Confession of a poor power cord pairing for a Pass Labs XA-25


I recently purchased a Pass XA-25 to replace my Nuforce STA-200. I had replaced the power cord on my Nuforce with an entry level Silnote power cord which made a tremendous difference in sound for the Nuforce. However, when I received my XA-25, I apparently was in an extreme hurry and did not install the cord that Pass Labs included.
This evening as I was sorting through a big box of interconnects and power cords, I discovered a power cord that still had its factory twisty tie intact. After a few minutes of deliberation, I realized that this was the power cord that was included with the XA-25. I hooked it up and wow!.. Detail and Bass that I didn't know this amp was capable of.
Moral of the story.... Just because it's factory power cord.. doesn't mean it can't be good.

128x128coachpoconnor

Showing 2 responses by almarg

@gadios, in response to your three questions:

1) I purchased a new XA-25 from Reno HiFi. Consistent with their outstanding reputation I found them to be a pleasure to deal with.

2) Yes. I don’t think you would be disappointed.

3) My XA-25 replaced a VAC Renaissance 70/70 MkIII tube amplifier, which uses four 300B tubes per channel and provides 70 wpc. I use Daedalus Ulysses speakers, specified as 97.5 db/1 watt/1 meter, 6 ohms, and which have an extremely flat and benign impedance curve. While the two amps sound somewhat different, of course, I found that the Pass comes remarkably close to the VAC with respect to dimensionality, imaging, liquidity, and other traditional fortes of high quality tube amps. It’s a bit less rich sounding than the VAC, but I interpret that as an increase in accuracy and transparency, which is fine as far as I am concerned.

Among the various glowing reviews of the XA-25, the one by Terry London (Audiogon member Teajay) in hometheaterreview.com was particularly consistent with my findings.

I have 94 Eff. rated speakers so the 30 wpc should be okay.

Note that after leaving class A the XA-25 can produce much more power than specified. Stereophile measured 80 and 130 watts into 8 and 4 ohms respectively. The extremely tight distortion tolerances upon which Pass bases the 25 and 50 watt specifications also factor into the difference between the specified power capabilities and Stereophile’s measurements.

My debate is whether to buy a used set of 60.8 monoblocks
or simplify with the Int. option. Cost close to the same either way.

The 60.8 and the Pass integrateds (if those are what "Int." is referring to in your statement) are different animals than the XA-25, of course, and I would not infer much if anything about the sonics of those models from experiences that are reported with the XA-25.

Good luck. Regards,
-- Al
Thanks for sharing this experience, Coach.  I too have an XA-25, which is a wonderful amp as you know.  I've never tried using its stock power cord because it is too short to be suitable for my setup.  Instead I use a 12 foot Signal Cable MagicPower Digital Reference cord, and I've been very pleased with the results.

That cord is nominally intended for use with digital components, but I selected it because (a)I wanted the double shielding it provides, to prevent possible coupling of amplifier-generated noise into my phono stage which is in close proximity to the cord, and (b)the 12 gauge conductors it uses are fine in terms of voltage drop, given the 2 amperes that are drawn by the amp as long as it is not asked to supply so much power that it leaves class A (which means the vast majority of the time in my case).

Enjoy!  Regards,
-- Al