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
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 once heard the Outlaw's receiver performance. For HT and price it's very descent. However the preamp section is realy weak. Therefore I would suggest looking at the used Rotel HT components.
I ran my Denon avr-3300 with an Adcom GFA-7500 for a couple of years and really enjoyed the combo. I had Energy Veritas at the time...Damn, they could play loud! On the rare occasion I had the Denon wide open and that Adcom just gobbled it up!! I had a Parasound amp until last night that I liked more, not better per say, just different. Hell, make me an offer on my Denon, you just might find you don't have to spend as much as you think you do to get what you want!!
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.