Class D ICEpower 1200as2 vs. Purifi 1ET7040SA amplifiers


Has anyone compared the ICEpower 1200as2 vs. Purifi 1ET7040SA amplifier in their hifi setup?  Legacy Audio uses the ICEpower module in their i-V2 Ultra and Doug Schroeder did a nice review on it.  I first read about the i-V2 Ultra in Doug's review on the Pure Audio Project Trio15/Coax10 review.  I just ordered these speakers, so I am interested in this amp.  I researched a myriad of class D amps and I've narrowed down my interest to the following; GaNFet (AGD Audion), Purifi (Apollon w/Sparkos opamp), MOSFET (Bel Canto REF601M) and ICEPower (Legacy Audio I-V2 Ultra). 


I know ICEpower modules are older class D technology, but if they are equal or outperform the latest offerings, that's all that matters to me.  Plus, I understand they are reliable as they have been around for a long time. 


I owned PS Audio's M700's and S300 amps which use ICEPower modules and they sounded really good, but I sold them several years ago to explore the world of tubes.  I'm back to solid state now and interested in the latest class D offerings.


Any impressions/experience with the icepower 1200as2 vs. Purifi 1ET7040SA amplifiers are welcomed.  I've already read good reviews on both of them, so a comparison between the two would be most helpful.  In addition, let me know if you have compared any of the class D amps in my list in the first paragraph.  I understand I need to hear them for myself, but I still appreciate your opinions!


Thanks in advance


I would suggest trying one of the Axiom Audio ADA series amps. The have amazing amounts of headroom and are very neutral, detailed and open sounding with none of the typical Class D harshness. They use a massive transformer and a lot of storage capacitance. I believe they have a 30 day in home trial. I am using a 4 channel one in a tri-amp set up and love it. They do not use the ICE chips, they use their own patented set up.

I seriously doubt PSAs M1200s are using the 1200 AS2s, most likely based on the 1200 AS1s


But it's not just a standard AS1s.  According to reports it was modified by PS Audio (with IcePower guidance)  to marry it to a tube input stage, for better or worse. 

To All:

You guys have provided a lot of good information with your experience and impressions on different power amps!  Unfortunately, I can’t get my hands on all the different amps you all mentioned, nor would I want to go through that many auditions.  Lol….  I’m narrowing my choices down to what I really want to try.  If I had to make a decision, TODAY, without hearing any amp, I would choose the AGD Productions Audion mono blocks or possibly the AGD Tempo stereo model.  That’s about the only class D or any class of power amp manufacturer that I haven’t read or heard any negative feedback.  Everyone describes it as a transparent amp that has a touch of bloom like tube amps, while retaining the bass, air, detail, smoothness and grip on the drivers.  That’s a big deal to me and that’s what I’m looking for.  The field upgradable output stage in a tube is a brilliant idea as well!

I originally wanted more power than the AGD Audion monos offer, but my soon to be delivered speakers sensitivity spec of 97db should do just fine with the AGDs.  I spoke with the AGD owner/designer and he is a really talented and smart guy with good customer service.  That’s a good start.


Today, I spoke to a representative from Legacy Audio concerning a few questions about their I-V2 Ultra amp.  I asked about the humming noise some advised they heard coming from the actual amp, not their speakers.  He advised they do hum sometimes whenever they are not properly grounded during the build process, but they test and fix, if needed, before shipping them out.  The reviewer of this amp advised of the humming and someone on this thread mentioned the ICEPower 1200as2 modules sometimes hum as well and that scenario was in residence, not the factory.  Shipping the unit back in forth for repair is not something I want to deal with right out the gate with a new amp, but I am considering it.  Legacy doesn’t offer an in-home trial, so that may not be the ticket for me.


I’m in no rush because my speakers require about 200 hours to break-in, so I won’t audition any amps until the speakers are performing at their best.  I don’t want any excuses for my speakers.


Thanks all for your informative feedback and feel free to add any information you feel would be useful concerning class D amps and any comparisons you experienced.  This is a fun journey, but it’s not free! 😎

Regarding power requirements, my speakers (Fyne F1.8) are 91db, my room is 25 x 25 x 8, and I don't come anywhere near exhausting the headroom of the Tempos. At 97db you will have gobs of power with either the Audions or the Tempo. 

I would suggest that unless you want to bi-amp I would get a pair of Audions instead of a single Tempo. Imaging will be better. 

97db? What did you get, Spatial X5? I had a pair at one time.