Lamm LL2 w/ Pass labs

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

The MC402 has even lower input impedance than the Pass Labs with specs of 10,000 ohms (unbalanced) and 20,000 ohms (balanced), so I would think if the LL2 Deluxe has potential impedance matching issues with Pass Labs, then it would have more significant issues matching with the MC402.