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
Hi Tim, moving right along.... My challenge of working on review projects with certain manufacturers is meeting with an occasional reluctance to share technical information.

As much as I enjoy ramblling about my own musical experience induced by the sonic performance of a device, I insist in the inclusion of a technical section containing a description of the solutions and unique design features adopted by the component. Such tech section is developed by integrating official information that the manufacturer has published, with further material that the designer has kindly shared with me for the public record, during the course of a taped interview. Needless to say, I refuse to include in an article any facts, factoids, or conjectures obtained from third parties, unless they have been openly and willingly corroborated on the record by the manufacturer.

Salluti, G.
Hi again Tim, here is yet a different solution that should prove to be quite musically satisfying on your MG2.7s…

A pair of Rowland M201 monoblocks based on ICEpower 500ASP. M201 is transformer-coupled and uses a regulated SMPS. A used pair is currently offered at an attractive price at:
http://app.audiogon.com/listings/solid-state-jeff-rowland-201-amplifier-2014-05-19-amplifiers-10010-new-york-ny

I recommend that you feed the amps through a single 750W Rowland PC-1 power factor corrected rectifier that you will find as one of the components currently offered by my good friend Matt:

http://app.audiogon.com/listings/solid-state-jeff-rowland-capri-s2-pre-amp-with-pc-1-2014-05-07-preamplifiers-07059-warren-nj

You should be able to persuade Matt to part from his PC-1 separately from the Capri S2 offered in the same ad.

M201 features and principles of operation are discussed in detail at:
http://jeffrowlandgroup.com/kb/categories.php?categoryid=6

There is lots of info on what PC-1 does for living at:
http://jeffrowlandgroup.com/kb/categories.php?categoryid=23

Note that to use M201 with PC-1, you will need to change the amps’ input voltage to 220V, as discussed at:
http://jeffrowlandgroup.com/kb/questions.php?questionid=519

M201 is transformer coupled like most other Rowland amps… By itself, it is a sweet-sounding amplifier, but it may not reach the subtlety of the higher end Continuum 500 and M312, because its SMPS is fed directly by grundgy and inefficient AC instead of the clean DC that reaches the SMPS of the latter amps…. PC-1 optimizes the efficiency of AC by realigning the voltage and current phases, then converts power into a 750W DC stream and cleans it further through a bank of caps.

Having listened to ICEpower amps fed with and without PFC rectifiers, the difference is significant. I expect PC-1 to add major harmonic density, microdynamics and authority to M201. You will need to get a “Y” output ombelical from Rowland… At a later time, you can add a second PC-1 for even greater authority.

Through a bit of price negotiations you might fit your budget… And get mono amps that not only sound very good, but also look fabulous with their sculpted chassis.

G.
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.
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