Preamp output voltage?


Could someone please explain preamp output voltage? What effect (if any) does it have on amplifier performance, S/N ratio, dynamic range, and most importantly, subjective listening? I have an old Adcom GTP-500II tuner-preamp with a rated output of 2.0V RMS and a peak output of 10.0V RMS. I am considering replacing the Adcom with a new AV surround receiver, and I would use the pre-outs to power my front KEF 104.2's with an Adcom GFA-555II amp. I am looking at the Outlaw 1070 receiver, but it only has a pre-out voltage of 0.76V. The Yamaha RX-V657 receiver claims a pre-out voltage of 2V. Will either of these receivers (or any other receiver) be likely to sound as good, driving the Adcom amp, as the Adcom tuner-preamp for 2 channel music?
javachip

Showing 3 responses by javachip

Thanks for the helpful feedback! Yes, I do fret over minutiae before buying something new. Isn't that part of being an audio nut? :)

With the Adcom GTP-500II preamp, the volume knob travels from about 7 o'clock (zero volume) to 5 o'clock (max). Using my Adcom GFA-555II amp, usual listening level is about 9:30 or 10:00, 12:00 is uncomfortably loud, and the drivers on the KEF 104.2's are destroyed by 1:30. (That experiment was performed twice.) So based on the comments received here, perhaps a preamp with a lower output voltage would allow the volume knob to be safely turned up closer to 12:00.

Can anyone recommend any other surround receivers in the $600-$1200 range that might sound especially good as a pre-pro with the Adcom GFA-555II? I would like all of the current surround modes, but I don't need phono or video switching.

Here is a link to the review reporting the 0.76V pre-out voltage for the Outlaw 1070 receiver: http://www.hometheaterhifi.com/volume_12_3/outlaw-1070-receiver-9-2005-part-1.html
I am not familiar with the Denon 3300 but I assume it does not have all of the current surround modes including ProLogic IIx etc... I would prefer to get as many of the currently available surround modes as possible. I almost bought the Denon 3805 but the weird remote was a deal-breaker. The other thing is that, darn it, I want gold-plated (or at least gold-colored) RCA connectors!

I just learned about the new Emotiva Ultralite pre/pro and 6/7 channel amp units that are supposed to start shipping next week. The specs and prices look very interesting, so for now the Outlaw is on the back burner until I see some reviews of the Emotiva.
P.S. -- Thanks to all for the feedback on pre-out voltage. I am seeing numerous comments in the Outlaw forums about how the 1070 needs to have its volume knob and/or channel trim controls turned up higher than usual to get a decent volume. This would seem to be consistent with the fairly low reported pre-out voltage.