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Difference between Pass Labs XA160.5 an X600.5?

Hi all,

I currently own a set of Parasound JC-1's to drive Dynaudio Confidence C4's. Although they match very well, I currently look for ´the next step`. Based on several reviews I read, Pass Labs seems to be a very good substitute for the JC-1's. I doubt however if the XA160.5 are powerfull enough. Why? Today I integrated my Velodyne DD-18 with the C4's and I heard the soundstage changing when I but my Velodyne DD-18 subwoofer on/off (at a crossover frequency of 50Hz). Apparently my 800W RMS JC-1 (into 4 Ohm) can't drive the C4's full range?!? The price difference between the XA160.5/XA200.5 and X600.5/X1000.5 is however significantly (i.e the price of a XP-20 I intend to buy). X600.5 is class A upto 80W (so seems are safer alternative than the XA160.5).

I will try to listen to both amplifiers on short time notice here in the Netherlands, but has anyone already heard both these amps and if so, what are the difference?

Thanks!
jean_sibelius
petrushka1975
19 posts
 
It comes down to personal preferences. Some people swear by the dark, liquid, and velvety sound of pure class A, while others prefer more neutrality, speed and dynamics. The question isn't whether the XA200.5 is sufficiently powerful, it's that it sounds fundamentally different in character from a class AB design. Some people, myself included, actually prefer the latter, as do the many people who buy state of the art class AB designs from ARC, MBL, D'Agostino, etc

If your X600.5s were exhibiting glassiness, it was probably caused by component matching, AC quality or cabling.
garygallegospe's avatar
garygallegospe
6 posts
 
I will soon have a pair of Pass labs Xa-200.5 to a/b against a New pair of Pass labs X1000.5 I will Post some thoughts Soon. Thanks for the replies.
Gary G.
peterayer
1,382 posts
 
Gary, That will be a most interesting comparison and I look forward to your report. May I ask what is in the rest of the system?
garygallegospe's avatar
garygallegospe
6 posts
 
I found the Pass Labs XA200.5 amps to be more Musical. I would say the 200 watts of class A sound make a huge impression. With the X1000.5 there was more Bass control.
rtn1
535 posts
 
Gary,

I found that the X.5 really benefited from an extended warm-up time. It took at least 8 hours for it to become musical and listenable for me. At 12+ hours, it was even better. During the winter, I would leave them on 24/7, and they sounded good. During the summer, forget it. However, the XA.5 sounds better cold than the X.5 after 24 hours.

For the XA.5, I think there is some small improvement after 2-3 hours. There may be additional subtle improvements after 8-12 hours, but these are quite minor. If someone was coming over for a listen, I'd leave the amps on overnight to get the best sound, to be sure.

For bass control, I think this can be optimized by component and cable matching. But the X.5 would probably have more "fast" bass.
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