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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
ricevs
1,543 posts
 
Everything makes a difference...

Line sources have advantages.....so do point sources.  What is really crucial is how something is done.  Wilson has 4 veiled binding posts and one veiled spade in series with the mids and highs.  You will never get all the information possible doing this.  No matter how good your tweeter is you cannot get back natural information that is lost with binding posts, etc.

I had a neat experience Friday when I went to my friends house to redo a crossover for his completely custom made Apogee Duetta speakers.  After the fix we listened to about 5 different songs through the original fully custom and tweaked crossover.  Then we put in the new crossover that I built for him.....OMG....what a difference.....like it was a new speaker.  Less bright, less glare, way warmer and yet way, way more information.  He played a jazz piece with the old crossover and when it started I said to him.....Is this a mono recording?....then information came in from each side showing me that it was indeed a stereo recording......but the original three instruments that started the cut were so close together I thought it was mono.  With the new crossover the size of all three instruments was larger and they were now separate with air around each one.....incredible difference this new crossover made.  His custom Apogee speakers gave me the best sound I have ever heard using a streaming source (no master tapes).  Would not take any Wilson under $200K for what i heard then.....and he has tweaks yet to make to the network in the speaker and to the footers underneath the xovers.  He is going to France tomorrow for 5 weeks and he will be running the speakers continuously while he is gone.  I have a couple of pics of his new xover on my site.  I will add some more pics, info and pics of his entire system down the road.  The input connectors are plastic bolts, washers and wing nuts....the worlds best connecting system....cheap too.

http://tweakaudio.com/EVS-2/Speaker_ideas.html

Crossover pics at bottom of page.

One of the reasons his system is so incredible is his AC system.  He is using a 3000 watt inverter.....so completely off the grid and then followed by the incredible Puritan Audio line filter and the Puritan Audio grounding system including a separate grounding rod that he had installed outside his room.  Talking about low noise!!!!!  No loss of dynamics or anything using this system.....just fantastic.


psnyder149's avatar
psnyder149
160 posts
 
At this time I have 2 dedicated 20 amp circuits wired with larger than required (10) gauge wire each with an isolated ground that goes to a separate grounding stake independent from the rest of my house.  The wire is standard grade (Home Depot) as I didn’t have the funds to try some of the audiophile in wall wiring brands. The outlets are Audience Hidden Treasure with Furutech GT’s wall plates and carbon fiber outlet covers. Nordost Valhalla pc s connect Nordost QBase 8 (original) with 2 QV2 and 1 QK1 ac enhancers. Pre/pro and amp are each powered with Valhalla and my external Keces power supply for the Innuos server is Frey2.  To date, I have not been able to acquire a QKore ground unit but that will be a future purchase.  All components are on various sort kones.  
I recently moved and did all of the inwall changes at one time so I can’t vouch for independent incremental differences, however a few weeks ago I replaced a Nordost Brama for the third Valhalla and the result was just stunning.  At my prior home I had dual 20 amp lines with isolated grounds but sharing the same central grounding rod and hospital grade outlets. The PS Audio, definitely was not up to powering the system with the amp but even just conditioning the low power devices left the sound constrained compared to the QBase w ac enhancers and lower end Nordost pc’s.

With system currently, the images are more defined. Bass is significantly extended but yet better controlled.  Noise floor is noticeably lowered and instruments have a more natural, harmonically complex tonal quality.  Unfortunately, during the move I was without my full system for 6 months and my new room setup is inferior to before.  But with substituting only a Nucleus + for the Innuos Zen mini and the in wall improvements the sound was vastly improved.  The substitution of the final Valhalla is what took everything over the edge.  It was as if I doubled the cost of all of the components in my system. Before it was very good, now it is significantly better.  
I kept the power plant for nearly a year before selling it.  About 9 months in, I put it back in the wall and incorporated a variety of the Nordost products as well. In all cases the sound was comparatively constrained.  Everything a bit flaccid and far less exciting.  Once I removed it, the impact was immediate and obvious.  Note that PS Audio versus everything plugged straight into wall yielded some improvements in clarity but lost dynamics so the it was a trade off with overall small improvement. The current setup is significantly better and I do not hear any downsides.  This journey has spanned around 3-4 years minus the 6 months. 


jays_audio_lab's avatar
jays_audio_lab OP
5,381 posts
 
"Would not take any Wilson under $200K for what i heard then"

I guess it's a good thing my XLF are not under $200k so i suppose mine passed your superior standards huh?
Post removed 
thezaks
712 posts
 
WC,
I think you're saying that some power cords can clean up the power enough that you can opt to do without a power conditioner.  The other thing that many power conditioners provide is surge protection.   Of course, many of us have power amps directly to the wall anyway :-)
I have somewhat of a whole-house surge protector at the panel - I'm sure others do as well.
Dave
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