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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
jays_audio_lab's avatar
jays_audio_lab OP
5,381 posts
 
Alright guys, i decided to plug in the krell 403e via unbalanced connections (krell does not recommend balanced connections when using tube preamps) and although i get a little bit of hum when i am about 2 feet from the speakers, Here are my impressions of the gs150 with 50 hours vs krell 403e:


1. Krell has far more bass control and sounds a bit faster on the bottom end. 
2. Krell has about the same soundstage as gs150
3. Gs150 may have a slight advantage on certain materials. 


That said, i had my wife do a blind test and she chose the Krell 403e. She said it felt as if things sounded "larger" lol. 
I will say that on certain songs, there may be a little more air and last ounce of detail on the gs150 that may be missing on the krell, but again this depends totally on the material. Most people COULD NOT tell these apart. This is either a high praise for the tube amp because it can keep up with the monster krell or a high praise for the krell because it can produce damn near tube sound when connected to a tube preamp. 

And now for the final news... As some of you may know, i had the luxman 900u combo and i really enjoyed it with my 803d3 speakers, but since i now own sonus faber cremonese, i am VERY CURIOUS how that set up will sound with my speakers so i just pulled the trigger on the luxman 900u combo again and it should be at my door next week.  boy oh boy... THIS WILL BE VERY INTERESTING NOW. 

ron17
607 posts
 
I have been keeping up with this thread almost since it's inception. There are not many places you can get an unbiased review of so many different types and brands of audio equipment on a weekly basis from the same reviewer! I have been looking to upgrade my amp for quite a while but have found it impossible to find a dealer who has the amps I'm interested in, much less my speakers to play them through. I had 4 amps I was interested in and thought would mate well with my system, room and musical tastes. I only found 1 dealer who would ship me (at my cost if I didn't purchase the amp) one of the amps I was interested in for an in home demo..... I finally decided to PM whitecamaross and ask for his advice. I (in detail) described my system, room, musical tastes, listening levels and what I would like to improve on over my current amp. I gave him my list of amps I was interested in (all of which he has reviewed in his system). After talking (email and phone) with him MANY times he told me because I listen at low volume levels, the amps I thought would sound good in my home would have to be turned up loud to sound their best. He suggested the Plinius SB-301 mk2 for my application. He had recently had that amp in his system, loved it and was ready to sell it. BTW he had a couple of the other amps I was interested in but didn't think they would be a good match for my needs.....I ended up purchasing the Plinius from him and couldn't be happier. It is clean, powerful, detailed and has control in the bass that I didn't think was possible with my speakers, and all at low to moderate listening levels.... Exactly what I wanted!  Thanks whitecamaross for your help and advice.
jays_audio_lab's avatar
jays_audio_lab OP
5,381 posts
 
Thanks for the feedback Ron. I'm glad you liked my input and my recommendation. Having owned tons of amplifiers, I can usually have a pretty good idea of what an amp might bring to a system. I've heard many amps in my home and understand the pros and cons of each for the most part. 
Please keep me posted of how the amp progresses. As I stated above, most amps will sound best after a few hours of use. I think the only amps that don't need a warm up are class d amps. 
kw6
691 posts
 
Whitecamaross  I hope can get a Devialet 220 or 440 pro in your home to compare  to Pass  & Krell.
thezaks
712 posts
 
@auxinput:

I'll keep this short, since this is whitecamaross' amp thread.  I had the Krell S1200U 3D, and it was my second favorite processor for both movies and 2ch, when no EQ is applied.   First would still have to be the Theta CBIV.  With RoomPerfect, the McIntosh jumps slightly ahead of the Krell (in my room).  With Xtreme D-2 dacs, the CBIV is actually a touch smoother than the Krell - kind of the opposite of what you found.   I now have the Xtreme D-3  DAC, which does make it more dynamic. 

I did not find the Krell or the Theta shouty or bright or thin or harsh solid state in my room/setup. If anything, I found the XMC1 (which I also owned for a period of time) a little bit thinner and not as smooth sounding.

The SP3 is liked by a lot of folks, and I have not seen it described as you have described it.  Perhaps there's something different with the rest of your system and/or room that is contibuting - so, getting back to the subject of this thread - what amps are you running with your setup?

Dave
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