ATI SIGNATURE SERIES 6005 OR CLASSE CT 5300??


Good afternoon all,
i am currently in the market for a 5 channel power amplifier. i just recently sold my classe audio ca 5200 and i truthfully LOVED IT. It has been THE BEST multichannel power amplifier i have owned PERIOD. I loved the smoothness and soundstage. i felt it had a taste of 'tube like sound' if you will. That being said, my plan was simply to move up to the ct 5300 which has more power and some say it has better bass control than the ca5200 which was one of the things it was criticized for. however, i started to read reviews on the new ATI SIGNATURE 6005 and its amazing noise floor etc and of course every magazine is raving about it. Having owned outlaw audio amplifiers before which are built by ATI as well, i am wondering if the signature series is just a little better than the regular at series ? they seem to be a little on the forward side, but i have spoken to several dealers who claim the signature series is neutral, not forward and that it is a spectacular upgrade over their regular series. However, i don't really see anyone else who has given it their own review and comparing against their former amplifier. yes, there is a reviewer who said it was just as good if not better than his parasound a51.
My current set up is martin logan montis, motif x, and i will eventually get the martin logan EFX surrounds. AS far as a processor, i am only using the ps audio dac as a preamplifier because i am waiting on the marantz 8802 to release in february. i would say i am about 60% music, 40% movies.
Given my situation, what would you guys get? i would love to know anyone's input.
jays_audio_lab
Whitecamaross,

Your source may be mistaken. There is no 7 channel ML amp. The 7 channel amp from Harman is the Lexicon amp. It is probably true that most ML amps are also made by ATI, but this is not one of them. I assume they all use the same technology.
The five channel mark levinson is the same thing as the 6005 signature series and not their 3005 series. Next week I will let everyone know how good or bad this amp is. I also got feedback stating they the ati 6005 destroyed the parasound halo a51. It killed it in power and detail plus soundstage. It wasn't even close according to my source.
I am fairly certain the ATI will not disappoint. It is certain that the ATI is designed and built by ATI in their factory. Not clear where the Lexicon is made, though that is not critical.

I agree on soundstage; the 3002 which I have does an excellent job. I think this due to the power reserves and the flatness of the amplifier phase across the audio spectrum. I think these two attributes help 'lock-down' the soundstage - for example as a piano goes through its range (amplitude and frequency) a flat phase response will help keep it localized rather than start to float around. My opinion.

Not too many manufacturers I have looked at publish their phase response - I have seen ATI, McIntosh and Hypex NCore publish theirs; I am sure others do.
i am definitely looking forward to this amp. i will do a lot of 2 channel listening as well and since i own the pass labs xa30.8, i will be able to compare and see just how good or bad this 5 channel amp is. I will be using a ps audio DAC as a preamplifier for my 2 channel listening session and then i will be able to choose a processor based on how neutral, bright, or warm sounding i find the 6005.
Ok guys,
I finally have had the opportunity to connect the ATI 6005 signature series and spent a few days with it. Before i give MY PERSONAL opinion, let me discuss what other amplifiers i have owned:

NAD M25
BRYSTON 9BST
BRYSTON 4BSST2
KRELL CHORUS 5200
CARY AUDIO CINEMA 7
CLASSE AUDIO 5200
CLASSE AUDIO 2200
PASS LABS XA 30.8
LEXICON RX7
ROTEL RMB 1095
PARASOUND HALO A21
MCINTOSH MC205
KRELL TAS
KRELL KAV 500
ANTHEM P5
ANTHEM MCA 50
and a few other amps that i am sure i can't remember right now.
I had a full 5.1 set up but downgraded to a 2 channel set up. What i currently own is the martin logan montis, PS AUDIO MK2 DAC and a macbook pro which is connected via usb to the ps audio mk2 dac. For my listening experience i used spotify and also tested a few bluray players in 2 channel mode via the oppo 103d connected via coaxial to the DAC.

With that said, i have done about 5 days of listening with all sorts of music and also a few movies. I typically use the same music that i have used in the rest of the amplifiers that i have owned so i am pretty well aware of what changes the music suffers as i try different amplifiers.
I will say the ATI signature series is a VERY WELL BUILT unit. Nothing and i mean NOTHING was forgotten on this unit and one interesting thing i noticed is that it ran relatively cool even at ear splitting volume levels.
Now, for comparison purposes, i used the pass labs xo30.8 and the classe audio 5200. Here is what i found:

PROS:

1. The amp is very neutral. It seems as if EVERYTHING is "flat". The bass is strong, but NOT BOOMY or exaggerated. As you crank it up, it keeps hammering WITHOUT starting to take over. It really sounds tight without being over emphasized.
2. The high frequencies are on point and really crisp, but NOT LAID back or forward.
3. The midrange is really articulate and has enough "body" to let you hear what is being said.
4. When cranked up at over 100 db, i found it very VERY powerful and with a nice soundstage. You don't feel as if you want more of anything. It feels like it is just right. Nothing really jumps at you.
5. Lastly, the amplifier does give you the feeling that you are hearing what you're feeding it. It doesn't color the sound so IT WILL NOT forgive you if you through a crappy signal or source. It will let you hear it. You WILL hear things in your music that you didn't know were there before. I heard ambulances in the background of some songs i had no remote idea were there.

CONS:

1. Because i was comparing to the pass labs and classe, i did find the ATI more "forward" and perhaps LESS tolerable at loud volume levels.
2. If you are "all about that bass" then i will say this amp might not be as "forward" in the bass department as perhaps the pass labs xa30.8. The pass labs actually had more low end oomph at low to moderate levels than the ATI.
3. If you are the type that likes to listen to your music at a low volume setting and expect to hear all the fine details of your source while not losing some low end frequency, this amp Will disappoint you. I listened to several songs and found the pass labs just MUCH MORE detailed at low volume levels. It feels as if the ati demands that you crank it up in order to hear what it can do.
4. If you crank the classe 5200 or the ATI as loud as you can handle it, the ati will give you a much tighter bass response BUT the high frequencies are sharper which in turn might make you want to turn the volume down. This is NOT the case with the classe. I can crank it up and i can tolerate the music relatively loud without cringing because the high frequencies are rolled up somewhat.
5. If you like a sweet sounding, warm music, this is not the amplifier for you. What does this mean? well, if you like pass labs, mcintosh, or classe then this amp might not be your cup of tea.

Overall, i do feel the amp is a big bang for the money. It doesn't really take away anything from you ,but rather give you more detail that you didn't know was there before. however, MY TASTE remains with classe audio for a multichannel amplifier and pass labs for a 2 channel set up. i have owned over 30 amplifiers in the past 12 months and NOTHING has impressed me more than the classe or the pass labs. Keep in mind, that i am a fan of music that sounds pleasant if i decide to blast it from time to time and typically warm or sweet sounding amplifiers are the ones that tend to reward with these qualities. I get ear fatigue quite easily and i have yet to find a better, or more comfortable amplifier to listen to at BOTH, low or high volume levels than the pass labs or classe audio.
In conclusion, after finalizing my review, i placed an order for the Classe CT 5300 power amplifier (i sold the ca 5200) and have decided that the ATI 6005 will need a new home. If you are interested in it, i can give you a very good deal so let me know :)