So I have been in a long journey looking to find the best amplifiers for my martin logan montis. As you know, the match between an amplifier and speakers has to be a good "marriage" and needs to be blend exquisitely. Right now, I think I might have found the best sounding amplifier for martin logan. I have gone through approximately 34-36 amplifiers in the past 12 months. Some of these are:

Bryston ST, SST, SST2 series

With all that said, the amplifiers I mentioned above are the ones that in my opinion are worth mentioning. To make a long story short, there is NO 5 CHANNEL POWER AMP that sounds as good as a 3ch and 2ch amplifier combination. i have done both experiments and the truth is that YOU DO lose details and more channel separation,etc when you select a 5 channel power amplifier of any manufacturer.
My recollection of what each amp sounded like is as follows:

ATI SIGNATURE SERIES 6005 (great power and amazing soundstage. Very low noise floor, BUT this amplifiers NEEDS TO BE cranked up in order to fully enjoy it. If you like listening at low volume levels or somewhat moderate, you are wasting your time here. This amp won't sound any different than many other brands out there at this volume. The bass is great, good highs although they are a bit bright for my taste)

NAD M25 (very smooth, powerful, but somewhat thin sounding as far as bass goes)
Bryston sst2(detailed, good soundstage, good power, but can be a little forward with certain speakers which could make them ear fatiguing at loud volumes)

Krell (fast sounding, nice bass attack, nice highs, but some detail does get lost with certain speakers)

rotel (good amp for the money, but too bright in my opinion)

cary audio (good sound overall, very musical, but it didn't have enough oomph)

parasound halo (good detail, great bass, but it still holds back some background detail that i can hear in others)

lexicon (very laid back and smooth. huge power, but if you like more detail or crisper highs, this amp will disappoint you)

McIntosh mc205 (probably the worst multichannel amp given its price point. it was too thin sounding, had detail but lacked bass.

butler audio (good amplifier. very warm and smooth sweet sounding. i think for the money, this is a better amp than the parasound a51)

pass labs (very VERY musical with excellent bass control. You can listen to this for hours and hours without getting ear fatigue. however, it DOES NOT do well in home theater applications if all you have is a 2 channel set up for movies. The midrange gets somewhat "muddy" or very weak sounding that you find yourself trying to turn it up.

classe audio (best amplifier for multi channel applications. i simply COULDNT FIND a better multi channel amplifier PERIOD. IT has amazing smoothness, amazing power and good bass control although i would say krell has much better bass control)

This brings me to the mark levinsons h series (532h and 533h to be specific). I have done EXTENSIVE listening with them for the past 2 weeks and i will say that NO OTHER amplifier gave me a better blend of everything as these amps did. They have EVERYTHING from top to bottom. Granted, i still think krell has better bass, BUT the highs and midrange smoothness are UNMATCHED. I really thought that i was going to simply try them and move on to the next amplifiers and i just couldn't. My mind was set that i was going to keep the classe audio, but the levinsons just did everything better. I can't really say anything bad about it other than perhaps some of you might need MORE POWER in a larger room. They are THE ONLY amplifier that i can listen to at low volumes and HEAR everything and each detail. It doesn't lose a thing even at low volume. I have never experienced this before. Very 3 dimensional. Is it worth the retail price? no it is not, BUT if you find it at good deal, make no mistake this H SERIES will beat whatever you have in your set up right now UNLESS you are talking crazy ultra high end units out there. If you can pick up one of these puppies in good shape for under 5,000, i don't think you can do better. It will BEAT any 2 channel amp that you can think of for under 10,000 in my opinion. The only other amp i can't speak of is the plinius sa 103, but if i do find it at a good price, i might have a review for it.
Some of you might be in the quest for a good 2 channel or maybe a 5 channel amplifier in which i recommend what i have which is the 533h and 532h. i am willing to put up money on the table that this 2 amplifiers would be ANY 5 channel amplifiers out there REGARDLESS of the price period. Everything comes to life with these. I can say that if you have money to spend and are ACTUALLY wanting to HEAR an improvement in sound over what you have, DO NOT overlook the h series amplifiers from levinson. It will blow your mind.
yes, ATI builds for levinson because they had to go to a reliable manufacturer and not keep making the same mistakes of building unreliable units since that was clearly hurting them. I can tell you that these amps sound VERY DIFFERENT. I do find it funny how the vast majority think that because ati makes it, then both amps must sound the same. However, what people DON'T realize is that they are voiced VERY VERY differently. The ati is more forward as I stated above so maybe it would benefit from a laid back preamplifier. I would take the classe 5200 or 5300 ANY DAY over the ati. Why? I am not a fan of bright or forward sounding amps. The most I can handle are the high frequencies from Krell. That is as far as I want to go. The BEST multichannel amp I have heard is the classe HANDS DOWN. However, a 3ch levinson along with a 2 channel would beat a classe 5200 or 5300. I have done this comparison.
kaifupdaddy, did you ever get a chance to do the demo of all the amps you wanted to do? Cant wait to read your review!!! So far I have owned ATI At6003 amp and find whitecamaross review of that amp spot on, thank you whitecamaross!!! Sold ATI now thinking whether pass labs 250.8 or  mark levinson 532h....any input whitecamaross?
i sold my 532h last month and owned the 350.5 soon after that. I loved the 350.5 so much that I went for a 250.8 which is what I currently own as of 3 weeks ago.
Spectacular sounding amplifier. Far superior to any amp I’ve owned. I can give you more of my opinion if you want. Message me directly.


I would be interested in your comparison between the 532H and Pass Labs
250.8 -