My Long List of Amplifiers and My Personal Review of Each!


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
NAD M25
PARASOUND HALO
PARASOUND CLASSIC
KRELL TAS
KRELL KAV 500
KRELL CHORUS
ROTEL RMB 1095
CLASSE CT 5300
CLASSE CA 2200
CLASSE CA 5200
MCINTOSH MC 205
CARY AUDIO CINEMA 7
OUTLAW AUDIO 755
LEXICON RX7
PASS LABS XA 30.8
BUTLER AUDIO 5150
ATI SIGNATURE SERIES 6005

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)

Update: The reviews above were done in January 2015. Below is my newest update as of October 2016:



PS AUDIO BHK 300 MONOBLOCKS: Amazing amps. Tons of detail and really amazing midrange. the bass is amazing too, but the one thing i will say is that those of you with speakers efficiency of 87db and below you will not have all the "loudness" that you may want from time to time. These amps go into protection mode when using a speaker such as the Salon, but only at very loud levels. Maybe 97db and above. If you don’t listen to extreme crazy levels, these amps will please you in every way.

Plinius Odeon 7 channel amp: This is THE BEST multichannel amp i have ever owned. Far , but FAR SUPERIOR to any other multichannel amp i have owned. In my opinion it destroyed all of the multichannel amps i mentioned above and below. The Odeon is an amp that is in a different tier group and it is in a league of its own. Amazing bass, treble and it made my center channel sound more articulate than ever before. The voices where never scrambled with the action scenes. It just separated everything very nicely.

Theta Dreadnaught D: Good detailed amp. Looks very elegant, has a pleasant sound, but i found it a tad too bright for my taste. I thought it was also somewhat "thin" sounding lacking body to the music. could be that it is because it is class d?

Krell Duo 300: Good amp. Nice and detailed with enough power to handle most speakers out there. I found that it does have a very nice "3d" sound through my electrostatics. Nothing to fault here on this amp.
Mark Levinson 532H: Great 2 channel amp. Lots of detail, amazing midrange which is what Mark Levinson is known for. It sounds very holographic and will please those of you looking for more detail and a better midrange. As far as bass, it is there, but it is not going to give you the slam of a pass labs 350.5 or JC1s for example. It is great for those that appreciate classical music, instrumental, etc, but not those of you who love tons of deep bass.

 It is articulate sounding too
Krell 7200: Plenty of detail and enough power for most people. i found that my rear speakers contained more information after installed this amp. One thing that i hated is that you must use xlr cables with this amp or else you lose most of its sound performance when using RCA’s.

Krell 402e: Great amp. Very powerful and will handle any speaker you wish. Power is incredible and with great detail. That said, i didn’t get all the bass that most reviewers mentioned. I thought it was "ok" in regards to bass. It was there, but it didn’t slam me to my listening chair.

Bryston 4B3: Good amp with a complete sound. I think this amp is more laid back than the SST2 version. I think those of you who found the SST2 version of this amp a little too forward with your speakers will definitely benefit from this amp’s warmth. Bryston has gone towards the "warm" side in my opinion with their new SST3 series. As always, they are built like tanks. I wouldn’t call this amp tube-like, but rather closer to what the classe audio delta 2 series sound like which is on the warm side of things.

Parasound JC1s: Good powerful amps. Amazing low end punch (far superior bass than the 402e). This amp is the amp that i consider complete from top to bottom in regards to sound. Nothing is lacking other than perhaps a nicer chassis. Parasound needs to rework their external appearance when they introduce new amps. This amp would sell much more if it had a revised external appearance because the sound is a great bang for the money. It made my 800 Nautilus scream and slam. Again, amazing low end punch.

Simaudio W7: Good detailed amp. This amp reminds me a lot of the Mark Levinson 532h. Great detail and very articulate. I think this amp will go well with bookshelves that are ported in order to compensate for what it lacks when it comes to the bass. That doesn’t mean it has no bass, but when it is no Parasound JC1 either.
Pass labs 350.5: Wow, where do i begin? maybe my first time around with the xa30.8 wasn’t as special as it was with this monster 350.5. It is just SPECTACULAR sounding with my electrostatics. The bass was THE BEST BASS i have ever heard from ANY amp period. The only amp that comes close would be the jC1s. It made me check my settings to make sure the bass was not boosted and kept making my jaw drop each time i heard it. It totally destroyed the krell 402e in every regard. The krell sounded too "flat" when compared to this amp. This amp had amazing mirange with great detail up top. In my opinion, this amp is the best bang for the money. i loved this amp so much that i ended up buying the amp that follows below.

Pass labs 250.8: What can i say here. This is THE BEST STEREO AMP i have ever heard. This amp destroys all the amps i have listed above today to include the pass labs 350.5. It is a refined 350.5 amp. It has more 3d sound which is something the 350.5 lacked. It has a level of detail that i really have never experienced before and the bass was amazing as well. I really thought it was the most complete power amplifier i have ever heard HANDS DOWN. To me, this is a benchmark of an amplifier. This is the amp that others should be judged by. NOTHING is lacking and right now it is the #1 amplifier that i have ever owned.

My current amps are Mcintosh MC601s: i decided to give these 601s a try and they don’t disappoint. They have great detail, HUGE soundstage, MASSIVE power and great midrange/highs. The bass is great, but it is no pass labs 250.8 or 350.5. As far as looks, these are the best looking amps i have ever owned. No contest there. i gotta be honest with you all, i never bought mcintosh monos before because i wasn’t really "wowed" by the mc452, but it could have been also because at that time i was using a processor as a preamp which i no longer do. Today, i own the Mcintosh C1100 2 chassis tube preamp which sounds unbelievable. All the amps i just described above have been amps that i auditioned with the C1100 as a preamp. The MC601s sound great without a doubt, but i will say that if you are looking for THE BEST sound for the money, these would not be it. However, Mcintosh remains UNMATCHED when it comes to looks and also resale value. Every other amp above depreciates much faster than Mcintosh.

That said, my future purchase (when i can find a steal of a deal) will be the Pass labs 350.8. I am tempted to make a preliminary statement which is that i feel this amp could be THE BEST stereo amp under 30k dollars. Again, i will be able to say more and confirm once i own it. I hope this update can help you all in your buying decisions!


128x128jays_audio_lab
WC,

Again, I wanted to say what a joy it was visiting the show with you on Friday and it was a a pleasure meeting your lovely wife.  You asked me to check out the GT Audio Works and I have been struggling to put it into words how I felt about them.  Firstly, I was not able to seriously listen to the Martin Logan room as it was so packed that I could not get in.  This says something on it's own merit...

IMHO, the GT Audio was in fact the best sounding room as far as panel speakers went that I was able to seriously audition.  I did not have them shut off the subwoofers so can't comment on that distinction but what I heard was very, very good.  Anyone considering this type of speaker would be seriously remiss in not auditioning.  

This being said, I have the same general feeling about the GT speakers that I have experienced with all speakers in this category that I have been fortunate enough to hear.  They sound very good but I don't love listening to them.  They have ever failed to move me.  I say this at risk of igniting a fire storm because of the many strong opinions on this thread but I would like to relay and elaborate on some of what we discussed on Friday...

Focusing only on or even emphasizing, "clarity" or "sparkle" or in fact on any other single facet of the pallet of the sonic spectrum is limited and limiting.  Warmth and tonality, perhaps a result of lower, inner harmonic details are far more important to me than a very detailed presentation.  Sense of weight and body including the extension, authority and control of bass are something that we share a common love of but for our mutual friend out west, this is not as important.  I could continue to name other areas:  sense of pace, rhythm, soundstage, height, depth, dynamic range, etc. all need to work together in presenting an aural picture of the recording that conveys all aspects of the sonic spectrum.  How each of us perceives and relatively values this pallet is a personal choice and is not one that I feel should be imposed upon any one else.  There is not a right and wrong answer to what a person likes.  There is not one answer to what is great or best.  People voicing their opinions of equipment would do well to always remember this.  Which flavors more appeal to one person in no way invalidates the flavors someone else likes and this respect should be overt.  

We visited several dozens of rooms together.  I have to say that I couldn't agree more with WESC's assessments.  Though I know you (WC) didn't' like the choice of music in the Von Schweikert room you appreciated the system but would never choose that system.  I found it to be absolutely stunning.  You and I were both blown away by the Focal Grande's but neither of us would spend that kind of money on that system--though I can say to the one person who voiced his opinion and "bet" on the result about how the Focal's compared to other speakers resoundingly looses his bet.  These were one of the fastest, most detailed speakers I have ever heard of any type of design and this speed and detail was still full of the rich harmonic textures.  But these speakers imposed themselves on a room in a way that they look like they belong in a club or a studio (I feel the same way about the big Wilsons).  The Von Schweikerts could absolutely fit into the decor of a living room.  I had fun listening to the Magico's with the subwoofers but they were not anything I would spend hard earned money on...  You and I both loved the Sonus Faber Aida.  As I have previously commented on your thread, I have heard that speaker on both SimAudio and Audio Research reference equipment (rather than the parent company--"politic'ed"--McIntosh) and this speaker is even better than we were able to hear it at the show.  It just goes to illustrate... all of these systems were great, some just ticked our personal boxes more than others.

There were a couple of takeaways from the show that I thought should be mentioned.  A number of the rooms that we went to (big Wilsons, YG in GTT Audio, SimAudio/Sonus Faber) on Friday afternoon that I revisited on Saturday and the sound was markedly improved.  I found out that GTT was using "out of the package" Kubala Sosna cables... it showed!  All of these rooms were an order of magnitude, improved after a full day of cooking!  I didn't make it back to the Block Audio room, but I fear that it would not have dramatically improved.  I expect that they will have learned much from this experience.  The Friday-Saturday changes really illustrates how important it is that exhibitors fully break in their equipment before bringing it to the exhibition.  In fact, I guess that everything should be set up by Wednesday and played for at least 36 hours before the doors open.  I don't know if this is practical, but it sure seems necessary.

Secondly, I took a friend who was a complete hi-fi novice to the show on Saturday.  Prior, he had only heard one "high end" system in his life, one time--mine (assuming that I might even carry the label of a "high end" as my system is significantly less than $100K).  He was excited and blown away at the quality of sound at most of the rooms.  At the end of the day, he was unequivocal:  his 2 favorite rooms were:  Nordost (using around a $10K KEF, Hegel, mac book air combination (and around $30,000 of Nordost products which is just insane!) and the room with $30,000 Sonus Fabers (I can't remember the model, perhaps Amadi) partnered with SimAudio at an estimated system cost of well under $150,000.  I raise this point to say that you can achieve a very good system that can convey performance, emotion and a great experience without needing to remortgage your house (and sometimes a few of your friends' houses!).  We had heard numerous $200+K systems and they didn't move him as much as something far less expensive.  I suspect that if Nordost had used "only" $10,000 in cables and treatments, that "humble" $20,000 system would have still sounded great.  Well designed equipment partnered with other complimentary equipment intelligently set up with the right accessories makes for a great system, not just dumping money on top of money.

Around a month ago, I strongly encouraged you to come to this show.  I hope that you found it to be a valuable and positive experience.  I certainly enjoyed getting to meet you and your wife and many other people.  At the end of the day, we are a small community of hobbyists with a shared interest in hearing great music in our homes.  To be able to spend 3 days with people sharing this common goal was just great!  Thanks for coming to Chicago to participate!

closenplay,
Well said about how big speakers in big rooms, listening at far distances don't give musical intimacy/engagement.  This is also true outside of shows, in homes.  The best hybrid ML may be the 13a which is large enough to have good sound output, but listening at 8-10 feet away still yields intimacy/clarity.  The CLX is a special case, because it is a pure electrostatic, and the midrange/HF panel is actually very narrow, which enables the best clarity of the ML line.  
WC,
No doubt your home 3F system sounds so much better than at the show.  Audiotroy admitted the same.  As you listen at home again, you will probably find that the 3F still has great clarity.  A good discovery at the show was how the ML 13a was so excellent.  Although it doesn't have the huge spaciousness of the Neo, its better accuracy plus good spaciousness (which is more true to life than the Neo) showed you how important clarity is.  Although the Constellation electronics helped, they are probably no better than your Block amps, although the ARC ref 10 is probably veiled and euphonic compared to the Con preamp.  So you had an excellent demo of the ML 13a itself, which serves as a great reference for you.  The Rowland 535/Block comparison should be very informative.

Speaking about vocals, I heard male and female singers up close in a rehearsal yesterday.  The sound comes out of the mouth which is only a few inches, so live singers are like a point source with narrow imaging and great focus/clarity.   If a hifi system makes them sound big, that is totally unnatural and not true high fidelity.  So listen to your 3F again and appreciate what they do well.  I always like to confirm my ideas with more experiences like this, to keep me honest.  
psynder149,
You raise good points.  Warmth is found to some extent in live music.  In live music, there is no distinction between clarity and warmth, because clarity enables the revealing of subtle harmonic information which is natural warmth.  The problem with warmth in hifi systems is that subtracting details does create a certain kind of warmth, but this leaves the hifi listener with a feeling that subtle musical detail is missing.
@psnyder149

Focusing only on or even emphasizing, "clarity" or "sparkle" or in fact on any other single facet of the pallet of the sonic spectrum is limited and limiting. Warmth and tonality, perhaps a result of lower, inner harmonic details are far more important to me than a very detailed presentation. Sense of weight and body including the extension, authority and control of bass are something that we share a common love of but for our mutual friend out west, this is not as important. I could continue to name other areas: sense of pace, rhythm, soundstage, height, depth, dynamic range, etc. all need to work together in presenting an aural picture of the recording that conveys all aspects of the sonic spectrum.

I agree with you on this one . For far too many people, it is all about detail, which is fine,BUT, how long can you listen without ear fatigue. Highly detailed systems usually can’t be turned up very loud nor can you stand to listen very long. It is impressive, but only at first , until you listen for a bit , then it becomes annoying to the ears.
You could not have stated it better, IMO