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!


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Showing 27 responses by shadorne

@whitecamaross


Did you compare C1100 to any other Mcintosh tube preamps?

I agree for power SS that Pass Labs is equaled but never surpassed. The 350 is a musical beast.
Nice review. I agree with your comments - especially the Luxman.

While a 31K source might not be limiting, have you considered your speakers? This particular Wilson (Sasha 2) is my favourite Wilson but it is not the last word in resolution. Harshness can easily come from the speaker...especially when driven hard. A different speaker might give you a different result.
Vivid Giya G1 is like the 4 driver B&W Nautilus - same designer. More bass.
@whitecamaross

Much of the design philosophy of Vivid comes from B&W(Lawrence Dickie)

https://goo.gl/images/gbnFxP

They are are not the same speaker but share almost the same design platform (driver size, crossover and cabinet structure). I would hope for you that the Vivid G1 is an improvement upon all the lessons learned at B&W and therefore incrementally better than the Nautilus. The Nautilus is a legendary design and so is the Vivid G1. At this level it is extremely positive to have a speaker designed and built by someone with such huge experience and technical know-how. You can be confident in the benefits the historical context brings. Like a great racehorse - ancestry can be important as the offspring are more likely to be great racehorses too!
@techno_dude   

It is too hard to do concentric speakers with multiple drivers as well as individual drivers each perfectly designed for their frequency range - too many compromises. However, a large multi-driver speaker won’t sound integrated from 3 feet away. So large multidriver speakers are limited to farfield listening.

Horses for courses....
@whitecamaross

Yup. Just as I stated. Vivid are like Nautilus but with a lot more bass - too much bass by your account and actually no surprise to me.

The Focal Sopra 3 is a step backwards from Wilson Sasha 2...the waterfall plot says it all - unwanted resonances everywhere. Nice even dispersion though. Definitely a great speaker but a step back nevertheless.

https://www.stereophile.com/content/focal-sopra-no3-loudspeaker-measurements


Any pics of WC setup? I am starting to have trouble believing this thread. Nobody buys Vivid G1 and then unloads them in less than a week or at least nobody with sanity. Along with all the other changes since 2015 it just seems too crazy to be credible. Like a drunken walk - somewhat random. The only thing that would make sense is if WC is a dealer - maybe I missed that somewhere.
@whitecamaross 

Great you have pics! Thx to post a few. A pic is worth more than 1000 words and you are well over 10000+ words on this website.
Be careful. You get what you pay for. A deal is offered because neither of these speakers are good quality (if you talk SOTA) but rather offer big margins for dealers.

Measurements of Sopra 2 at Soundstage are terrible

https://www.soundstagenetwork.com/index.php?option=com_content&view=article&id=1445:nrc-measurements-focal-sopra-no2-loudspeakers&catid=77:loudspeaker-measurements&Itemid=153

same issue with Magico

https://www.soundstagenetwork.com/index.php?option=com_content&view=article&id=1043:nrc-measurements-magico-s5-loudspeakers&catid=77:loudspeaker-measurements&Itemid=153

Both suffer from huge linearity issues at a mere 95 dB. These are terrible designs if you are talking SOTA. If you are looking at the speakers then they are both fantastic looking for the money (aesthetics is 10/10) but neither is worthy of 90% of the amplifiers you have tried. Perhaps the Mk2 and the version 3 are better but these measurements indicate both of the prior versions are LEMONS!

No wonder you got such great deals!

You cannot compare Vivid G1 to either of these speakers. This is not in the same class or league at all. Frankly, you are leaning towards gorgeous looking but mediocrity in sound rather than SOTA sound that you pursued with Vivid.

Of course relatively speaking these are still excellent speakers and better than most but not the same league or what one could call SOTA.

I really don’t understand the randomness in this excercise. It seems pointless to buy stuff just for resale value but there are crazy folks like Steve Gutenberg who preach this strategy. YMMV but this is the direction of mediocrity (me too components) rather than SOTA.
I Don’t understand the statement “lowest THD measured at NRC” - the measurements are good (excellent speaker) but simply cut off at -50 dB. I can’t find the statement in any of the articles except the Magico website.

What is concerning is the deviation from linearity - the plots show 3 dB of driver compression at 95 dB SPL. This is not very loud. This level of performance may be excellent but not SOTA. It may not show up as distortion but the sound is clearly not remaining properly balanced at increased sound levels or with large dynamics. The plots show increasing dynamic compression as SPL increases and suggest that at 100 dB the treble is down about 6 dB. 
@sciencecop

I am surprised the NRC amp cannot drive 4 ohm load at high frequencies - very little power required as the tweeter is 94 dB sensitivity - so at 95 dB SPL perhaps only a couple of watts? So I am still puzzled - perhaps the sensitivities or linearity simply doesn’t match the woofer and mid range so balance varies with SPL? Seems more likely that the voice coil is heating up and resistance increasing and sensitivity is dropping as power increases? Could it be crossed over too low for the tweeters capability?

@dguitarnut

I think WCSS is chasing SOTA in amplifiers and therefore I assumed the same in speakers. Both speakers (focal and Magico) are excellent and better than 99+% out there. But NEITHER are top of the line even for each manufacturer...so I think SOTA applies here to Vivid G1 but not the other two. Also the performance niggles that I point out are minor and irrelevant to most people except someone (WCSS) who has tried 30+ high end amplifiers and is replacing an already very good speaker (Vivid G1)!

For record, I state again - both the Magico and Focal discussed here are on the whole absolutely outstanding speakers...just not quite SOTA.




Agreed, Magico S5 is also SOTA. It is all relative anyway. I would be happy with Magico S5 although I don’t aspire to SOTA as my goal is more towards classic design with history and proven track record - designs that have withstood the test of time. The S5 is a really Great speaker (sorry if I repeat myself multiple times)
@whitecamaross

Your mid range comments...

Magico S5 does not have a hole in the mid range but there is a significant impedance dip. Perhaps the amplifier is not keeping up.

The Focal Sopra 3 has a rather noisy cumulative decay - mid cone is resonating - perhaps you hear this splashy delayed resonance...
@respected_ent  

Piano is typically 110 dB SPL when played loudly - far louder than most home audio systems can achieve without sounding terribly distorted.

Don't forget the full name is 

pianoFORTE
@melbguyone   

just referring to the impedance plot - check out the dip in the mid range. This might explain what WC is hearing in the mids (the amp can’t fully double down into a low impedance load.)


Obviously not interested in listings from a year or two ago. Many here would like to see of some of this wonderful gear in your home setup - you know - the audiogon systems that many folks post. Surely you have a digital phone or iPad with a camera?
“I must have blasted my magico today to beyond concert levels and these speakers remained composed. Not an ounce of compression. I’m very impressed.”

Oh really? Looks like severe compression at a mere 95 dB SPL to me

https://www.soundstagenetwork.com/images/stories/loudspeakermeasurements/magico_s5/dev_95db.gif




It’s a deviation from linearity plot.

“Deviation from linearity - Measured with a frequency sweep across the audible spectrum on axis at 2 meters.

Purpose: Shows how a speaker is stressed and if it compresses at certain frequencies as the sound-pressure level is increased.

What it tells you: As volume increases, all frequencies should rise at the same rate. However, as a speaker is stressed, compression will occur at certain frequencies. The stress may be mechanical, thermal or otherwise. This test shows those frequencies at which deviation occurs as a result of compression. ”

95 dB SPL is hardly concert sound levels
@sciencecop   

So the S5 Mk1 is nothing like the Mk 2. I’d like to see the linearity measurement repeated on the Mk2 until then all we have is the previous version.

If the S5 Mk2 is a fantastic speaker, what do you think of the Mk1 and why did they replace ALL the drivers as well as the crossover ?


“Shadorne is a troll......he is the infinite audio expert............take his worthless word for it.      If you can’t offer facts keep you mouth shut if you can’t contribute to the thread”

Just trying to inject some rationality into all the hyperbole.  Don’t worry about the owner not enjoying new speakers. He will have a new SOTA pair by the end of next week. Still no pics of any of this gear...
@dasign @dracule1

The linearity test plot shown are frequency responses taken at two different SPL levels and then subtracted from each other. A speaker that has no compression will be flat across the full range of frequencies demonstrating 0 dB difference at low SPL compared to higher SPL. Only a speaker that compresses will show deviation from 0dB. Soundstage make these measurements in a government funded research laboratory. These measurements have everything to do with compression (loss of dynamics at higher SPL). 3 dB of compression is quite audible it would be similar to a tone control on the treble down by half. One can be reasonably confident that at over 100 dB SPL the compression would be 6 dB or more across the treble. Compression doesn’t suddenly get better at higher SPL - it usually gets worse. The heat in the tweeter voice coil driver will increase the impedance and this makes the passive crossover design incorrect at high dynamic SPL levels.

This is a real design problem in speaker designs intended to play as loud as live music. It isn’t a problem for designs intended to play at low or moderately loud SPL.
@lhasaguy    

 No surprise that the C2600 will need a bit of tube rolling to sound its very best. That said, out of the box it is very pleasant sounding. I have no qualms recommending it. The phono stages are absolutely first class and the line stage with the right tube to taste can be sublime. I use NOS telefunken in the phono stages and a single NOS RCA long black plate in the line stage - the output line stage output is stock.

I too thought that I would need the C1100 to get the kind of quality I desire but so far I am happy with the modest c26000
@whitecamaross

Nearly opposite of my findings with C2600. The DAC in the C2600 is of little interest and rather ho-hum. The treble is a bit too forward. Bass is not tight at all - fairly middle of the road compared to SS - but fortunately it isn’t overly lush or warm like most tube amps.

Of course, this demonstrates that you can’t learn much in a few days about the capabilities of a tube preamp. You need to spend some serious time tube rolling and what I describe is possibly entirely different because I have different tubes.

Judging by your comments, I could achieve closer to the sound that you describe with NOS Mullard (Dullard) tubes. However, if you have stock tubes then I wonder if your C2600 is in need of repair? Your description is really that far off!

@techno_dude 

Any preamp that needs +5 or +7 on the treble has got to be in serious need of repair or is very poorly matched with the power amp.
@whitecamaross 

C47 that Techno refers to is not a C2600. If you have never rolled tubes then I understand why you could possibly think a tube amp out of the box can be categorized by its performance with its stock tubes.