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

Showing 22 responses by sciencecop

The S5 can play extremely loud without any strain (all reviews and listening sessions confirm that), but you do need an amp that can drive it at high levels. The amp at the NRC probably can’t drive the S5 properly; the impedance is rather low above 2K. There is no other logical reason for that (it is a Scan Speak based Revelator tweeter, one of the best around).
You seem to, rather strangely, concentrate on one thing, did you not see the astonishing lack of THD above 70 Hz (-50 dB for loudspeakers is more than plenty - and most likely impossible to measure outside an anechoic chamber). Feel free to look and compare to all the other speakers they measured; I do that for fun ;)

BTW, that is all history anyway, the S5 Mk2 is superior in all ways to the Mk1, and as you can see from the reviews, it is much easier to drive above 2KHz)
The measurements of the S5 are exemplary, the lowest THD measured at the NRC . The legendary Martin Colloms from HIFI Critics, the last word on loudspeakers design, said (and bought), about the S5:
“Just for the record, … the overall distortion never exceeded 0.1%. For 80% of the span below 20kHz it measured just 0.04% second and 0.03 % of third harmonic. These are amazingly linear results”

“For the science-based reviewer, it is great to see theory so accurately translated into the listening experience. While the S5 MkII may not immediately impress with whizz-bang auditioning, it has power and majesty, excellent resolution, natural timbres, deep, dynamic, authoritative and very well timed bass, combined with huge well focused stereo images. Easy on the ears, you can listen for hours on end to this rhythmically involving and highly musical design.”

http://www.magico.net/images/Reviews/S5/Magico_S5_II_complete.pdf

If you want to compare the "cheap" Magico to the Focal,  someone unbiased already did (to the Sopra 2, which to my ears sound better than the 3 which have way too much bass). 

https://www.soundstageglobal.com/index.php/product-debuts/magico-a3-december-2017/739-magico-a3-loud...


You are right on the money (and if the speakers are new, you heard nothing yet). Once you get it, there is no way back.
Forget about the Alexia (or the Alex). Wilson models just get worse as they get bigger.

You should go back to the Magico before you make a final decision, you are getting smitten by the things that will ultimately drive you crazy (excessive bass). The mid bass regain on these is pumped up, that will be cool on some pieces, but try female vocal or chamber music (: I am also surprised you are not offended by the grainy top end, the S5 Mk2 tweeter is substantially better. 
It is a good analogue, where the road, and all the other inconveniences you describe, can be viewed as your system upstream. However, unlike the road, you do have control over your upstream, and you can ‘fix’ it, so your ride will be as smooth and cool (or choppy and hot if you wish) as possible even at 300 Mph. Magicos are incredibly transparent, they allow you to hear MUCH better what is in front of them. That is all. They don’t push nor mask information, or EQ the sound, they just let you hear what is coming in (Contrary to some reports they are not demanding at all, if you feed them right). Why would anyone want to mask this uniquely, clear window as opposed to start clearing up what’s in front of it?
Here is Myles Astor review of the original S5, he WAS a big Electrostatic guy (ML to be exact):https://positive-feedback.com/Issue74/magico_s5.htm
Electrostatic loudspeakers are a thing of the past. With today technologies, an adequately dynamic multiway design will have all the benefit (and then some) and none of the shortcoming.
@shadorne

Why are you keep misinforming the forum? You clearly don’t know what you are talking about (but, I already explained this to you...), and even more important, IT IS NOT THE SAME SPEAKER. The S5 Mk2 has a different tweeter than the Mk1, and a different XO (easier to drive).

I am pretty critical on nonsense, but even I try not to rain on anyone parade, especially not with false information. Just a bit of courtesy for someone who is enjoying his new speakers.

@whitecamaross
...I believe the Magico tweeter is awesome but it is not built by Magico. It is built by Scanspeak with Magico’s specs...


That is not true. SS build the S series tweeters (which is a lot cheaper).The M series tweeter is a proprietary 28mm tweeter (vs. SS, 26mm) with a much bigger motor system, definitely not built by SS.

I own the M3 for some time now, never had issues, but a friend of mine M2’s needed a tweeter replacement due to mischievous grandchildren. It’s more tricky to replace, but a good technician or a set of good hands can do that easily.
Magico was very helpful in that and provided him with a step-by-step manual on how to do that. Of course, one will be better off sending the speakers in, but that may be the case with any tweeter.

BTW, I find Nordost speaker wire to be a bad match with the M3 (or any Magico I have hard). They seem to chock up the lower region, giving you the impression of more detail. I think they were designed with ported speakers in mind, where you may want to tame the bass somewhat. YMMV

Now you are talking!
BUT, you shouldn't listen to the M3 on wheels. They don’t work as intended like that. Also, make sure you tighten the rods. Once you do all that, you will not miss the Focal as much 😊
@kren0006
all equally disadvantaged I suppose.
Not entirely, a sealed design loudspeaker floor coupling will be more critical, but yes, all speakers should be given a proper setup.
Not giving the products the basic proper setup care is not a serious attempt at a meaningful evaluation. Not everyday one gets a chance to evaluate such an array of fine products, one should at least make the effort of setting them up properly...
I am losing interest :(
There is nothing "there", not a word about any "new" tweeters.
You should actually read it...
Good to verify, it can save you some disappointments!
I am just reporting what I hear. To me, the Focal tweeter is a bit crude (I have listened to focal many times). It’s not just the level, it’s the quality. If you look at Focal tweeter measurements, you will see that the breakup is rather low (~25KHz), and that is probably what I am hearing, a slight but constant coarseness. It’s fatiguing. The M2 tweeter breakup point is much higher (~50KHz), it is much smoother but perhaps less exciting to some. I had the M3 for almost 3 years, trust me on that, without proper set up, you are not beginning to hear what this speaker can do. 
Can you please point me to some information on the new stella EVO tweeter? I couldn't find any references to that anywhere.

So you are 70 plus years old, and playing music, perhaps in an orchestra, which will expose you to +100db of sound pressure on a regular basis for 60 years?? That is a lot of wear and tear on the ears, maybe you like your highs boost 😉
I am only in my 50’s, right behind you buddy (if I am lucky), will probably like the Focal more soon, LOL.
I have seen that, not seeing anything about tweeters, can you be more specific? 
@viber6
Also, FWIW, John Atkinson reviewed a Vimberg speaker for $31K and hinted that they have more HF air than the Magico M2 he reviewed a few months before that.

Perhaps, but you forgot to mention that it is the M2, not the Vimberg, who got his vote for loudspeakers of the year, and by a wide margin (https://www.stereophile.com/content/stereophiles-products-2020-loudspeaker-year).

There is a lot more to good sound than a splashy top end, which the Focals are notorious for. Not all ears are tuned to that (you can look at measurements, if you don’t hear it). In fact, some will argue that they gave Beryllium the bad rap it has.

The magic of Magico is their balance. If set up properly (which our gracious host did not bother to do ☹), nothing stands out, for better or worse, yet it is all there. Some can find it boring, but for longevity, mostly if you listen to ’mildly’ engineered music like Classical and Jazz, they are in a league of their own.(https://www.stereophile.com/content/stereophiles-products-2020-editors-choice)


Sure, will go with that...
Heard the Grand Utopia EM with the big Naim amp. Also, a good friend has the Scala. All using the same tweeter as your Stella, I believe.
@viber6
That is not how it works. Once the breakup frqs are excited, the entire tweeter goes into a convulsion. That is why you want the breakup frq to be as high as possible. Like many metal domes, the Focal tweeter is coarse sounding due to too low of a breakup point, and as I said, even though some don’t hear it, it does not mean it does not exist.
You excite the breakup regardless of SPL, it is part of the driver ’sound’ (Sure, graininess will be louder just like the rest of the sound as you pump the volume up). 
@techno__dude
+1
The Wilson way. LOL

@ kren0006
The reason Wilson stays longer is the pursuit of the so called “promised” good sound if the setup is right. It takes some time to run through all options available and then realize, there is no such thing 😞