impedence value.? amp to preamp.

if your amp has 15kohm input impedance and your preamp has 20kohm input impedance is this a unworkable combo?

energizer05-04-2009 7:06pm

sidssp Details Discussions Posts This discussion Message User 1,077 posts 05-04-2009 at 07:43pm Copy Comment URL Report Comment Edit Delete What you need to look at is the input impedance (the higher the better) of the power amp and the OUTPUT (not input) impedance (the lower the better) of the preamp. The common consent is at least 10 to 1 ratio, i.e. you need the input impedance of an amp to be at least 10 times higher than the output impedance of a preamp.
sidssp Details Discussions Posts This discussion Message User 1,077 posts 05-05-2009 at 07:37pm Copy Comment URL Report Comment Edit Delete The concern of resistor based attenuator is that the output impedance changes a lot depending on the setting. That means when matched with a low input impedance amp, your system may sound very different as you turns the volume up and down.