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
Gryphon Pandora has been added and the boulder 2110 preamp removed. Here are the results:

https://youtu.be/mIx2SHmIXds

(Please watch the video until the end to find out what specific changes took place)
The interior build of the Boulder amps are just in a whole other class compared to the Mephisto. A much more refined product, that obviously went a lot further in research and development.
The Gryphon’s gut looks like a chinese overbuilt layout compared to the Boulders...

Gryphon is a Dodge Challenger Hellcat. Boulder is a Ferrari or Porsche...

But but but, Mephisto got huuuuge bass dynamics and shakes the whole room...😂
@techno__dude 

Ever drive a Hellcat?

It's an awful lot of fun.

As is a Porsche or Ferrari.

I've had the chance to drive all 3.  All good, one is a flat out blast, one is very good but you need to know what you are doing and have it on the right course, one makes you a better driver.

But if I REALLY just wanted an adrenaline shot, and to put a grin on my face without thinking much about it.  

Give me the Hellcat.  Sometimes audio is the same way.  I just want to smile and not think too much about it.

Bass is fun.  (and I'm not talking about 3 15 inch woofers crammed in the back of a small car with a huge amp playing one note.)

Now as for what I would want to own...
You can’t tell someone how much fun a hellcat is to drive if their only point of reference is a honda civic.
I can’t convince someone that gryphon or boulder are awesome amps if  their point of reference is Bryston, nad etc. The journey is what gets you to appreciate the higher end offerings. You have to "graduate" your ears slowly as you go up the ladder.
If i brought a person here who has only had rotel for amplifier and showed them my Gryphon or boulder they would only be amazed at the huge size of the product but they don't really quite grasp the level of gear that it is. It's like me, if i was told to drink a glass of wine that costs 40k for a bottle, my mind wouldn't quite understand what to look for when it comes to the flavor and taste of the wine because my point of reference are $20 dollar bottles...

@whitecamaross 
you got to come up with some unique way of comparing mephisto stereo vs boulder mono

- boulder is twice as powerful but each amp only needs  to work half as mephisto
- even if you choose a lower to moderate volume, the channel separation and isolation itself is going to reap a lot of dividends
There is no unique way to compare. Cant do a thing about the power discrepancy. It is what it is. We are strictly trying to hear the tonality and overall sonic characteristics. We are not racing both amps. It won't be a decibel contest. Mephisto is cruising at the volume levels i plan to compare both amps. In case you forgot, the Mephisto is dual mono design. It has 2 Powercords and each channel is a mirror image of the other.  
Again, there is not much to do other than to make sure they are on stands (hopefully) and at exactly the same volume and both using the same cables. I can only control what i can and their corresponding wattages isn't something I have control over. 
Dodge vs Ferrari.

Gryphon vs Boulder.

Boulder and Ferrari for the serious buyer who knows it’s stuff...
both amplifiers looked quite extraordinary albeit i'd say the Gryphon the far more traditional given the large capacitors crammed into that far from small space.  the finish on the exterior of the Boulder makes them objet d'art in my opinion.  absolutely beautiful.  and given they aren't hot they really do become beautiful functional art for your room.  

looking at the finish and the interior layout the Boulder really does look like it comes from another world.

i think it a shame Jay if the comparison becomes which one deals with not having isolation better.  i implore you to leave the gryphon on the stand and save your back.  who gives a rats arse if some unappeasable people bang on about it.

i think changing power cords is also a sub-optimal thing to do because things do settle in a system and by stirring it up once again your loyal listening audience is listening to a less beautiful sound.  for some a/b comparison i just don't think it is worth it WC.  

what if the idea was "optimisation".  you just make each one play as good as you can make it play.  i am sure we will still get a sense of where the comparison is at.

thanks for doing this.  it is pretty amazing.  i hope your brain doesn't freak out when it realises there is no higher place to go and no more endorphins to come from new amp deliveries :-)
I think you are trying to explain something that just cannot be completely understood unless you are there.
The absolute best example  IMO of this IS :
If you have ever been to a Top Fuel Drag Race ?
You can try all day to describe and explain it to someone , but  being there is UNREAL.. AMAZING ,actually ....especially the first time .!!
For those who have been, You completely understand this .
 
@grey9hound 
I couldn't have said it better myself. 
By the way, the next surprise i will be unveiling will be something you will hopefully like. Stay tuned ...
Years ago, I volunteered my time (wrenching) and cash to help a fledging top fuel funny car driver make his dream come true.
Unless you’ve experienced a top fuel (nitro-methane burning) funny car / dragster at a national race (not an exhibition) you have NO IDEA what this is about.
The ground shakes when these cars leave the line / start their quarter mile race. No ear plugs means you’d damage your hearing over the weekend. The exhaust can be lethal from as far as 50 feet from the car! (Meaning it could blow you off your feet with force to kill you)
When I was involved, these engines made 6,000 + HP ! ! ! !
Actually - I prayed (literally) for the driver to be safe every time the car ran down the quarter mile.
It’s a controlled explosion and many times it’s not controlled. With so much power in such a short period of time, bad things happen quickly when not in total control.
Without graduated experience, I "regular" driver could not drive / steer a top fuel quarter mile car. The driver experiences positive 3 G’s when leaving the start line and negative 4 G’s at the end of the quarter mile when the brakes and parachute are used. Some drivers had to retire due to a detached retina from the negative 4 G’s.
The driver I helped had blurred vision for a week because of tire shake - he couldn’t get out of it (stop it) soon enough.
In a Funny Car, the driver sits and is strapped in immediately behind the engine with their feet on each side of the clutch (called a scatter shield because this housing is so thick to stop the clutch from exploding and killing the driver), literally on top of the rear end and in between the 2 wide rear tires. Anything bad happens and and there’s no where to go to avoid it.
Fire suits and full fire suppression systems are used and are critical for safety.
I teach motorcycle paved track riding - some people think what I do it crazy (full leather suit & knee on the pavement). I would NEVER want to drive a nitro methane car - NEVER, EVER, NEVER, NEVER!
Final Video:
Gryphon with Synergistic Research:
Who do you prefer? Synergistic Research or Audioquest?? 
Let me hear your thoughts!

https://youtu.be/x1FiMCAMLpc
First off, thanks for doing this. Really fun to geek out and listen and compare. Normal people would surely think anyone who does this is f’ing nuts but screw ’em.

Ok, I listened carefully to all four presentations successively with headphones in reverse order.

You basically have four combinations of two variables. Gryphon Pandora vs Boulder Preamp. And Synergistic Research vs. Audioquest Speaker cables. And the four combinations across those two variables.

First impression: The biggest difference was in the Boulder preamp >> the Pandora preamp. Dynamics so much better. Almost sounded like volume higher on videos 1 and 2 (Boulder) versus 3 and 4 (Pandora).

Second impression: To a lesser degree than the preamp difference, I preferred the Audioquest cables to the Synergistic Research cables. More airy presentation, better clarity, better decay. That said, it could be that the SR does bass a little better than the AQ. Bass actually seemed tightest on video 4 (but that could be Alexx breakin, see comment below).

So ranking the video presentations in order for me:
1st place: Video 2 (Boulder/AQ).
2nd place: Video 1 (Boulder/SR).
3rd place: Video 3 (Pandora/AQ).
4th place: Video 4 (Pandora/SR).

Fun stuff.

I actually think I could hear the Alexx come in better across the four videos also. By #4 Alexx seemed to be settling in better, especially on bass.

Now I might be completely wrong on all of this, but that’s what I heard.
thanks for this Kren. I tried to keep things as consistent as possible and purposely did 4 videos for you all to try to go back and forth and listen critically.
I am glad that you COULD TELL a difference in cable changes with each preamp because that means my microphone is at least capturing things.

Anyone else would like to chime in and give their input?





Ps: Boulder monos are now sitting on Critical Mass MAXXUM stands.

https://youtu.be/AP4dV5is0vY




Yeah chime in before WC gives his impressions. Tell me I’m crazy if you disagree with what I heard. I won’t be offended. 
I thought the differences in preamps was much larger than the cable differences, but I suppose that is exactly what one would expect, as components should have bigger differences than cables usually 
Amazing sound wc congratulations the only thing I could add would be to clean up your cables, too many cables pc,ic an sc running parallel to each other. 
Cables should be at least 3 in and preferably 6 in apart and get them off the carpet. I’m sure you have heard of static electricity with carpet.

You famously state everything matters at this level’ well practice what you preach because properly separating your cables and getting them off that carpet will definitely give you improvement in sq. Even at your level.
I think right now i am focusing on the bigger things such as isolation devices, cabling, etc. Moving cables out the way, passing the vaccum, turning the lights off when listening, etc are the tiny things.
Lastly, there is a reason WHY my channel is called Jay’s audio LAB...
Labs tend to have $h!t everywhere.
I want to keep doing more shootouts and sometimes I just get too lazy to be picking up every single cable off the floor that i am not using for an hour or two. 
I thought that was a joke - because you change equipment so much.

No offense intended, just stating what I thought the author meant.
Not much more speakers you can try that will compete with the Alexx and the Utopias in your room lately.

What you could do, instead if that pleases you, is try smaller and more affordable models, for fun, to see what are the tradoffs and to give your audience opinions on alternatives...insight on what the more affordable stuff gives and gives not compared to the ultra high end. You already did so with Sopra 3, ML ESL 11A, and others...

Examples that come in mind. Spendor D9.2 , Dynaudio Confidence , PMC Fact 12.
@tjassoc

You are correct - i assumed the same as well. That said, what is very interesting to me is how we are as human beings. If we have to pay for something we complain and if we get something for free then we complain too?
i remember a long LOOOONG time ago (true story) when i had to go to downtown miami to hand out sandwiches for the homeless. It was soooo hot (like 100F with insane humidity) so we were walking up and down the streets and i was shocked at what some of the homeless people said to me:
" hey, if it does not have any cheese, i dont want it" 
I am just shocked at how we can be as humans. If someone is handing you free food, you are broke, living on the streets, you are going to complain and turn down food??????? lol...

Some people complain about the commercials on local tv stations so then why dont they pay for Netflix ??
ohhhhh because it costs money so that is an issue too... i just don’t get it.
I have to admit, I didn't think I'd be interested in lesser speakers - but the Tekton is a speaker I was curious about.
I wouldn't buy them to try them but I would like to hear them to learn / understand how they sound. Whitecamaross is the next best thing :-)
Jay,
I agree on the topic of your last post.

Kren0006 is right on nearly all his guesses. I say Tekton also.
i'd love to see WC with some Audio Note an-e speakers and king ka-101 pro el84 int amp.  plus a turntable of course.  see what he thinks about a modern take on SET/horn type thing (not suggesting horns but high efficiency speakers - i know how much Jay hates horns).
I hope I'm wrong on the Tekton guess, as I don't have any interest in that brand (I find them hideous looking, even though I'm sure they sound nice).

Nice work WC getting two stands in for the Boulders.  I like how you showed the imperfections of the one stand.

So now are all three stands Critical Mass?  I can't remember what the Gryphon is on.  You also had one other fancy stand that wouldn't support the Gryphon - is that one still around as well?


All stands are critical mass. Boulder told me to get them off the stands and put them out by the pool deck... They don’t need all the damn "babying" that most audiophiles like to do with components.
Grab a sledge hammer and hit them hard while you listen to music. It won’t matter" LMAO
Well, i sold my Magnepan 20.7s so that allowed me to buy Critical Mass Centerstage footers to put under the Boulder EVEN THOUGH i was told me to stop the nonsense lol. 
It will be one epic battle, but i am glad i am off next week so i will be able to play with all this. 
The only thing i need to really REALLY think about is if i should leave the Mephisto with the Audioquest Powercords for the shootout or not. Someone said to me that i should leave the mephisto with audioquest powercords because that is how i have always played them for you all so it would not be fair to strip it from the powercords for the comparison... hmm.. i need to think on this one. 
I say leave the Audioquest power cords.

Look at it this way: Nobody uses the stock Mephisto power cords, probably almost everyone uses the Boulder stock power cords, so using the AQ would be a more realistic real-world setup, plus it narrows the cost gap between the two setups. That in itself is just as powerful a fairness argument than having to use stock power cords across the board, for "stock-ness" sake.

To do the shootout with stock Gryphon cables probably doesn’t have much relation to real life.
Maybe on some level there’s a fairness thing but if nobody ever uses that setup what good is it? Plus the familiarity issue for yourself and the previous videos (continuity). It’s a different situation with Gryphon than Boulder with stock power cords given the funky connectors there.

I get it there are arguments for using stock power cords and do whatever you think makes most sense but that’s what I’d say.
Makes sense but since you all have never heard the boulder, maybe i should have left them on the floor...and since we are trying to close the price gap between both...
WC,
I'm with kren0006 regarding the real world setups - upgraded power cords will typically be used on the Mephisto, and the stock will typically be used on the Boulder. 


Did you get the CenterStage or the CenterStage2 footers?   Would be interesting to compare with the Stillpoints, if you still have those. 


Dave
kren0006,
If you like the Tekton sound, you would come to like the looks.  It's like an OK looking lady who is funny and nice, and then seems more attractive.
I have an idea. Viber records his system, and tecno records his. Then send them to Jay and have him post them on his channel. Maybe we can do some videos of the groups systems and do some comparing of what we think? Just get with Jay about music selection in case something isn’t allowed to be played on YouTube.
Sorry Viber I just can’t relate to that logic; never had to settle ; )

Nah, if it’s Tekton it’ll be fine - I won’t complain about it. It’s all fun to hear if that’s what it is, even if there are better options for the price (can’t say, I’ve never heard Tekton - just speculating)
Guys,
Let's just be happy as hell we will hear cool stuff during our Christmas break. Let's be nice to each other at least through the holidays. We always have 2021 to tear each other apart. 
Don't worry, the surprise has actually arrived and i hope I can display it this weekend. 
We have the boulder to listen to as well as another component. I also want to try the synergistic research powercell SX to see if it is better than my audioquest Niagra 5000? 
I will spend 3 days straight packing, shooting videos and slowly releasing them to you all. 
Let's be cool and get along? I am working my ass off here to get you something to be looking forward to🙂
Who’s not getting along?  We’re all getting along better than we ever have!
Yes you're right. I just want for us to have cool discussions because what i have coming will ruffle some feathers and i don't want us to start arguing. 
I want grown up discussions and keep an open mind. 
I hate to give one small advice but i would like for all of you to keep an open mind to all sorts of gear and let your ears decide. Maybe if you applied a little of what I say all the time: " I'm not married to any of this stuff" would make it a little easier to keep an open mind. 

kren,
You said, "Sorry Viber I just can’t relate to that logic; never had to settle."
If that means you never had to settle regarding women, you lucky dog.

But for audio, we all have to settle for different sonic tradeoffs. That's OK, but the gorgeous looking Dag electronics would turn me off after 2 seconds of listening, when guitar sparkles are blunted.  At present, I like the sparkles from the Alexx.
I have just posted a poll on my youtube channel. Please vote now to see what the general feeling is regarding the Gryphon Mephisto vs Boulder 2150 upcoming battle !