verdict on class D amps?


I saw a thread about seymour ice amps.... anyone have any experience with these compared to conventional amps? I was planning on picking up a used pair of bryston 7st or a single 14 st however for similar money (& power) the new ice 50001 is available. In car audio there it doesn't seem like class D is very good except for sub duty. Is the same true for home stuff? Presently I have a adcom GFA5500 which was going to get thrown on rear surrounds & I was going to use parasound HCA1500 on my speakers untill I can afford something newer/better for my old infinity kappa 8.1 speakers

thanks
viggen900

Showing 11 responses by kijanki

Guido - that is an important distinction. Many people object to principle alone (switching) not understanding that time can be as analog as frequency or voltage. They probably already have CD players or DACs with delta-sigma D/A converters, SACD players or DSD recordings - all of them class D like (PWM).
Jaymark - that was my impression. SS integrated, I had before class D amp, sounded in comparison "brassy". I'm not sure, with my limited experience, how best amp should sound, but I have very liquid smooth sound now. Sibilants, I had before, disappeared and clarity/transparency got better. One thing I noticed was that sound got leaner at lower midrange. I replaced speaker cable (AQ Indigo) with better one (AZ Satori) and the lower midrange got much fuller.
"Can someone list a few different manufacturers of class D/T amps that I should consider?"

Acoustic Reality www.acoustic-reality.com/
eAR202, etc (ICEPower)

Aivin www.acoustic-reality.com/
DT300 (www.acoustic-reality.com/) (Tripath)

Analog Research Technology www.acoustic-reality.com/

AudioArt (NL) www.acoustic-reality.com/
Van Medevoort MA240 (Hypex UcD)

Audiodigit www.acoustic-reality.com/
MC 8x100 (Tripath)

AudioResearch www.acoustic-reality.com/
150.2, 300.2, 150M (Tripath)

AV123 www.acoustic-reality.com/
X-Empower, xAmp (prelaunch (www.acoustic-reality.com/))
(Philips class-D?)

B&O www.acoustic-reality.com/
(ICEPower)

BelCanto www.acoustic-reality.com/
Evo (Tripath) eOne (ICEPower)

Bertram www.acoustic-reality.com/
(ICEPower)

Carver www.acoustic-reality.com/
300.2, 700.2, 1200.2

Cary Audio www.acoustic-reality.com/
A 306 power amplifier (www.acoustic-reality.com/)

Channel Islands Audio www.acoustic-reality.com/
D100, D200 (Hypex UcD)

Chapter Audio www.acoustic-reality.com/
Couplet Power Amp (proprietary WMP class-D)

D-Sonic www.acoustic-reality.com/
Magnum (www.acoustic-reality.com/) (ICEPower)

DIYCable www.acoustic-reality.com/
Exodus (www.acoustic-reality.com/) (Hypex UcD)

Egosys www.acoustic-reality.com/
Audiotrak DrAMP (www.acoustic-reality.com/) (Tripath)

Elan www.acoustic-reality.com/
D1200, D1600 (12 and 16 channel power amps, Tripath)

Electronic Visionary Systems www.acoustic-reality.com/
EVS-2 (www.acoustic-reality.com/) (ICEPower)

Flying Mole www.acoustic-reality.com/
(proprietary class-D)

Gilmore Audio www.acoustic-reality.com/
Raven, Raptor, Dragonfly (www.acoustic-reality.com/) m/ch (looks like ICE)

Halcro www.acoustic-reality.com/
Lyrus

H2O Audio www.acoustic-reality.com/
M250, M500 (ICEpower)

Integra /Onkyo www.acoustic-reality.com/
DTA 9.4 (www.acoustic-reality.com/) 7x120W 8Ω

Jeff Rowland www.acoustic-reality.com/
(ICEPower)

Jjaz Audio www.acoustic-reality.com/
(ICEPower)

Kharma www.acoustic-reality.com/
MP150 (www.acoustic-reality.com/)

LC Audio www.acoustic-reality.com/
Predator SE (www.acoustic-reality.com/) (ZapPulse)

Marantz www.acoustic-reality.com/
Opsodis ES-150 (www.acoustic-reality.com/) (D2Audio) 2ch virtual surround

Medius [DK] www.acoustic-reality.com/
A II, A III (www.acoustic-reality.com/)

MG Audiolabs www.acoustic-reality.com/
Symphony (www.acoustic-reality.com/) (Hypex UcD)

Midgard Audio www.acoustic-reality.com/
(ICEPower)

MindCraft (NL) www.acoustic-reality.com/
Media Amp One (www.acoustic-reality.com/) (Hypex UcD)

Murano-Audio (TW) www.acoustic-reality.com/
P500, P1000 (ICEPower)

NHT www.acoustic-reality.com/
Power2 (www.acoustic-reality.com/), Power5 (www.acoustic-reality.com/) (ICEpower)

Nuforce www.acoustic-reality.com/
Ref 8, Ref 8b, Ref 9 (nPhysics proprietary class-D)

NuVo Technologies www.acoustic-reality.com/
NV-P2100 (www.acoustic-reality.com/)

Onkyo www.acoustic-reality.com/
A-1VL, A-9755, A-9555 (www.acoustic-reality.com/) (?)

PSAudio www.acoustic-reality.com/
GCA, GCMC (ICEPower)

Red Dragon Audio www.acoustic-reality.com/
(ICEpower)

RedWineAudio www.acoustic-reality.com/
Clari-T, Lotus (Tripath)

Rotel www.acoustic-reality.com/
1077 (7x100), 1092 (2x500) (ICEPower)

Sharp www.acoustic-reality.com/
SM-SX1, SM-SX100

Sonneteer www.acoustic-reality.com/
Brontë (Tripath)

Sony www.acoustic-reality.com/
TA-DA9000ES, TA-FA1200ES (www.acoustic-reality.com/) (S-Master)

Spectron www.acoustic-reality.com/
Musician, Troubador (int amp w digital inputs)

TactAudio/Lyngford www.acoustic-reality.com/ www.acoustic-reality.com/
Millennium & others (Equibit)

TEAC Esoteric www.acoustic-reality.com/
AZ-1 pre-main (translated (www.acoustic-reality.com/))

ThetaDigital www.acoustic-reality.com/
Virtu PowerDAC (www.acoustic-reality.com/) (Zetex class-Z)

UniwaveTek www.acoustic-reality.com/
Anaco II

Yamaha www.acoustic-reality.com/
MX-D1

You can also check Meridian and Genesis
This list was compiled a while ago and needs to be updated. I found, for instance, that International Rectifier (famous for Mosfets) came up with class D amp (thank you Magfan for the info).
PHD - do you call Switching power supply (SMPS) "Digital Power Supply"?

Proper term for these amps is "Switching" or "Class D" (there is nothing digital inside)
I hesitated between AZ Satori and some other cable until I found few reviews that complained about a little fuller lower midrange - that was exactly what I needed. AQ Indigo was, in comparison, very thin sounding. Satori is not only more refined (clarity) but has very pleasant silkiness on the top.

As for breaking in - it goes thru "stages" (as any break-in) for very long time. My small Rowland 102 stopped at about 500hrs or at least I was unable to detect anything - so be patient. It becomes a little less "forward" and more refined/musical.
No Guido. It wasn't my compilation to start with (I found it somewhere on internet) and it needs updating. It would be nice to enter updated list into Excel but I'm too lazy for that.

When I bought my Rowland 102 I knew only about Bel Canto and NuForce but this list was a shocker.
Muralman1 - It is subjective. What sounds good to you (and him) might not sound good to others (I don't doubt that your gear is great). What is important to me is the bang for the buck that you get with class D. I don't have to have (and cannot afford) the best amplifier in the world, but I always like very good deal. I can also use money to update my speakers.

I'm very surprised that people make, as you said, "hasty" decisions about technology jumping from "poor sounding" to "great sounding" with nothing in between.