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
Cool thx.

I like when you give pronouncements like, "best for the money."  That's helpful to those of us on budgets.

Seems in last video that WC gives very clear statement that in his opinion, the best amps at $10k and $20k pricepoints are both Luxman.  He is emphatic in his conclusion.

I wonder if anyone will try to gaslight and convince us that WC did not say that or does not really think that, but instead prefers something else at those levels????
Two of the more confusing naming conventions:
Lux 509 is more powerful watts wise than Lux 590
Parasound A21 is more powerful watts wise than Parasound A23

Adri's post is a little confusing.

First he says RCA and XLR offer the same "rendimiento" (performance, resolution), but then later says XLR always surpasses ("supero") RCA significantly.

@jetter It´s not only plain wattage. The 590AX runs in pure class A, whereas the 509X (without "a") is AB.
Hi gallus, I'm with you on the class A versus class AB.  Never the less I am programmed to think bigger number = more watts.  Hope all is well in your neck of the woods.

WC you should try and locate one of these Andrea Pivetta amp creations, unlimited power of 160,000 watts!
https://www.onlycreative.it/press/reviewed-all-over-the-world
This will not only shake your garage foundation but your entire neighborhood.
@jetter Thank you and hope you and your loved ones are doing well! According to a very good friend who owned the 590AX and is involved in the industry, Luxman released the 509X class AB because the class A unit runs extremely hot and some customers complained about it - particularly the ones living in warm places. That is the issue with class A, but sounds soooo good
The 590AX is one of the very best integrated amps at any price point, unfortunately I have no experience with the newer 509X and can´t comment.
Here's what gryphon has to say about cables and their amplifiers: (could explain the issue with buzzing???)

Gryphon’s basic philosophy is one of sonic neutrality and Gryphon amplifiers are very special as they are equipped with an enormous bandwidth.  As Gryphon prefers to leave interpretation to the musicians and singers, it is Gryphon’s belief that we don’t need a cable with a particular “sound” of its own to balance or to “equalize” your system.

All Gryphon amplifiers are designed and manufactured with an extreme bandwidth and in some cases the wrong choice of speaker cable can become an issue and will create potential problems in the collaboration between the amplifier and the speakers, with the speaker cable as an interactive factor.

Gryphon recommends to

  1. Steer away from speaker cables for Gryphon amplifier with a coaxial design, active shielding or special boxes that will add-on different types of filtration. A speaker cable with a coaxial design or with active shielding will in most cases have a much lower bandwidth than the amplifier and therefore the amplifier will be met with too high a capacitance load causing oscillation of the amplifier. There is no need to actively add filtration on an analogue amplifier. It doesn’t serve the final reproduction of the music any good.
  2. Use speaker cables with a low capacitance and a wide bandwidth in order to match the specs of the amplifier’s bandwidth and output impedance. From Gryphon’s standpoint, there is no need to add more “negative” filtration to the system given their emphasis to have the finest level of tonal balance and neutrality.

Choose your cables with the highest level of attention to the actual parameters of the cable design (e.g. cable geometry, capacitance, bandwidth, insulation, conductor material and connectors) and aim for low capacitance and sonic neutrality. From that standpoint, Gryphon’s own range of interconnects, loudspeaker cables and power cords are used in the development of Gryphon products. Gryphon cables are designed for ultimate neutrality and resolution. They are extremely revealing and will allow the ultimate quality of your Gryphon system or any fine audio components to come through clearly and undiminished. Do give it a try with your Gryphon units and let us know what you think.


WC, could you rate the best integrateds that you experienced from best to worse cost no object ? ( Dan D’Agostino Momentum,Gryphon Diablo 300, Mark Levinson 585, Luxman L-509x, Bel Canto Black, etc. )
And which one of those would be the best for the money ( value) overall.

I have a pair of Goertz Alpha Core speaker cables, and to quote Almarg from 2012
Their ultra-low inductance is achieved at the expense of ultra-high capacitance, and if a Zobel network is not used that can cause some amplifiers to oscillate, and possibly fry.
Which is what I thought was happening to your amp.  Without going back and rereading what you wrote previously, I believe you said it was only impacting the sound from one speaker which is confusing.

Check with your experts, but AFAIK you would only need to add a set of Zobel networks to your speaker terminals to cure your problem, if you like the offending speaker cables, the same as with the Alpha Cores.  It use to be easy to pick up a pair of the Zobels from Geortz for a few bucks, of course no longer.  You may have to have a pair made which I expect would be inexpensive, and plans are on the web.



1. Agostino
2. Luxman 590axmk2 
3. Gryphon diablo 300
4.Luxman 509
5. Belcanto Black integrated 
6. Mark Levinson 585 
Wow the Luxman 590 axmk2 creaming the Gryphon Diablo 300 and Bel Canto Black. 😲
If you hear the luxman 590mk2 with cardas clear beyond speaker cables and Wilson Daw....you'd swear it's the end of the road ...
WCSS, been reading this thread since inception. You have helped me along the way on the thread and pm’s. Thank you!
Here are a couple of pics of latest configuration; you are spot on calling the m900 “Rocky”. This amp is incredible!
https://imgur.com/a/SH2DCxw


Wowww I love your set up. I want to hear those Dynaudios....man, great job with what you’ve done. It looks so neat and organized. Nice panels on the wall. Based on my recollection of Dynaudio and luxman, I GUARANTEE there is massive synergy with what you got. Wow well done sir !

Yep: luxman 900u is ROCKY for sure. It doesn’t get phased by any damn thing. Have other amps bested it in my room ? Yes but there’s a difference between getting edged out and getting smoked. I have never had an amp that smokes the luxman 900u. Not the xs300s, dag m400s, rowland 925s, gryphon, etc etc. Nada. It is bested but not smoked.
One last thing, it is the one amp that wipes out my short term memory when it comes to other amps I've had. Makes me not really miss any of them .
WCSS, thank you for the kind words. I love these Confidence 50’s; they are very special.
Let me know if this works:

https://youtu.be/nwXnxSmpVhI


I’m quite sure YouTube compression plus my iPhone 11 has rendered a poor audio stream. I’d like to figure out how to maximize resolution transfer from a 1080 vid to end user;
Seems like Wilson DAWs and Cardas Clear Beyond speaker cables don’t get along when high current is going through. The Gryphon amp doesn’t like it.


Something in the Wilson Crossovers PLUS Cardas cables ( very low capacitance) with high current going through makes the Gryphon amp cry for it’s mother. 
WCSS; I’ll post more, but the short answer is the complex load of the Cardas-Wilson at idle, is causing feedback loop instability; if you added a parallel pure resistance such as 10 ohms across the speaker terminals, the oscillation will likely disappear. I suspect the Gryphon has very little global feedback overall; why in the left channel? The tolerances of the components of the left pcb come into play plus possible bias current is out of spec.

Interesting explanation. I almost sent my gryphon in for service but I was told that there is nothing wrong with it based on what you all saw. It is just the combination of cardas and Wilson that creates an environment that makes the Gryphon act up this way. 
Try playing a test tone of say 30 Hz and see what happens to the baseline hum. Also, have you tried playing music?
1236 am:
Dynaudio c4 platinum with the very best components and cables I have is right now blowing me away. HUGE TALL WIDE SOUNDSTAGE. Gryphon with cardas clear beyond speaker cables , dcs and luxman preamp are totally making the Dynaudio their b@tch and really pushing them. I'm super impressed!! Video to come !
@viber6 

Out of respect for WC, I'd like to keep my adventure out of WCs thread. To answer quickly, I have the M2500 amp. With the matching preamp and E1 speaker, there is good snap and sparkle with excellent tone and texture and a three-dimensional soundstage. If you'd like to know more, you can IM me.
@ denon1
"Tears Run Dry" by Malia and Boris Blank
from the album Convergence released in 2014.
get the App "Shazam" on your phone ?
It comes in very handy.
whitecamaross
Nice video- you will notice quite a difference in sound quality during midnight to early am hours. Enjoy the music.
Happy Listening!
@whitecamaross  that's awesome about the C4 performance. The Dyn tweeters are incredible masterpieces-- top shelf resolution extractors yet sweet and musically engaging.  The DDC approach which is designed to focus the energy toward the listener (reducing room interference) also helps the image scale.
Can you please comment on the low end "grunt" or "authority" between the Gryphon and M-900U on the C4's?
I heard very little difference over my PC monitor speaker setup. 
Thank you,
Dave

vibe6 For God's sake, shut up a bit, you are absolutely unbearable !! For each WCSS post you do 3 or 4 giving explanations, which matter little and the only thing they do is make it unbearable to read everything !! I have been reading the whole history of WCSS for 15 days
WCSS 4-17-2020

Gryphon recommends to

  1. Steer away from speaker cables for Gryphon amplifier with a coaxial design, active shielding or special boxes that will add-on different types of filtration. A speaker cable with a coaxial design or with active shielding will in most cases have a much lower bandwidth than the amplifier and therefore the amplifier will be met with too high a capacitance load causing oscillation of the amplifier. There is no need to actively add filtration on an analogue amplifier. It doesn’t serve the final reproduction of the music any good.
  2. Use speaker cables with a low capacitance and a wide bandwidth in order to match the specs of the amplifier’s bandwidth and output impedance. From Gryphon’s standpoint, there is no need to add more “negative” filtration to the system given their emphasis to have the finest level of tonal balance and neutrality.

As I indicated in my post dated 4-12-2020 the Cardas Clear Beyond cables are the antithesis of low capacitance, at 446 pf/foot, although they are not as high in that respect as the Goertz cables Jetter mentioned. And Dpac has provided a good explanation of why the problem only occurs in the left channel.

Also, as I mentioned in the earlier post the DAW’s impedance is significantly capacitive in the vicinity of 60 Hz, which is probably contributing to the issue and putting the amp’s left channel over the edge.

I agree with Jetter and Dpac that a Zobel network, or perhaps even just a 10 ohm resistor capable of handling the necessary high power levels, would likely solve the problem. But basically everything seems to point to the Clear Beyond being the wrong cable for this application.

I’ll add that a primary design goal of the Clear Beyond was presumably to provide ultra-low inductance (0.01 uH/foot, in the same general ballpark as Goertz), with the high capacitance being a side-effect of the particular design techniques Cardas used to accomplish that. But IMO such low inductance is overkill by a wide margin. Especially with speakers such as the DAW (and many other dynamic speakers, as opposed to electrostatics) which have an impedance which rises at high frequencies. (The impedance presented by an inductance is proportional to frequency, and will matter less if the speaker’s impedance also rises as frequency rises).

Regards,
-- Al


Cardas made them to go « beyond » imagination...

...so that you can cannot even start imagining the kind of trouble you’ll have with them.
So when can we hear about this...???

"I will also give a nice discovery on WHAT made a huge change on the luxman set up which will give you all luxman owners want to grab your checkbooks to chose what i will suggest you should buy."
Bad news people.. Florida just shut down schools for the rest of the school year. This is not good for anyone.  Hang on to your hard earned money. Not the right time to buy. 
Schools are shut down in Illinois too. Happening across the country. I’m in need of an amp and it’s terrible timing. Nothing is open. Thanks Emotiva for a broken promise. Flagship XPR amp that you won’t fix.... you claim parts are no longer available but these come from China. They copy everything. You can find a replacement supplier if you try....
........
@whitecamaross

I'm surprised you haven't tried Accuphase, from the love you been showing Luxman.A few threads a few years back had the two being compared & a lot of people seemed to prefer the Accuphase over the Luxman in direct comparisons.

The Accuphase M-6200 or the P-7300 seem like they would be right up your alley.
Which speaker is #1 and which is #2?  Or is that intended to be part of the suspense?  The Dynaudios were never shown, and DAWs remained in same spot for both clips, meaning dyns (assuming they were playing in one of two) had positioning very different than daws. Not saying that’s wrong just an observation. 
My tongue in cheek conspiracy theory is both were daw with different power conditioners (Denali and AQ). 😂 
My guess is that "Speaker 1" was Dyn and "Speaker 2" was DAW.  I thought clarity on 2 was maybe a bit better; I thought 1 sounded bigger but maybe a little sloppier?  Can't really truly judge them though given my limited and poor playback options.  Still fun though.