2. amps-preamps
  3. 1040411985

Output Impedance Preamp-Input Impedance Amp

My VTL preamp has an output impedance of 200 ohms. I'm looking at the Pass X150 power amp with an input impedance of 22k ohms. Will this pair be a good match? Currently I have an Adcom 5500 with a input impedance of 49.9k ohms and everything sounds fine. Driving Infinity Kappa 8.1 speakers with a sensitivity of 89db.
mfb33
7 responses Add your response
kr4ef94
208 posts
 
It's OK.
unsound
7,329 posts
 
O.K., but not ideal.
Post removed 
unsound
7,329 posts
 
Viridian, if the output impedance were lower and the input impedance was higher it would be even better. Mind you that is very possible.
Ag insider logo xs@2x
drubin
3,274 posts
 
The Pass X-150 has an input impedance of 22K in balanced mode only. If you are running singled-ended, it is half that amount. But you are still okay.

As I type this, I am listening to a Pass 150 with a preamp that has an output impedance of 1700 ohms. Sub-optimal on paper, but it is sounding very good.
gs5556
1,234 posts
 
Pass "X" preamps have an output impedance of 200 ohms RCA and 750 ohms XLR, which should answer your question.
unsound
7,329 posts
 
MFB33 and Viridian, I owe you an appology. I realize that in my usuall confused state of mind tht I was thinking of another thread that was considering a system sans preamp (passive) which would have been much more demanding. You should be fine.
Log in to respond
More to discover
80x80
Audio Research REF80S
80x80
Audio Design Associates PTM-3245
80x80
puresound P10