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
grey9hound,
Thanks for your further assessment of the Tektons. I read the reviews, and can say that your comments are the most useful, in part due to the honest tone set by WC on this thread.  I agree with you that anyone considering dynamic speakers at any price should be mindful of the Tektons.  I also endorse your ideas about room correction, even though I never tried the Lyngdorf.  I will go a step further, and now reveal my most controversial idea yet, which will earn HOWLS of protest and derision by many sanctimonious purists here.  Drumroll....  
      The absolute necessity of an equalizer.  I have been using my $600 Rane ME60 equalizer for 23 years now for both recording and home listening. It is a stereo 32 band 1/3 octave from 20 to 20,000 Hz, with each of 32 bands adjustable from minus 12 to plus 12 dB.  The newer model has a choice of 2 curves centered on any band and another adjustment of minus 6 to plus 6.  It is old fashioned analog but widely adjustable as you can see.  I started recording my orchestra without the EQ.  The hall is a medical school small auditorium, and the stage a small boxy affair not designed to fit an orchestra, but just a lecturer and a few things.  When the conductor noted that my recording sounded heavy and dead, I then tried the equalizer, cut the overblown bass and boosted the highs.  All very tastefully done, not with the aid of instrumentation, just by ear.  After that, everyone was astonished at the clarity and impact. Nobody accused me of sound manipulation or thought the sound was artificial.  At home for playback of commercial recordings that are usually recorded to give a more distant perspective than the close one I prefer (although the commercial perspective is still much closer than a typical audiophile likes who goes for the midhall sound), I boost the highs which makes the more laid-back recorded perspective sound more like the exciting sound I hear from being on stage immersed in everything.  This works because high freq are the ones most drastically lost due to distance, so I compensate.  Also, when I play my violin, the sound under my ear is MUCH more detailed than most any listener hears from a distance.  I can skillfully equalize most recordings of solo violin to sound like what I hear under my ear. Your sound preferences may differ from mine, but you can experiment with the equalizer to get the sound you like.  If anyone says that all this is manipulating sound and making it arbitrary or artificial, I say you all are doing just that with flavoring your particular soup with different preamps, cables, cartridges, different tubes, caps, fuses, etc.  Most manipulations of sound are by speaker designers who make their personal choice of colorations and tradeoffs that THEY like.  The next biggest sinners are recording engineers with their arbitrary choices, especially with processed rock/pop music.  For ultimate sonic thrills, sit with me on stage or hear an outdoor unamplified performance up real close.  Aside from that, which is what we are all forced to do with our commercial recordings, adjust the playback with the equalizer to what you like.  For those of you who respect my sincerity, I can assure you that small tweaks of the EQ sliders will make much more of a difference in the sound than the differences between many amplifiers. If I were a shady audio salesman, I can get the customer to like any particular amp best, depending on a subtle EQ adjustment, all tastefully done to make it not obvious.  Without my Rane EQ, there is no amplifier at any price that will give me the musical satisfaction I would get with the EQ and many modest amps. I still appreciate the better accuracy of a better amp, but this still is using the amp WITH the EQ.  Another benefit is that my Rane has a volume control which enables me to get rid of the preamp.  At the time I got the Rane, I was using the Spectral DMC gamma preamp, but the Rane electronics set to flat (no EQ use) was more revealing and transparent than the Spectral, so I happily dumped the Spectral.  Bypass tests showed that the Rane is very transparent.  Go try to find a totally transparent line stage preamp, but the point is moot because I consider the EQ a necessity to get the sound you really want.  The only sacrifice I make is that the Rane is not a control unit, so I have to unplug to get another source.  For those who feel that a preamp is necessary to get better dynamics (although they will admit that transparency and information retrieval is sacrificed more than a little), that's OK, just insert the EQ either before or after the preamp.  You'll still get the benefits I describe here.

klh007, thanks for your interesting observation about the tweeters of Tektons.  I feel that dynamic tweeters are inherently superior to larger midrange and LF drivers, because they are smaller and more sensitive, lower mass, etc.  BIGGER is often WORSE, as in size of drivers.  So it is clear that much of the midrange is more accurately handled by the better tweeter, if you have enough tweeters to get the dynamics required.  Dynamic tweeters can have electrostatic clarity, but forget about dynamic drivers for comparable midrange clarity.  In this case, the several tweeters extend the electrostatic-like clarity into the midrange, so it is appropriate and interesting that you make an analogy with the ML hybrid stat.
Interesting discussion guys. Lotd of great information being shared which is what this thread is all about. 
As far as Tektons, I did look at the website and read a few reviews. Very interesting brand which could be an option down the road. That said, I want to make people aware that I have to keep my budget spread across different pieces. I can’t put 75% of it into speakers and the other 25% in amps, preamps and sources. For right now I want to keep going with the magico. 
That said, I want to share what my definition of neutral is based on my experience. 
Neutral: I think of it as any component that does not add or take away from what is being fed to it. It has no character of its own and this gives it somewhat of an analytical sound to it that many times could actually make you feel like they have no character. Perfect speaker would be the revel salon 2. That speaker sounded anemic when I first owned them and I didn’t know why. I tried many things to fix its lack of bass then many months later I got a second pair and by then I had a better front end. I was using the ref6 as a preamp and I think a pass labs amp or something like it. I recall I wasn’t ever happy with its bass and then I got my hands on the ref10 for the first time and all of a sudden I was hearing bass I didn’t hear before. I felt the room pressurize etc. I will never forget that 
Point is that neutral components do have a special place but quite often they are so rough dial them to sound how you want. A lot of work goes into this. I personally don’t like neutral amps too much. This doesn’t mean I wouldn’t try them but I rather not because they never seem engage me. 
Does anyone ever just pick up a record, drop the stylus  and sit back and enjoy a song?..without critiquing your system?

..i didn't think so.     

  i sure  don't.      wish i did.    wish i could.

the curse of the audiophile.