"D" amps, general discussion who's 1 and why?


There sure seems to be allot of continued "BUZZ" regarding "D" amps. I am reading more and more SET/Tube users and lovers actually recommending and using them.

So what are your thoughts.
dev
Dev, there's no sonic penalty for more power with Rowland. What speakers are you driving and how sensitive are they? 500/800 watts into 8/4 ohms may seem like overkill, but with speakers that need damping and control it's magical. Still, watts cost money.

Dave
Dev,

ICE makes the modules. Great amp designers, the ones who understand the principles of good basic conventional amp design, have the best chance making great ICE amps.

Henry Ho works out of Texas building his amps and preamps there. If you look at the picture of the inside of my amps on my system, you will see this is far from being a module in a box. The analog power supply is more than just a transformer and caps.

Jeff Rowland has a proven his metal designing conventional amps. There is no question he is the master of great looks.
Coffeey, have you done any direct comparison of any of these amps personally, if so which ones and what was you take good or bad.

I have read from others who have replace very well respected amps and a few who are SET lovers going this way which peaks my interest and I'm always open minded, if it works than it's okay by me.

Dcstep, it's really not the watts that I'm after there's more to it than that. This system I'm using MBL 101E's which people think are really hard to drive but what I have found doing research and personally experimenting with them that when in a room and loaded they are quiet easy to drive. I previously had a CAT 100 watt tube amp set-up with them with plenty of head room, I'm currently using them with 60 watt mono blocks which I just put in place for a hold over while looking for a replacement of the CAT's. I was not exspecting anything from these 60 watters and prior to installing them was wondering would these even drive them, well I am really shocked what they are doing and enjoying listening to my music.

Muralman1, I have seen your pics and viewed the inside of the amps which most defiantly look different than others but all I'm looking for is the end result. Have you done any direct comparisons to Rowland, Spectron, Bel Canto in your own system and if so what were your findings. I have not found many who flavour this specific line that you are using so more info. would be beneficial and welcomed.
Dcstep, the Lambda does not cause the speaker cables to hiss. It was definitely the cables. I have no interest in picking on Cardas. All cables that have more than a minimum of insulation talks. I can literally put my ear to my ribbons and hear nothing but music now.

Insulated cables hiss. Non insulated cables don't.
Dev, recall that I spoke to the dealer who was using the current model Spectron to drive MBL's in his personal system. I just looked up his name - Perrotta Consulting. According to his website, he reps, among others, the following amplifier manufacturers: Antique Sound Lab, BAT Balanced Audio Technology, Convergent Audio Technology, Copland, Creek, EAR, HALO by Parasound, Lamm Industries, Manley Labs, Mark Levinson, MBL, Plinius, PS Audio, VAC.

Considering the quality of gear available to him, there must be something special about the Spectron mated to the the MBL's for him to be using it. Maybe you could look him up in CT. Can't recall his first name but his number is 1-877-289-2014.
Yes i had Bel canto int,and also red Dragon mono blocks,yes they have good bass,but its not any better then decent solid state ,the highs were messed up and after lots of listening they just didnt work in my system,maybe it was because of my Legacy speakers,i dont know at first they wowed me,months later it was obvious to me that something wrong was going on here,did i hear it at first no,later on yes,it was actually a quite uncomfortable experience.
I'd say if you want to try these amps,look right here and buy used,if it doesn't work out sell and you wont be out the cash as if you buy new and then sell.
Jswarncke, thanks for the info. his name is Anthony, I actualy know him and we communicate often but he has never mention such to me that he uses Spectron amps which is strange. I'll be giving him a ring.

Coffeey thanks for the input, I have not seen any latest version Spectron mono blocks come up for sale used period, nor JRD 301 mono's or the newest version Bel Canto's MKII's which would be due to them just being too new. I tried class "D" before if you read back my threads and the experience was not favourable but there seems to have been advancements since then and I'm never closed minded.
Thanks i'm not bashing anything,there is no doubt they have big potential,and if they do overcome some of these things,like being more compatible with more systems,there's no reason to think they wont be outstanding,but they have a ways to go.I know there's system snergy but some of this stuff shouldn't have to be so system dependent.
Muralman1 said:

"Insulated cables hiss. Non insulated cables don't."

You mean, in your system, I'm certain.

Dave
I had been talking about my system, yes. Mind you, it is not my system that is
causing the insulated cable hiss, non insulated cables do not hiss.

Honestly, I don't know why anyone would pile money into cabling. My house is
open to anyone wanting to see for themselves how insulation causes capacitance
white noise.
Saranwrap of course. Look at his system.

Ribbons can actually act as antennas. He's concerned with insulation (rightfully) yet uses antenna for speaker cables in an strong RFI/EMI environment.

He may make it work, but it will likely be a reactive system, particularly to digital devices, which he has stated that it is.

Dave
Anticables work extremely well with the latest Spectron amps, used as monoblocks. I'm biwiring Vandersteen 5a's, using 4 anticables per side. Very quiet background, very musical.
Dcstep, quit chewing on my leg. There is no RFI/EMI environment around my audio gear. The ICE module's radiation is minimized by B&W and the H2O's very heavy barriers do the rest.

If you notice, I am also using 6 ft. of Speltz ICs to reach the amps. They too have the skimpiest of shielding just designed to prevent shorts. My ribbons are only 18" long. Yes, it is Saran Wrap. The plastic touches the metal only barely. It works.

You see, no worries. You are thinking of another class D amp that is famous for polluting.

Reactive system? It is an honest system. Class D amps require rethinking the rules.

When I was running huge Pass Labs monos cabling made no difference.
Muralman1, we're just talking about Class D, RFI/EMI and cables, so why should your leg hurt?

Given your choice of antenna for speaker cables, you're wise to keep them short and away from the digital sources. B&O doesn't do a particularly great job of minimizing RFI/EMI, but your H2O likely makes up for that. Almost certainly your CDP and DAC are leaking RFI, so balanced ICs are wise in almost every system, particularly those with relatively long IC runs, like yours.

"Reactive" because you stated a high sensitivity to insulation on cabling.

I generally agree with everything you say, but don't find your system's sensitivity to cable insulation to be universal to Class D, that's all.

Dave
Dcstep, Unlike me ;D, my system is very very sensitive to everything..... especially criticism :D

My Scintillas have 40 feet of gossamer light naked ribbons. And they just do HF. The highs are audibly infinite. In conjunction with my H2O amps, twice improved, I have Henry Ho's Fire preamp too.

I like the NOS Audio Note DAC for it's purity. There is no filter software messing with it.

Tube changes, cable changes, speaker placement, are a devil's playground. I think I just lucked out.
i have auditioned two versions--the nuforce 9's and the raptors. both amps retail for about $5000. they remind me of a typical transistor amp. they are capable in the region below 200 hz and are deficient above 200 hz.
Well said Muralman1. Ultimately, the owner's satisfaction is most important and you've apparently acheived that.

Dave
This hobby is so subjective and system dependent that individual opinion, whether it be from a casual user or even professional reviewers, is almost useless. The handling of The Absolute Sound's reviews of the NuForce 9SE "Amplifier Of The Year", its inclusion in their class D shootout, and recently the 9SE v2, is a wonderful example of subjective audio opinion and editorial disagreement.

Compared to my linear solid state and tube amplifiers class D amplifiers have taken the most effort to integrate into my system to enjoy their full potential and an understandable reason for many of the negative experiences. I'm personally very skeptical of any reference of class D amplifiers sounding tube like. While there may be certain areas were the two may reach a similar timbre their general presentations are different. You like the sound of tubes, buy a tube amp.
This months The Absolute Sound has a review of Nuforce Ref 9 SE V2 amps that Chris Martens gave a very positive review of.

I have been using these class d proprietary amps for quite a while. I took my standard Ref 9 of almost three years ago through Nuforce upgrade plan to SE then V2. The upgrades being very reasonable and well worth the small price for the latest technology IMO. The first version to my ears did not have the problems that Martens refers to in the new review, he did the original ref 9 back in TAS issue 158.

Nuforce like most audio companies offer an in home trial for system matching.

My system with class d powering it has won over my doubts with superior sound and total musical enjoyment. I am not pushing these amps just giving my experience with class d.
Vicdamone did not intend to double up on what you have said. I wrote the post and got side tracked for awhile then made the post with out going back to the thread.

Your response tells it like it is. Its also true that not all like milk in there coffee.
Hello Dev,

"Sbank, there are few that have gone from Tube amps to specifically Spectron amps latest version. There is a lengthy but very good review on Audiogon from one owner and the amps he compared to which are very respected, there are others also and this is why these have peaked my interest and want more thoughts from others regarding this..."

I am not sure if you mean my review where I compared Spectron (positively) with VTL Sigfrieds but if its true I heard other tube amplifiers since.

While, I will not take a "penny" from Spectron - its good amp, there are few OTL amplifiers which lead you directly to heaven. I mean Athma-Sphere and Joule-Electra, and to ask which is better its the same as to ask who is the better painter Susanne or Degah (spelling is bad?).

I will rephrase: do you prefer hi-res photo portrait or the paintning by TALANTED artist which can look into the soul of individual. I know my answer.

All The Best
Rafael
Well, with a name like "Rafael" (the great Italian artist), we'll know that you're more into interpretation than "accuracy." There's nothing wrong with that, BUT, I predict, if you love Atma, then you'll not be happy with Spectron or Rowland.

I'm from the other school, but I know where you're coming from.

Dave
Hi Dob,

yes it was your review I was making reference too.

I have to say when you refer to saying "I know my answer."

I whole heartily agree and we seem to be in the same camp so which is it? of these two fine products Athma-Sphere or Joule-Electra?

My thought is your answer lays with Joule because I have heard from many describing like you have but could be wrong, I have been told that I should be trying their mono blocks.

You should do another review with details of your outcome of the amps and differences you found. I heard a specific person whom allot know (not naming just encase for now) will be joining their team to assist in enhancing their product specifically the new pre-amp, should be interesting indeed.

What speakers are you using currently.

Dcstep, do you feel that the class "D" gear Rowland and Spectron are lacking in offering how Dob put it "the painting by TALANTED artist which can look into the soul of individual."

What are your thoughts of other Rowland gear compared them directly to their class "D" product we are specifically talking about. Do you prefer it over all over other Rowland products and if so why.
Dev asked:

"Dcstep, do you feel that the class "D" gear Rowland and Spectron are lacking in offering how Dob put it "the painting by TALANTED artist which can look into the soul of individual."

What are your thoughts of other Rowland gear compared them directly to their class "D" product we are specifically talking about. Do you prefer it over all over other Rowland products and if so why."

I don't consider the Rowland or Spectron "lacking" in anything. When your sources are excellent, then the musical experience will all the soul that could be desired. Some audiophiles prefer a slightly euphonic delivery. As a musician, I prefer accuracy, which excludes unrealistic hardness or edge.

If you're asking me to compare Rowland to Spectron, I can't say anything further than they're both excellent and of the same philosophy. I've heard them in different systems and liked them both very much. Both are transparent and clear with effortless dynamic and no sonic signature. I have no temptation to move to Spectron, but if I needed more clean, accurate power, then I'd look at the Spectron first.

I'm not sure that I understand the second part of your question. I'm only familiar with Rowland's more recent products, like the Continuum 500, 312, Capri, Critereon, 501, 201 and 102. I've read where some thought that older Rowland products had a slightly "warm" delivery. That's not true of the current crop, IMHO.

Dave
Dcstep, thanks for your response.

Regarding the Rowland gear I was just wondering if you had personally heard any of their earlier designs for example 9Ti mono's and what your thoughts were in comparison to the latest which you answered.

Class "D" product is very interesting, I look forward to personally having a listen to some of these pieces especially the latest designs to see if the improvements change my past listening experiences which I had aprox. a year ago.

Hello Dave: Never make assumptions. I own a pair of Spectrons with all upgrades ($21k retail). Good amps. I heard a lot about your Jeff Rowland ($9k) and I am well familiar with Rowland 312 ($14k) - you probably can add new Bel Canto Ref1000 Mk2 ($6k/pr) but I will wait Kal's review and then I will add it to the list of 1st class - class D amplifiers

...and then I spent a week in Canada and friend of the friend owns Joule-Electra Rite of Passage and big MBL speakers. I spent a large number of hours , almost every day, in his listening room. I will not tell you how accurate was this or inacuracte was that (I am professional cellist) - frankly I did not give a ... I knew I can't stand, I can't leave, I can't stop listening to the music. It was increadibly REALISTIC representation of REAL music. I am like a dog - I can tell you what I hear, I can't explain why (I did not hear euphonic even order or other kind of distortions, sorry)

Joule-Electra's web site is a bit neglected so you have to do your own research..... and you will discover that his "equipment" was reviewed time and time again by Harry Pearson of TAS, David Robonson of Positive Feedback and such, that he has many prestigeous awards etc etc.

So at first I thought that I am insane but now I know that I am only poor. I can't afford big MBL with Rite of Psssage.

I suspect that you want to say that I was hearing effect of MBL. Its true but I heard to these great speakers with so many solid state amps (including MBL) that I know that I heard - I heard "magic" pure and simple "magic".

So, Dave - let us enjoy good amps we own but please let me dream about listening to REAL music or....its SOUL

All The Best
Rafael
Dear Dev, Please see above in my response to Dave what I heard in Joule-Electra power amp. To your amin question: Yes, we all heard about new upcoming killer preamp from Joule-Electra and I know personally the gentleman who you mentioned. My current preamp is REX by BAT, truly excellent preamp. However, in a few days I will be receiving new Joule-Electra flagship preamp - I never heard it, I got it only upon recommendation of this person - and he did only excellent recommendation (so far that is).

If ths preamp has some family resemblance to Joule-Electra power amps I expect to be in heaven...

I will let you know and if I will like it... I will write serious review.

Thank you and all the best.
Rafael
Dob, very interesting indeed. What did the rest of this system consist of that you heard with the MBL's and I presume when you refer to big MBL's they are the 101E's, same speakers I own. I really enjoy my MBL's and every amp combo I pair up with them I learn new things even with the amps presently in place which are just carry overs from my CAT JL3's until I find replacements.

Does this same person also own JMLab Focal Grande Utopia BE speakers (MSRP: $99,995) may have sold them by now. Black piano, wood floors in the living room, Teres table.

Look forward to your thoughts of the Joule pre., from what I have heard suppose to be a real gem.

"11-28-08: Dob
Hello Dave: Never make assumptions. I own a pair of Spectrons with all upgrades ($21k retail). Good amps. I heard a lot about your Jeff Rowland ($9k) and I am well familiar with Rowland 312 ($14k) - you probably can add new Bel Canto Ref1000 Mk2 ($6k/pr) but I will wait Kal's review and then I will add it to the list of 1st class - class D amplifiers"

What happens when Kal reviews a product?
Dob, I am curious did you run a tube pre-amp with your Spectrons?
I find running a tube pre into the Spectron gives it that naturalness without losing that effortless, clear sound which is it's forte.
IMS the synergy is excellent you get the best of both worlds. Just my 2 cents YMMV.
Dear Dev,

I did not see any other "big" speakers. If you can try Joule-Electra (or powerful Athma-Sphere)it could be interesting experience for you. While Joule Electra list Rite of Passage as theirt most power amp (200 watts), they have even more powerful, Destiny - 300 watts per monoblock and as far as I understand they have all specs and looks identical to Rite of Passage but have 4 tubes more..

Vicdamone: "What happens when Kal reviews a product? " Not much, I am afraid - simply I give more weight to the rumors and writings about the product and sometimes I will go to do serious audition myself if I need this type of equipment. I do respect a few reviewers, Kal is one of them.

Dear Snopro. Yes, I fully agree with you. I have now REX by BAT - very good preamp. Simply I expect more from Joule-Electra "Marianne Electra Memorial Edition Preamp"..I will see.

All The Best
Rafael
Seems I found this thread a little late in the game. . . oh well!

In answer to Steidlguitars. . . you are historically correct. It is IMO only in the last couple of years that several class D implementation have left behind some of the idiosyncratic behavior of class D and are in fact exposing the intricacy of harmonic decay in a manner that I deem astonishing. My very preferred devices have already been mentioned here: Rowland 312 and C500, Bel Canto Ref 500/1000 Mk.2 series, recent Spectron Musician 3 implementations.

Coffey is also correct in his cautionary opinion. . . I have listened to the Red Dragon Leviathan twice now at RMAF. . . and I have hardly ever listened to that much intermodulation distortion coming from any system, with amps of any class. I suspect that class D may be no panacea for ensuring quality sound.

G.
I'm still a big fan of PS Audio's HCA-2 especially for what it can be had for at current used prices. It uses an analog power supply (highly desirable and has only two gain stages (no B&O Ice Modules here). It was a Stereophile Class A product when first conceived and trounced Bel Cantos effort at the time. One pro reviewer stated that many digital designs will follow the HCA-2 but they will not have the quality & effort that was afforded this amp.

To the point there is an upgrade targeted for the HCA-2 that invlolves replacing the four input caps with Black Gate capacitors. It has been mentioned in the forums that this upgrade is the most desrable & cost effective for sound improvement. I personally own a HCA-2 with this upgrade and will tell you it sounds spectacular. Extended but refined highs, a gorgeous midrange approaching tube magic and killer bass. Also this upgrade opens up the soundstage and yes I previously owned the stock unit for comparison and other new digital amps.
I’m finally taking the time to put my two pennies on the board. I want to share my discovery with fellow audiophiles in cyberspace.

Not long ago, I purchased Wyred4Sound stereo amplifier (200S – 125 watts output). I have been hearing so many good things about D class amplifiers. I decided to give it a try. After a long research, Wyred4sound caught my attention not only because the company works with PS Audio, but also it is one of premier custom modifications centers in the country, if not the world.

My budget was limited at the time, so I purchased the stereo amp. When the amp finally arrived home double boxed, I could not believe how light and small the amplifier was. The small size was very much welcome after a long time dealing with my 100 pound Krell amp. The primary reason for such small size is the amp’s state of the art ICE technology. The overall feel and quality of parts was well above the amp’s price point.

I was excited to hear what this little amp could do. I popped in a “Cowboy Junky” cd. All I can say is “! WOW!! WOW!! WOW!” I could not believe my ears on how good it sounded right out of the box.

After about 300 hours or so the amp really warmed up. I can safely say that ”the amp gives a tube like sound”, but with a lot more authority. The bass was strong and detailed. Many tube amps lack that authoritative bass. The amp has the speed and resolution of a solid state amplifier that would cost three to four times as much. I really don’t see anyone going wrong with Wyred4Sound amps.

This amp has that special something that most of audiophiles are looking for - its “musicality”.

Do yourself a favor and audition one of Wyred4Sound amps. I assure you, you will not be disappointed. From what I have been told, the more powerful mono amplifiers sound even better.

If you are considering purchasing a class D amplifier take a look at the Wyred 4 Sound amplifiers. Nothing comes close to these amplifiers at the current price.

www.wyred4sound.com

http://www.positive-feedback.com/Issue39/wyred4sound.htm

Speakers: Usher – 6371
CD Player: Jolida – JD 100 (RCA Tubes)
Preamp: Cary – Tube
Amplifier: Wyred4Sound – 200S – FET – No Op-Amp
Power Cables: Morrow - MAP2
Extra Power Cables: Shunyata - Diamondback
IC: DH Labs – Revelation – Silver Core
Speaker Cable: Clear Day – Silver Core
AC Receptacle: Oyaide SWO-GX
Electricity: Dedicated 20 Amp. Power Line & Ground (16 foot Copper rod)
Spectron,Rowland expensive as they are doesnt mean better sound quality at all ,dig up a copy of hi fi plus,there's a summary somewhere here on agon,it gets right to the point,class d wows at first after that it gets ugly.
Ugly Huh? I must have very bad earwax buildup. . . the more I listen to my class D JRDG 312 the more I like it. . . or may be it's in those bad recessive genes of mine. . . who knows! (smiles!)
Coffeey, why would anyone dig up a copy HiFi Plus to see how class D sounds? Listen for youself and listen to the latest generation. Those guys are way behind the curve.

If you don't trust your own ears, then it won't matter what you buy or listen to, will it?

Dave
Coffeey, I fail to see you have the experience to make such a sweeping generalization.
The bottomline Coffey, is that unless you had the opportunity of listening at some length to at least a couple of well broken in examples of the more well regarded / advanced class D amplifiers on the market today, you won't have any idea if these devices are for you or not. Try a careful listen to at least 2 or more of the following: latest H2O monos, Spectron monos with all the upg, Bel Canto Ref 500 Mk.2, Bel Canto Ref 1000 MK.2, JRDG 312, JRDG Continuum 500, JRDG 501 monos with a PC1 on each monoblock. . . . . In the end, at least you will have formed a reasonably educated opinion. about some significant examples in the current state of the class D art.
I listened plenty long to both Bel Canto and Red Dragon,and guess what at the end it was ugly and unmusical,and frankly made my skin crawl,so dont give me the part about not listening.
Coffey, I empathize with your experience with Red Dragon Leviathan. . . I suspect this device may not be quite representative of the state of the class D art. Conversely, on the subject of Bel Canto. . . it's a brand, not a device. Unless you have auditioned at some length the Mk.2 versions of the Ref 500 or Ref 1000, you may have heard obsolete models that sound to all accounts not quite as refined as the new ones.
Which Bel Canto Coffeey? Even in an otherwise limiting system at this year's RMAF I could hear a lot of promise. Were you comparing to your Counterpoint? Of course Bel Canto isn't near the top of the ICEPower heap, but it shouldn't make your skin crawl.

If your skin crawled with the latest Bel Canto, then I expect that there was something wrong with the system.

What aspects made your skin crawl? That's a pretty broad dismissal, said with a certain degree of authority that would imply that you know what you're talking about, so why not share some details? Maybe, as little as listing the other system components and where the audition took place. Were there any comparisons made? Were the components in balanced mode?

I haven't heard the Red Dragon, but I'd worry about the wooden chassis and sheet metal chassis not delivering the isolation from EMI and RFI that ICEPower needs. Those are pretty expensive units in a very basic looking chassis.

Dave
I have been a tube guy for a couple of decades but after demoing and then moving to Spectron amps - from stereo to mono block there can never be any doubt I made an improvement in my enjoyment of my rig. Now, there are lots of good SS, Tube and class D amps and similarly lots of overpriced but well hyped but not great gear. For me the bottom line was that the Spectron class D amps removed a veil that my previous tube amps had and also class D amps seem to have the speed and cadence to ensure that all of the signal reaches the speakers at the right time. Hard to define but easier to hear.

There are a bunch of great amps that I would be delighted to have in my system (assuming appropriate synergies) and I could name a short list of SS, Tube and Class D. My point is that circuit design, good board topography, effective procurement and manufacturing can deliver a great product, or not, so the best class D will sound superb and the poorly designed class D will sound like crap and the same goes for tubes, SS etc. etc.

Bel Canto, Rowland, Spectron are all great products.

My rant ends with the principle that system synergy ends up defining the quality of final sound - and most likely a product of electro-mechanical parameters.
"best class D will sound superb and the poorly designed class D will sound like crap and the same goes for tubes, SS etc. etc."

Thank you Radical. . . couldn't have said it more eloquently myself (grins!)
The review of Nuforces Ref 9 SE V2 in Decembers The Absolute Sound is a good example of how Class D has evolved. A very positive review by a first rate rag.

I have been on this ride from the beginning with Nuforces class D amp, my first NF Ref 9 of three years ago. The latest version V2 like i suspect of most class D amps mentioned above is far superior to the first versions of these super revealing amps. The truth is these amps are so revealing that if the rest of your system is not up to it you hear the weakest link and its not the amps.

What i dont understand is the wasted time on advising something to someone who like a lot of others i have encountered on this subject who just like to pick and make statements with out any merit. As for Coffeeys negativity who cares i know i dont. We are free to buy and enjoy what we like.

I dont know about other manufacturers of these super amps but in Nuforces case upgrades are offered to there customers. You are not stuck with the old and can easily move up the the newest technology. As good as that business sense is the real reason for my owning these class D amps is they take my system to levels i thought not possible with power, speed, clarity and hours upon hours of music with out fatigue.
I have owned the Gilmore Raven Stereo Class D amp and I have just traded it in for a pair of the Gilmore Raptor monoblocks. I auditioned the Raven against the Nuforce 9 SE v2 and it was far superior in my system (Supratek Chenin tube preamp, Zu Druid Speakers, Zero One Mercury CD-HD player). The Nuforces caused audible interference with my Suprateks, I could actually hear the hum from my listening position. Since others have not seemed to experience the same, all I can say is that the implementation of class D is highly dependent on the rest of your system. My system could not stomach the Nuforce's switching power supply and it's resultant RF noise, the Gilmore's linear PS was a much better match - your mileage may vary.

I have moved to the Raptors since I have recently changed my speakers to vintage Infinity RSIIb's - they need a LOT more power than the Druids!
Ait your quote

"Since others have not seemed to experience the same, all I can say is that the implementation of class D is highly dependent on the rest of your system"

This is why most manufacturers and dealers have gone to a in home audition. I tried different pre amps with my system including Nuforces P-9 and it took the tubed Audio Horizon 2.1 to create the magic sound i was looking to hear with my system.

I am happy for all who can get sound that blows there skirt up and makes there ears happy no mater what gear is used. Good for you Ait way to tell it like it is. I'm sure thats why there so many manufacturers with so much gear available thats making a living in this hobby.

Variety is the spice of life.