Atma-Sphere Class D… Amazing

I have Atma-Sphere Class D and suspect it outperforms every other brand in its price category.

I can’t recall if Ralph mentioned anything about break in time, but he did say they have virtually no warm-up time to achieve best performance. I never noticed anything to contradict Ralph’s statement. Idle current is so low that it invites leaving them on 24/7 yet if the amps happen to be cold, they need little to no warm-up to sing.

A friend of mine is interested in an A-S class D integrated. He mentioned having read that Ralph’s Class D "sound like a tube amp" in only the best way. I have heard various models of Ralph’s OTL and a lot of great brands of tube amps.

I agree with Ralph and others who say his Class D sounds like the M-60 OTL above the bass range, which by any metric is a long-time tube amp gem (having won more awards than maybe any other current production amp.) It seems important to add this caveat: the ideal OTL load is between about 12 and 16-ohm with benign phase angle, which is rare, plus higher than average sensitivity. Class D has no such current limitations and can drive loads below 4-ohm which is verboten for OTL and a ratio of transformer-coupled tube amps.

OTL have a unique signature in the bass range, not necessarily worse or better than SS, just different, hence the qualification "above the bass." In the range of bass instrument fundamental tones, Ralph’s Class D sounds like a good typical class D amp: quick, neutral, superb and powerful. Of course, bass harmonics extend well into the midrange and treble where the Class D is very transparent in this category.

AFAIK for all Ralph’s prior amps, Ralph included a U-shaped copper shorting pin. Using the RCA input required users to short XLR pins 1 and 3 (1 is neutral/shield, 2 is positive signal, 3 is inverted signal; 3 shorts to ground to shunt the entire inverted section of the balanced input to minimize potential noise.) The RCA input of current production A-S Class D requires NO XLR shorting pin, hence none is included. Ralph said shorting XLR pins 1 and 3 has no effect on noise while using the RCA input.

Class D is clean. Seems like they just added some distortion and charge $5.4K for it. DIY NC400 Monoblocks will outperform these as a fraction of the cost.

Spkrplus, I believe they outperform the M-60. I’ve had s-30, M-60 and my MA-1.  I am not sure I’d say they are Tube like. But they aren’t harsh and bright like many SS Amps.  
 

Elangley01, No the just didn’t add some distortion and create some amps. This is a complete departure as to the way all other Class D Amps have been designed in the past.  Hence how Atma-Sphere got a new Patent in the Circuit Design. I doubt the NC400 would be close to having the sonic character as these do. I’ve listened to many high end Class D. Some costing more. And these are better defiantly better. On Monday I’ll have another more expensive Class D to run side by side in my system. Just to see how much bettter the Atma-Sphere really is. 
 

As far as “Break-in” Ralph said not a lot just a day or two. They share same components like Power Supply, Capacitors and such. Which pretty mush all need some “Break in” time. I’ve always trusted Ralph and his staff to give Honest and Straight answers. I hadn’t heard the finished product. But I know Ralph very proud of this product. As he should be. And he is the Designer. So I thought there maybe some Bias. But I think he down played these to me. These are truely an awesome amplifier.  Are they as good as my MA-1’s? In some ways yes. And others ways no. Will I like them better than my MA-1. Probably not. But the MA-1’s are Basically 4 times the cost,also. And they are simply a special amplifier. IMHO…  I’ll reserve comments on that for down the road while I get to compare them more. Need to get used to the Class D some. But there is no heat from the Class D. My house is super insulated. So the MA-1 do heat the room some after awhile. The tubes don’t run super hot because they aren’t driven hard. And they last forever it seems. But they do warm the room up. Hence why I got these. 

Sorry for the Typos and such. Doing this on my phone. Wished they let you edit your posts on here still. When I go to Edit to fix the Typos it won’t let me. Just flicks and goes back to normal. 

Do you guys know what the input gain is on these amps ?