HYPEX,PASCAL OR ABLETEC


Knowing about the many apparently very good class D amps on the market right now and even though I'm very satisfied with my current ClassD Audio SDS-440CS amp, I'm seriously considering purchasing one of these amps to try out in my system. My thinking is that, if I do like the amp in my system, I can just use my current amp to replace an older Adcom GFA-545 that currently powers my Magnepan CC3 center channel and my unamplified (passive)sub for ht purposes. I would then always be able to choose which amp I used for my 2 ch music and which amp I used for ht(cc and sub).

Well, I should get to my point:

I'm using an Oppo105 as the master source in my streamlined A/V living room system used 40% for 2-ch music and 60% for ht. For 2-ch listening, I stream my cd collection and hi-res Flac files from a Synology NAS in another room to the Oppo. The Oppo acts as a stand alone dac and sends the analog output via xlr cables to my class D amp (440 w/ch@4ohms) which powers my Magnepan 2.7qr speakers. For ht, I use the Oppo for decoding surround sound from Netflix, Directv and bluray discs. Two class A/B amps power the Oppo's ht audio outputs to my Magnepan CC3 center channel, LFE sub and in-ceiling rear surround channels.
I've narrowed my new amp choices down to the following four listed below. I'm requesting feedback on any or all of these 4 amp options, especially from anyone who has used 1 or more in their system. My budget is $2,000 to $2,500 and my room is 18ft x 13ft with 8ft ceilings. Here are my options:

Option#1 Hypex Ncore nc400 based amp builds from James Romeyn in Utah. A stereo, dual-mono build is $1,500 total and is rated at 400 watts @ 4 ohms. It includes 2 Hypex nc400 power modules both powered by 1 nc12000 smps mounted in a generic case with a black or silver aluminum faceplate with both se and xlr inputs. A pair of mono-blocks built runs a bit under $2,000/pr. total and consists of a nc400 power module mated to a nc600 smps in each 'NCORE' labeled black case with both se and xlr inputs.

Option#2 Pascal amp build from Aluminati Sound in Ohio. This is a stereo build only that will use a new stereo board from Pascal in Denmark, called the SPRO-2, that has a smps incorporated on the board. Power output is rated at 500 watts/ch @ 4 ohms. Forecasted price is about $2,000 but may run a bit higher. Pascal modules are used in the new JRRG Continuum 2 integrated amp that has received very positive sq reviews. Alumnati is owned by 2 former CNC machinists/fabricators. Their main advantage is their case work. One of the Aluminati owners, Matt Kraemer, told me the new stereo Pascal amp is tentatively named the "X-1" and should be available for order by approx. mid July. He said the stereo case will be milled from a single large aluminum block. The finished case will have an anodized finish (think JRRG cases but milled as 1 solid piece instead of multiple anodized face panels attached to a chassis underneath. The aluminum case will have a blue power/status light mounted underneath projecting downward.

Option#3- Abletec amp modules in the DSonic M3-600M mono-blocks. I'm not certain which Abletec modules are used in these amps but the price is $1,950/pr. and power output is 600 watts/ch @ 4 ohms in black cases with a blue power/status light with both se and xlr inputs. The Abletec modules have built-in smps just like the Pascal modules. According to DSonic's owner, Dennis Deacon, the 600Ms and their top-of-the-line 1500Ms have similar sound characteristics, even though the 1500Ms use Pascal modules(likely either a MPro or XPro module).

Option#4- Identical ClassD Audio SDS-440CS amp to replace my older class A/B amp that powers my center ch and sub. This option is least attractive to me since it would mean my music amplification would remain the same and I wouldn't be auditioning any of the newer class D amp modules. If I liked option 1,2 or 3 above better for music playback, I would simply move my existing CDA music amp over to center and sub duties anyways. The only benefit of option #4 is that it's the least expensive at $630.

I've ruled out some amps, like the Wyred4Sound and Red Dragon offerings, because they use the older Ice ucd power modules typically considered sonically inferior to the newer Hypex Ncore, Pascal and Abletec power modules. Any comments comparing the sq of these options is greatly appreciated, especially if you've owned or listened to some of these. I do understand that there is more involved with how various class D amps sound than just the power modules utilized, such as high quality components and custom input stages.

I should also say, just like Audiozen, I have never actually heard a Hypex, Pascal or Abletec powered amp. I'm just curious and base my optimism on the positive reports from owners, listeners and professional reviewers. If I had a larger $10k plus budget, I'd likely just buy a completed amp based on the Hypex Ncore nc1200 power modules, such as Merrill, upcoming Mola-Mola or Acoustic Imagery.

Thank you in advance for your thoughts, comments and suggestions. Please feel free to suggest other reasonably priced class D amps I may have omitted.

Thank you,
Tim



Much like Audiozen, I am basing
128x128noble100
Guido,

I have no qualms with your reviewing guidelines regarding technical information or insistence on manufacturers' corroborating any information before inclusion. I've read several of your reviews and consider them all very well written, professional, informative, well articulated and overall very enjoyable to read.

My main point was that I would think PFO is in a precarious position when deciding what products to assign for review. I want to preface my following comments by stating I have very little knowledge of the process editors use when deciding what products they choose to review and any constraints they encounter or perceive when doing so. My comments are based only on reason, logic and common sense and without any specific knowledge or insight from any source.

From this perspective, I was contemplating why there is such a consistent lack of reviews comparing the performance of various class D amps against each other. For an example, let's say an editor is considering a larger scale review comparing, as chance would have it, the following amps:

MerrillAudio Veritas mono-blocks using Hypex nc1200 power conversion modules.

D-Sonic M31500M mono-blocks using the discontinued Abletec ALC-1000 power conversion modules.

James Romeyn assembled stereo amp using a pair of the Hypex nc400 power conversion modules and nc1200 smps.

Aluminati Sound X-2 assembled stereo amp using a single Pascal SPRO-2 power conversion module

Technical information on all power conversion modules would be aupplied by Hypex, Abletec and Pascal.
Amp features and technical information would be supplied by Merrill Audio, D-Sonic, James Romeyn and Aluminati Sound.
Given the above, my thoughts are:

If either Merrill or D-Sonic advertised with the editor's print or online publication, he may not assign such a review if he thought there was a strong possibility of either of the assembled amps from James Romeyn or Aluminati Sound outperforming the Merrill or D-Sonic amps. Whether either OEM amp company would actually cease their advertising with a publication due to being bested by an upstart assembled amp is debatable and probably irrelevant. Even the editor's perception that this could ensue may be enough to cause him to nix the whole review.

In no way do I think PFO is unique in this regard; the other online and printed audio magazines may also avoid these types of reviews for the same reasons. Ultimately, however, the only indication of my theory being correct is the complete lack of this type of comparative review existing on any online audio site or in any printed audio medium I know of.

I may be all wet with my thoughts and just frustrated with my lack of success finding comparative information online about these various power conversion modules. I am just very curious why there is such a lack of information on this very obvious subject for a thorough review. The only information I've discovered is anecdotal and usually on audio forums, such as this one, from individuals who have no financial incentives, or disincentives, causing them not to respond or not to report honestly.

Just my 2 cents,
Tim

Hi Tim, if you have questions or suggestions for PFO editors, you can send your email to:

mailto:drobinson@positive-feedback.com

G.
I would really like read a comparison (better yet: do my own) of the Ayre AX-5 and the Rowland Continuum S2.
That's easy, Dan. Just pack up your Ayre and come on over. I'm retired now. Plenty of time to accommodate an audiophile friend. And you would have the opportunity to hear my horns.
In recent years, a handful of class D engineers have scaled to the same level as Bruno Putzeys, since they all have accomplished the same thing, and that is correcting the inherent problems that has plagued Class D amps since the 1960's, and that is PWM/Pulse width switching modulators that always had harmonic disorder problems and linear problems, which is why Class D amps years ago had cold upper frequencies, especially with violin and piano, and flabby bass. But always have had that great, rich, lower midrange. The following companies in recent years have all abandoned PWM switching modulators
and have designed in house their own patented switching applications that have eliminated the problems with Class D amps. Those companies are, B&O, with their current MK-III version HCOM modulator which is used in their most recent amps. Nuforce, Audio Research,
Hypex/Ncore, Anaview, with their Phase shift modulator and AMS technology, and Pascal. There is one Class D product that has left me breathless during the past several months which I have listened to, and that is the Peachtree Audio Grand X-1 integrated Class D amplifier with a hybrid tube preamp section designed by legendary circuit engineer Bascom King who is now 74. His resume spanning fifty years is remarkable. Bascom also does design work for Wyred 4 Sound. The X-1 uses two bridged B&O 250ASX2 amps. Two Psvane 12AU7 tubes are used in the buffer stage and can be turned off or on via the remote while listening to have the option of solid state or the tube buffer when needed. The amp puts out 440 watts @8Ohms and 770 watts @4Ohms and can easily drive loads down to 1ohm. It has a full, rich, meaty sound with tight fisted bass performance that will crack your skull. It has the best damn DAC on the planet, the ESS Sabre32 9018 Reference which has jitter master clocked down to one picosecond. Incredible. A close friend of mine picked one up over the Christmas holiday and it is extremely enjoyable to listen to. There are many other features including a killer headphone amp that make the X-1 and absolute steal for $4500.00.
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