Lamm LL2 w/ Pass labs

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.

A valid concern, I was not aware that the LL2 had such a wide swing in output impedance in the highs.

06-30-08: Pubul57
A valid concern, I was not aware that the LL2 had such a wide swing in output impedance in the highs.

Actually, it's the lows...20Hz (not 20Khz). Hence, the concerns about bass roll-off.

ok..what about the LL2 with a Mac 402