Amp Input Sensitivity vs Input Impedance

Can anyone explain in a simple way the difference between these two ratings on McIntosh amplifiers?

Tks,
Pete

Input sensitivity is a gain value, how high a input voltage to reach full output value.

Input impedenace value is a specification that tells one how much load the amp 'pulls' from the driving preamp. Old rule of thumb is that input impedenace should be 10X the output impedence of the preamp.

The two specifications are not interelated, but seperate specifications.

Lefty

Thanks Lefty, that was helpful.

However, it's got me thinking (a good thing). If I bi-amp; one amp is 100wc and the other is 200wc (smaller amp to upper drivers and larger amp to lower drivers), both having 2.5 input sensitivity - I wonder if I'd still have a balance problem between the amps because one outputs twice the watts as the other?

Hmmm..

Anyway, tks,
Pete

If it seems out of balance, you can trim the gain on the 2205 with the front panel knobs. They reduce the level of the input.

Murray

Oh, and maybe someone that knows what they're talking about can chime in re: passive bi-amping with a tube amp driving the the top or bottom freqs - I think that this is :nono: with a tube amp but ss ok.

Murray