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!


jays_audio_lab
@whitecamaross
WC, thank you so much for all your efforts and hard work. wow this is a legendary thread you have been running for so many years and you are giving us frank unadulterated end user view of the components.indeed very rare and valuable.
on a slightly different note if i may ask you. as of now, as per you, what are your top/best  5 pure analog only integrated amp say from a price range of 9k to 15k USD that you know of or tried.would be great if you can rank it from your perspective.
Very interesting WC. As you know, I am a big believer in less is better regarding hi end audio.

Never forget that the dcS dac is a reference ultra high end piece, with a very good preamp section build into it. Modern audio is undeniably going in that direction... Preamps with dac modules included, or dacs with preamp section included. This is why I own the C47 McIntosh preamp ( coupled to a Luxman M900u ). One piece replaced two , got rid of the extra powercord and set of interconnects. And the modern dac I got rid off was seriously no joke at 6k usd msrp.

AND also, market will keep developing better all in one integrateds. But thats for another subject.
Well, if one has a turntable, that's a reason why someone would need a preamp.  And many dacs, such as my esoteric k01x, do not have a volume.  Many do, but are definitely not at the level of your dcs Vivaldi. 

So it's a mixed bag, but I see your point. 
So as i sit here tonight listening to the DCS VIVALDI connected to my luxman 900 u amp i realize that at this level there is a HUUUUUUUUUGE law of diminishing returns. I can HONESTLY SAY that having a DCS Vivaldi and using it as a preamp pretty much puts in your hands a dac that beats probably 60-70% of the preamps out in the market today and the 30% of the preamps that can beat this dac probably cost as much if not more than this dac. Right now, and although it is a preliminary feeling, i could easy sell the Ayre Preamp RIGHT NOW and any other preamp i have owned and use that money instead to buy the clock for the vivaldi and more AES, BNC cables for the dac to elevate it.
Here is what i have gathered after living with the DCS Vivaldi:

1.A WELL DESIGNED DAC is probably able to do a 2 men job: Dac & Preamp AS LONG AS YOU LISTEN within reasonable volume levels
2. If you need horsepower, big volume levels, your room is huge and needs to spread a ton of air in order to fill it, no dac will EVER best a well designed preamp when it comes to this.

In short, let’s say you have 30k to spend and you are thinking this:

1. 30k DAC
2. 15K PREAMP 15K DAC
3. 20K PREAMP AND 10 DAC

If you have a small room, don’t listen at pretty big volume levels, go with option #1 10 times out of 10.
If you have a relatively large room, big speakers, sit back pretty far, have other sources that you need to connect such as a turntable, etc then go for option #2 or #3.
I FINALLY ACCEPT TODAY that no preamp, HAS EVER bested a dac when it comes to the purity and detail at low level listening. EVER, EVER EVER and if that preamp exists, i have not met it and to be TOTALLY honest, WHY would i spend another 20,30, 40k to hear THE SAME THING that i am already getting at low volume levels? it is stupid. Save your money people.
In short, and the take away from this should be that your volume level and room determine what works best as a preamp.

I almost spent a pretty penny by buying some top end xlr cables to go from my dac into the Ayre and then use my odin xlr from the ayre into the amp, but i hit the brakes instead because i want to first convince myself that a preamp is indeed what i need to have here. Don’t be surprised if i end up moving forward with just a Dac and completely killing the idea of a preamp for me, my room and listening habits as of late.

Yes, i still own the Ref6SE, Luxman 900u preamp and now the Ayre KXR TWENTY so i have more than enough to make a decision when it comes to owning a preamp. If i decide not to, you all can be sure that i did ENOUGH testing and listening of my own that i just don’t need a preamp anymore. Granted, i have serious cables and a supporting cast for this dac that really makes it work that much better, but i need to feel like having all this money tied up in a preamp is indeed worth it because i am getting something i can not live without and this will be the exercise i need to endure over the next few weeks.
This Ayre Preamp will be the final nail in the coffin for me. If this preamp STILL does not convince me to keep it for at least a few months then i will sell all my preamps and close the "preamp" conversation for me. Yes i will still try a preamp here and there because i want to try whatever new preamps come out and nothin else. Remember, for me the investment is rather large and if a preamp CAN’T do MORE than what my dac already does then that is redundant for me and i rather put this money on something else like a second pair of speakers, etc.
I understand how thezaks liked the sound of the Cardas when he listened to that first. Although I enjoy the greater purity of the music and get closer to the music with the Odin, especially in the background instruments with their HF overtones, I believe that the system’s overall purity is due to bypassing the preamp. When the Ayre preamp is broken in enough, I hope you do a video with and without the Ayre. You could use the Cardas straight from the DCS into the amp, and get more purity than if you used Odins from the DCS into the Ayre, and then into the amp. For purity, there is nothing as important as bypassing the preamp, assuming for that particular music such as this one in your video, you have plenty of volume.

For those who want the dynamics and bloom that a preamp adds, I will ask you to think about comparing the purity and delicate taste of freshly picked corn to several days later. There is no contest, and everyone would agree that fresh brings out the max in range and delicacy of flavors. For ultimate listening pleasure, think of the purity of the music as you would think of the purity of the taste of fresh food.


whitecamaross

2nd Note-
Ayre incorporates the technology from your pre-amp into the company's Integrated amp (AX-5 Twenty). It is superb at its price-point.

Happy Listening!
techno__dude:

I would definitely agree with your statements about service to music and technology for those two components. It will be interesting to see if WC comes to the same conclusions, after spending time with both. Some will prefer one flavor and others will prefer the other. I guess we’ll get to have somewhat of an opinion too, after we watch the video.

WC:

I watched the XLR comparison video. It’s interesting when you start with the Odin and then go to the Cardas - it almost seems muffled at first when going to the Cardas. So, I waited a while and then went back to your video and listened to the Cardas first, and then I listened to the Odin. While I can still tell the differences, this time I found that I kind of didn’t like some of the things the Odin did vs the Cardas. I can now understand why the Cardas would be preferred by some.
Dave
whitecamaross - I forgot to mention that I very much like the Audio Research house sound:  huge soundstage, silky lifelike mids, textured bass, airy highs.  

I actually love the sound I get now with my GS150.  The reason I am even making this change is to get a little deeper bass, a little more detail without getting analytical sounding, and definitely to reduce the heat in the room.  The GS150 is like having a heater in my room.

jbrrp1 - That's great to hear!  very promising.  I don't want "too much" detail in my system, I like a tubey sound, but not too veiled.  That's why I prefer Audio Research in general, I do love their house sound and I don't want the Luxman to detract from that, but support and enhance it in the lows.
@2fastdriving   I have the ARC Anniversary 40 working with the Luxman M900u in my system, and I love the combo.  They are feeding TAD CR-1's, which are pretty finicky.  The ARC pre added the right amount of tube with the amazing Luxman amp.  I'm guessing that the Ref6 will mate well, too.

I also have the C900u pre, and it is clearly just an outstanding preamp, as well, but not the right flavor for my speakers.  Too much of a good thing in combo (the TAD's need some pull back from detail, IME).  Now, the Luxman combo was so good together that it did get me pondering for awhile whether I should be looking for other speakers....  I just decided that the speaker change was too big of a "zig" for me and my room and all of that.
This could be a great question that i can answer on my next video. Look me up on Youtube. Luxman C900U vs  Ayre KXR TWENTY shootout is happening this week. 
whitecamaross,

I have been reading your thread and watching your videos with great interest. 

I have Alexia one's with all-esoteric digital and Audio Research Ref6 (soon to be SE) and GS150.  I just purchased a luxman M-900u based partially on your enthusiastic reviews.

I noticed you have had a Ref 6 and SE in the past, but went back to the Luxman preamp to pair with the power amp.

Can you briefly tell me, how do you think I'll like the switch from GS150 to M-900u, and how well do you think the Ref6 pairs with it?  Even if the Luxman pairs better, what are the differences.  I could perhaps move to the Luxman in the future but would prefer to keep my Ref6 for a while if I'm going through with the upgrade.  Plus I just love ARC.  

Thank you!
whitecamaross

Good to see the Ayre in your system.
Nice video on Cardas v. Nordost.

Happy Listening!
I listened to the Ayre KXR TWENTY some more last night and i can say this is THE VERY FIRST preamplifier that has EASILY shown me the difference in sound quality between streaming (TIDAL, QOBUZ) and local files (flac, dsd, etc). i will expand on this later. 
Techno-dude.
" Luxman is technology to the service of music.
Ayre is music to the service of technology."
What does this statement mean?
The difference between Ayre and Luxman:

Luxman is technology to the service of music.
Ayre is music to the service of technology.

Looking forward to learn the differences between those two preamps in WC’s system.
Whitecamaross,

I am glad that you are trying the Ayre KXR 20 preamp. I had suggested that you should try it a while back. I own this preamp and it is amazing. It is also John Atkinson’s (stereophile) all time favorite preamp.
Ayre KXR TWENTY Preamp with Luxman 900U amp is AMAZING. I might be detecting just a tad more brightness than i’d like, but it could be that it just needs to settle in for a few days. More to come on this amazing preamplifier. Could it be my top Solid State preamp of all time?
We will have to find out :)

PS. The response to my Cardas vs Odin 1 xlr has been incredible and i just uploaded it. Do you all see HOW you can actually hear a difference with just ONE SINGLE cable being swapped out? 
Yeah sure, as if those cables are not enough expensive to begin with.....
Well thats good news then.
Personally, I would still not want to be caught with cables and take a hard hit if they never reopen. But thats just me.



If the cables in question are actually highly regarded and or sought after, and the company goes out of business, they might actually go up in value.
WC,
For power cords, did you compare AQ Hurricane HC to Nordost Odin 1, with amplifiers or with Denali or Niagara 5000 power conditioners?  It seems easier to find used power cords with 15A connectors.  Getting 15A to 20A adaptors could work, but maybe introduce compromises.
Well thats good news then. 
Personally, I would still not want to be caught with cables and take a hard hit if they never reopen. But thats just me.
Guys,
Audio Research, McIntosh, and JVC also closed doors in April.... Wireworld wasn’t the only brand that closed temporarily...

I would not touch that brand with a 10 feet stick. When they say it’s closed, the gear resale value usually takes a dive.
I just received a quote on Wireworld last week.  The dealer told me they were open again.
riaa_award_collectors_on_facebook
Wireworld is now closed...has been for about 1 month
It is not completely closed. One of my dealers can have new WW product built and shipped to you.
Most likely the perceived air in Wireworld cables is due to attention to the inherent directionality of wire. Whereas Cardas apparently overlooks it. There, that wasn’t so hard was it?
People out of work wondering how they will pay their mortgages or rent or if they will be out on the street.  Hoping they can feed their families.

I hope they and many others can reopen soon.
The general feeling is cardas is meatier but lacks the air of the Wireworld.... You all wonder what Odin 1 xlr and Wireworld Platinum 8 Speaker cables sound like ? ... :)
Wireworld cable sounding better, more right somehow, just to me too. 
Michélle 
WC you are so right it's all about your own preferences. I for one want musicality over anything if it ain't musical I can't get involved and to me there's no SOUL to the music. I stated it way back when you were listening to the Audiomica cables I thought they sounded so musical in your system it was eery. I've switched from Cardas to Audiomica and now can listen for hours and hours and hours. Does it have the tightest bottom end? Who cares! Does it have the most extended top end? Who cares! It just makes my foot tap to the beat of the music and get lost into another dimension that puts a smile on my face. Enjoy your journey I still look forward to your posts.
I preferred Cardas to Wireworld. Thought the bass through Cardas sounded more substantial and also tighter.

Would have to listen some more to see if I prefer WW to ????

Again, that Luxman and Wilson combo is really nice.
it is all about preferences... long listening sessions regardless of the volume level. Nobody is wrong or right for listening at low, moderate or loud volume levels because that becomes preference. I personally listen at all volume levels so finding a balance is key for me. 
Right now, about 3/4 of the comments on my youtube channel are leaning towards the wireworld presentation. It seems to be more balanced for many people. Which one do you all like?
WC,
Your choice would be easy once you accept the fact that very loud listening distorts the music.  Even most live, unamplified music is at natural modest volume levels.  All of the music on your videos is most lifelike at modest SPL's.  But when certain pieces are too loud, it is unpleasant.  In my first row seat at a live, unamplified concert, I cringe briefly when it is too loud, but then love the crispness the other 99% of the time at the low to moderate SPL's.  The more accurate component at moderate SPL's will give more excitement than blasting the whipped cream/veiled type of sound.

As I wrote above, getting the most natural detail and resolution serves the appreciation of all the subtleties of the music, which is EMOTIONALLY rewarding.
Really enjoyed your last two videos WC and love the 3rd teaser. I hear my preference but I don’t think holding my iphone to my right ear does it justice ;). Really amazing you are also then getting to do the combo described above. Running Odin myself I can understand how going into the high 80db-c avg and above could make me want to switch out a couple cables (for me this would be less than 5% of the time). I also have experimented w the cardas clear beyond pc. Not sure your comparable low/mid/high volume levels though. I do hope folks keep posting their thoughts on the thread here. It is such a great community and obviously all are welcome. I understand why switching over most/all commentary ultimately to utube may be beneficial. Sounds like some regular contributors have already migrated over. will miss their contributions. Keep enjoying the music!
12:23am and i am in such a battle right now. The luxman 900u preamp with odin 1 coming from the dac and silver 8 wireworld xlr from the preamp into the gryphon along with wireworld platinum 8 speaker cables  sounds INSANE. Fast, clean, clear, crystalline, big, detailed, dynamic as HELL, but it does not have "soul". It just gives you the facts, without any sugar coating.
I then proceed to swap out the odin 1 xlr and replace it with the cardas clear beyond and i hear fullness, smoothness, musicality and SOUL... BIG SOUL in the music, but lacks the dynamics, ultra resolution of the odin 1.  It is SUCH A DIFFICULT choice to be honest. Some could argue that "the facts" are what they want and others could argue "musical and emotion" is what they want and NEITHER ONE is wrong. Neither camp is really wrong because it is a matter of taste. I am so blessed to be able to have both here, but i just CAN NOT pick one over the other. I JUST CAN'T guys. If i am in the mood to listen at low-mid levels, the odin 1 xlr is just the ticket to indulge in a massive amount of detail and resolution, but if i want to just floor the gas pedal, cardas just takes you there as smooth as possible without making you turn it down, but you lose the feeling of the road (speed bumps, pot holes, etc are all absorbed and vanish). 
Can't do anything with MIT. I won't go into detail as to why but let's just say their practices aren't extremely friendly. 
I have a LOT of experience with MIT cables - like 20 plus years. Man, I'm old :-(
Anyhow - to me, they sound natural. One has to hear live music to make that comparison. With a high quality system, you can hear the artist's performance and the venue it was performed in.
And - no, I am not associated with MIT in any way other then being a consumer.
I did find a cable I like better, and became a dealer. Honestly - after trying to help people get their system properly set up (including room treatments) and performing to it's best potential, I gave up trying. Most of us have no idea how many people have pretty decent equipment that is poorly set up. How in heck will they determine any component's performance? Many dealers included!
Last time I invited a friend over - he was in disbelief how our system sounded. I couldn't make the investment we made without getting lifelike performance. Just my 2 cents.
@whitecamaross Have you had any experience with MIT speaker cables or Transparent? My WA dealer also carries MIT and recommends them for Sashas. I wanted to try Transparent first, but according to the dealer the MIT technology is far superior:)
Thanks, Aziz.
Thanks for your recommendation that for clarity, go for the AQ Niagara 5000 plus Hurricane power cord feeding it.

"Emotion" means many things to different people.  In my case, when I hear more clarity, that leads to a better appreciation of the intricacies of the music I love.  Greater love and appreciation=emotion.  Also, more snap/sizzle (without excessive volume) = more excitement, that type of emotion.