Bryston, McIntosh, Krell or Mark Levinson

@thosb The Benchmark AHB2 is what Tom Thiel uses with his Thiel, not sure which model. I used the AHB2 in stereo and mono with the Thiel CS3.7. The AHB2 is my all-time fav amp. I still have them. However, on my CS3.7 and the 2 Ohm dips the AHB2 was not ideal to bring out the very best in the CS3.7. The AHB2 are also not going to hide any brightness if it exists anywhere in the system The CS3.7 ae not bright.

Your speakers many not play in the 2 Ohm region so they could be OK. However, there are certain speakers I would not use with the AHB2 even if the power specs matched. Such as a Paradigm Persona, TAD ME-1, or bright sounding speakers.

After now close to 60 hours of break in on the Voyager I have decided to use it on my Thiel CS3.7 and use the excellent CODA #8 on my RAAL SR1a headphones. Both would be great on your Thiel.

if you want an amp that u can upgrade speakers to, and never worry about impedance, or anything else, get the Sanders Sound Magtech amp.

  the last amp you will ever need!!

Thanks for your suggestions; keep them coming.  I must admit though, that I'm a bit surprised at some of them.  Before buying my speakers, I did a lot of readings about them, mostly here.  And I read a lot of amplifier reviews on Stereophile (which somehow fueled my bias toward the behemoth amps).  One thing that would come up about the thiels was how hard they are to drive and that their impedance would drop down to, and remain at, 2 ohms.  So, I thought that nothing but Class A or Class AB amps would do. As you can see from my original post, I've only been considering high power behemoths.  So I'm surprised that some of you are using Class D amps to power yours.  As suggested, I have been researching the LSA Voyager 350 GAN amps. More surprising is that the LSA Voyager is said to be nicer than the Bryston 7B SST.

@yyzsantabarbara, it would be much appreciated if you could elaborate on why and how you find them to be nicer, because I'm seriously considering a pair of used 7B SST2's.   
  

    

@w-j The 7B-SST is not the same as the 7B-SST2. In your earlier post I was under the impression that you wanted to get the 7B-SST not the Squared. The SST line is a bit harsh on top compared to the SST2 and SST3.

I find the Bryston gear, even the cubed, a little strong on top. For some speakers, that is not a problem. For your Thiel it could be. Even though my CS3.7 is not harsh on top I would not want the Bryston gear on it. I have owned a lot of Bryston back in the day. I owned 3B-ST, 4B-ST, PowerPac 300, 4B-SST, 7B-SST. I ended up with a very warm BAT VK-42SE preamp to tame the amp harshness. I used my 7B-SST with my Thiel SCS4 because that was the only amp I had left. It was previously powering Revel Salon1.

I just traded-in my less than a year old D-Sonic M3s 800s stereo amp (tons of power and good at 2 Ohm) for the Voyager. I can highly recommend the D-Sonic Class D Pascal module amp for Thiel’s. I was using it periodically with mine and it was very good. It has a bit of warmth on top. If you are interested in my old amp give Walter at UnderwoodhiFi.com a call. Brand new that amp is $1500. 

The Voyager is not harsh at all. It is rather exciting, detailed, and powerful and NON-FATIGING. It is better than my old 7B-SST in all those attributes. I do not have mine broken-in yet but at 60 hours on it I like it a lot and can see myself using it long term.

A used CODA #8 amp is another great amp for Thiel. Is is very pleasant, detailed, and powerful (I have one). An integrated amp that I have used on the Thiel that is the smoothest of all the amps I tried is the KRELL 300i. It also has the most bass with Thiel CS3.7. The first 90 watts of the KRELL is Class A. KRELL has a whole line of separate amps in the XD line that are like my integrated. You may want to consider them for your Thiel.

I get the K-300i back from KRELL on Monday, hopefully FedEx can manage to do that. If the less than 1 year old integrated is in perfect shape and performance I will sell it.

I have the Krell K300i with Monitor Audio Platinum PL300 ii and love the sound.