Passive Preamp - What makes it work?


I want to try a passive preamp, such as Creek's OBH 12, as an inexpensive pre to replace my current Denon AVR1700. I've read a bunch on here that output levels from the CD and input impedance of the amp are crucial factors. What should I be looking for to see if this is a good idea for my system? Is the goal to make the impedances match, or should one be higher than the other? Also, are there any passive pre's with a home theater passthru?

My system:
Joseph Audio RM22si signatures (86 db sensitivity)
McIntosh MC-2105 amp (input impedance 200k)
Music Hall CD25

Thanks
matt8268

Showing 1 response by albertporter

Theresa, there are (as always) several views on this subject.

Some say that passive preamps are superior and follow the "less is better" rule. A passive preamp can only cut signal. It cannot increase signal if needed, nor can it actively impedance match between multiple components.

Others believe active preamps are better because they can more effectively manage all types of signals. Active preamp's have many more parts, require power and process the signals fed into it, often adding their own personality (for better or worse).

Some Audiogon members go the no preamp route. Instead they choose a CD player with a volume control and drive direct into the amp.

All three answers are correct provided you have the right combination of equipment.