordon Holt, once said the best combo was a tube pre with a ss power amp. I took that advice and I will always have a tube pre. As stated in a previous post, I now have a Tripath based power amp and I have no plans to replace it. My system has never sounded better.
Wow! We all know our own equipment is a matter of our own taste and personality. Most of the time when we give our opinion when asked on this site what is better or sounds best we add the IMHO. We all have opinions most of us just don't get paid for them. For some reason if we are paid and published it seems to matter more. I value members of the Audiogon community opinions much more then one single minded reviewers opinion.

Just like mentioned above, "new technology gets it hard like when solid state was new". Remember when CD players were still developing in the late eighties? Philips came out with their TDA1545A 16 bit dac chip. People liked it, but wanted better. Now many designs are being designed that sound better then anything else using this chip. Zanden comes to mind here, if you want a TDA1545A-S2 chip it will cost you $200.00 for just the chip.

My point is in 15 years we will be trying to find these current class D amps because they sound so good and the new technology will be the argument.

I changed from $8K Melos separates to an $8K integrated to a class D amp and tube preamp because it like it.