Lamm LL2 w/ Pass labs

well, that got alot of my questions answered...Again any users with Lamm LL2 and Pass

My suggestion would be to ask Kent English of Pass Labs.
(service@passlabs.com).

Perhaps include the impedance specs of the LL2 preamp that were published in the Stereophile review I linked to above.

Good luck.

Lamm LL2 (NOS Mullard Tubes) with Pass Aleph 0 is a impressive match. Not dull, not dark, not slow, not colored.
One of the best - true sounding - combinations ever listened to.

I've owned the LL2 and the XA.5, not the X.5 and based on my listening to Pass Amps, I would think the would match well in terms of sound because the LL2 would add just a touch of midrange warmth and bloom that would beneift the X.5 series. It might or might not be too much of a good thing with the XA.5, though I suspect I would like it. If I'm reading the specs right the 250 ohm "corrected" output impedance should be fine with the 20kohm input impedance of the X.5s.

At the risk of beating this dead horse, my concern about output impedance was due to Stereophile test measurements which I linked to above. John Aktinson observed:

"The LL2's output impedance was a low 245 ohms in the midrange and treble, this rising to 3.3k ohms at 20Hz."

The rise to 3.3k ohms at 20Hz is the problem area that could cause bass roll-off if used with low input impedance amps.

Atkinson continued to say:

"Provided it is used into high-impedance loads, the Lamm LL2 offers enormous dynamic range. "

So, I just wanted to offer some data for my statements. The LL2 Deluxe might sound exceptional with the Pass Labs, but I would only buy a used LL2 to test the theory. I'd hate to buy a new one only to find it didn't match well, and then lose my shirt upon resale.