2. amps-preamps
  3. 1144083624

Anybody ever audition the Pass XA series amps?

I have setup a home audition of pair of Pass Labs XA-100's to drive my MG-20r's midrange and ribbon tweeters in a bi-amped arrangement.

I'm quite excited to hear what they will sound like compared to my Pass Labs X-350.5.

So, here's my question, is their any GON members who have heard the XA amps? If so, what was your opinion of their sonics? If you also are familiar with the sonics of the X-.5 series, how would you describe the difference in the two amps sonic signatures?

Thanks, in advance to anybody who can share.
teajay
pubul57
3,712 posts
 
Hi Honest1. I will not be upgrading from the CAT, I'm looking for a cooler running alternative for the summer months. I recently bought a Pass Aleph J, which I think works quite well with my Merlins - they do not need a lot of power and the do not need a lot of damping for the bass. I am however, wondering if moving to the XA-30.5 would bring any improvement over the J - it might not given that the J is very easy to drive with a tube pre and it has low damping which is a good thing with the Merlins. Has anyone actually auditoned the J and the XA-30/.5? I'm also assuming my Joule 150 MKII will not have a problem with the 15 kohm input impedance of Pass, I know the Joule OTLs have an input impedance of 20 kohms so it would seem this should not be an issue with this tube pre.
dejanm
72 posts
 
Pubul57,

If this can be of any help to you ... I tried Pass Labs X150.5 with my Bent Audio passive TVC. As you know passive TVC's are even more critical to amps input impedance than tube pre-amps. I used RCA (11 KOhms) and XLR (22 KOhms) inputs of Pass Labs X150.5 and couldn't hear any issues on any of these two configurations. It was working just fine in both cases. So I guess you will not have any problems either ...
pubul57
3,712 posts
 
Dejanm thanks for your comments. I called Jud at Joule and he said there would be no problem with the 15Kohm input. In fact the Joule has an internal switch that would bring the output impedance down to 400ohms (from 1200 ohms) - he said that would not be necessary. I called Pass and they said the same thing. I guess some people still think the 10:1 rule for impedance matching is true.
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