Passive preamps and poweramp's input impeadance

There you have it! Newbee has given us some insight on how the impedance curve behaves. Sounds like what we said is right afterall. You'll have to experiment with this one! Arthur

I will third Symphony and Unsound. 10k into 23k is not too good. HOWEVER, it is not the numbers that need to be matched but the impedance curves. I am not familiar enough to know how linear amps' impedances change with frequency to give you many details but if you can find the curves for your two pieces, all you have to do is superimpose them on each other and make sure that they don't hit (the axes will have to be similar of course). Theoretically you could have the preamp's lowest Z equal to the amps highest and still be ok if they don't hit (i.e., are offset). Otherwise the signal will be reduced audibly. So, Pass is right in some situations but if you change the amps or preamps, all bets may be off. Good luck on this tough one. You may just have to experiment and see what you think with your ears since that is what counts in the end anyway. Arthur