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

Showing 7 responses by sirspeedy

I am late to this party,but want to give a simple opinion.
Firstly, virtually all new technology gets "knocked" when first introduced.Nobody wants to give up their present stuff.I don't think any owners of Class D designs should get nervous,from some criticism,especially if it sounds good to you.You cannot have too bad hearing,or you would not be in this hobby!!
Secondly,the Abs Sound forum is yesterday's news,as it took place a while ago,and technology has improved since then.I do remember Jeff Rowland stating he would use whatever "modular" technology he felt was advanced enough,and good sounding enough to put in his stuff.He seemed open minded about the newer technology,and wanted to embrace it,while it appeared(to me) that Dan D'agostino was intentionally contradicting Jeff's input.Look what has happened to Krell,these days....Just a thought.
I don't own a "D" class amp,but did have Jeff put in two of the industry's latest Switch Mode modules in the power supply "second" chassis of my "two" chassis 8T amp.I previously had an older S.M. module which replaced and outperformed the battery held within the second chassis.I didn't think it could,but it most certainly was quieter and far more dynamic.
I was extremely happy with the battery,but the new S.M. "original" update was considerably better,period.Believe it or not!!NOW the dual module S.M. power modules that have gone in recently, absolutely outclass both the battery,and first (superb sounding) S.M.(switch mode)power supply.Who knew?
I was sceptical at first but the performance is rediculously good!....The amp runs COOL too!!To me "that" is a "cool" thing....My previous Krell mono blocks,which sounded just fine(driving my Avalons)required a dress code.Which was to wear nothing but a Speedo,even in the dead of winter,due to the rediculous heat output.....Sometimes one actually likes to be comfortable when listening to music.
My tube amp days were fun,but I would always use my tennis sweatbands,during long listening sessions.I am serious.Not really!!-:)You know what I mean.
As to the actual class D stuff..in all honesty,and of course only my opinion.....I have heard the Nuforce amps,and the Belcanto amps,as well.I was "extremeley" impressed with their sound quality.I,also,was sitting in comfort during the listening sessions.Of course I did not bring my son,the doctor's(had to slip that in-:)stethescope with me,to see if I could make out any wrong doings in the music.Whch sounded great,btw.
The future looks bright for these designs,and I could care less what a reviewer thinks.It is my own ears,and comfort that matter to me.
Best regards.
This conversation will be moot,in the not to distant future.
Also,with all due respect,why would a Hi Fi reviewer have any better ability to tell whether a product(of any type)is good,as compared to any other "music lover"?
In the sports world,or as a musician,one spends a great deal of time making themselves better than the average person,at their craft.I'd love to know how I can "pump up" my hearing,and improve it more-so than they already are.
Just a thought.
Phaelon,I should have said.."any music lover with a goodly amount of experience in this hobby".I have been at it 39 yrs,and most of my friends have been at it at least as long.
None of us subscribe to any particular system/product topology.If it sounds goo,it is good.
BTW,living in the tri state N.Y. area I have been fortunate to be able to actually hear quite a few personal set-ups,owned by reviewers I am sure you have read.To my taste(only an opinion)some sounded quite good,and some were absolutely dreadful sounding.
Btw,I DO understand your valid point,and am in no way trying to disrespect your posting.
Best regards.
PHD,I understand your point,and intent.I have no problems with this,and wish you the best.Please understand I am not arguing about specific match-ups,in a controlled environment,which a reviewer(and some lucky hobbyists,with extra dough)is privvy to.
I must add though,I have made the aquaintance of quite a few reviewers over the years.A few are still friends of mine.There is definitely a contingent of "some",sadly,who are hobbyists,and getting a break on equipment is what got them into this,in the first place.I do not meander too closely to these "guys".
Yes,some get paid(according to my sources, "on time" payment can be like pulling teeth,at times),but I don't believe it makes for the lions share of their income.Kudos to them,and I could not go through the constant swapping in/out of stuff.They are certainly patient,and dogged in persistence.
As to the better ability to make a judgement,as compared to the average audiophile....based on your "very good" arguement,I'd agree with you(in those specific circumstances),but I have heard more than a couple of set-ups(at reviewers' homes)that were not in the same performance class,as some of my "average" audio pals.Actually,they are quite experienced.
I mean NO disrespect!My particular tastes are unique to me(btw,I have been at this almost four decades)and I have learned that I want a particular "voicing" of the reproduction of music,in my given room,to sound a certain way.My way,for me.
Many of my audio group(some retired scribes)are adamant about hearing things,as they want it to "impress" their own tastes.I cannot tell you how often there is a disagreement,amongst them,with the "latest" rave,or even good review.It often totally contradicts a given reviewer.
Of course,I would not want to be without the benefits of reading good "responsible" reviews,and DO believe there are quite a few fine reviewers(my favorite being Srajan E. of "Six Moons"... He seemingly a very down to earth and responsible writer and I hope I spelled his name correctly).
Experience tells me to take a good review with a grain of salt,and auditioning something in person IS the only way to go.
Even you have seen,too many times,specific high profile reviewers(I won't mention who)go crazy over a given component(and yes,plenty of folks jump on these products,just from reading the review)and make mention of significant shortcomings suddenly noticed some months later.For whatever reasons.Money well spent,by the highly influenced purchasers?I was at an importer's home,after J.V. wrote the, well deserved, good review,of the Kharma 3.2's.He sold 19 pairs,that week,over the "phone".
So,with due respect(and believe me,I consider you someone to admire)I can't see anyone with a good set of ears,not using their own intuitive instincts, to make a buying decision,first and foremost,and being confident in their own decisions.
The reviewer's job,to me,is to point us in a direction he/she feels is the right path,but sometimes it won't jive with where we want to go.
warmest regards.
Sorry!Forgot to mention that companies like Nuforce allow for "upgrading" to new technology for reasonable prices.You are not going to have to worry about obsolesence with this type of policy.
As stated earlier,I don't own a class-d amp,but why shouldn't I be open minded to a good thing?The systems I have heard,employing them sounded just fine!
Best
While I have not A/B'd the "new" hi-tech "class-d" designs with any other amps,this discussion is becoming a bit silly.
The audiophile attitudes toward one's own particular set of "what one likes" should not overcome the "obvious",which is 1...Progress(like I stated earlier,this will not even be a discussion in the not distant future).#2...the fact that there is a growing contingent of music lovers who hear enough of Class-d's virtues to invest in them(they cannot be all deaf).3#...the arguement of the tube afficionados(of which I am one,btw)remains consistent,regardless of technological or performance improvements.#4...With the HUGE advantage of LOW heat(actually almost none),low cost,and small size one has to be really foolish to believe that a "matured" Class-d design(sounding great,by any standard)is far away.
As to obsolescence.....PLEEEEEASE!!!By the time a really good Class-d design is ready to get "dumped" by a particular owner(unless one is on the non stop merry-go round)what do you think the price of GOOD NOS TUBES will cost??Sort of makes up for the costs of new amps,almost!Based on the going trends!
BTW,I have no interest in buying anything,in the near future,but like to think I am open minded,and still have some pride in my current hearing!
My Tube loving friends have been almost militant about any other design formats.To my way of thinking it is their loss.