Which pre/pros have high output?

not sure what you mean? can you provide a little more info?

John:

Let's reframe the discussion just a bit. The so-called "volume knob" does not actually increase the volume -- it actually turns it down. At full rotation (maximum volume), the volume knob is simply passing along the signal as it enters the pre/pro from the source. Most preamps seem to be at "full gain" at roughly 12:00 on the dial, which means that the rest of the gain setting is largely irrelevant. It is actually better when the volume pot must be turned up to around 3:00 to yield the maximum volume setting, since this range gives you a wider, more discrete range in which to adjust the volume. It sounds like your NAD is simply set to use more of the rotation range of the "volume" knob.

In all likelyhood, you are approaching unity gain with your preamp volume at 2 or 3 o'clock. This is a good thing. Try a preamp with too much gain and you'll hate it. Volume is too touchy for subtle adjustments.
As long as you can always get to a point that is loud enough, leave well enough alone.

Got it! Thanks everyone. Much appreciated!

Sdcampbell notes that most volume controls don't seem to do much for the last 1/2 turn or so. I too have noticed this. I think that the reason is that pots are being made with "linear" taper and with "log" taper, but the "audio" taper that we used to use seems to be unavailable. Sometimes, back in the old days when audiophiles built their equipment, if we couldn't find an audio taper pot we would use a log taper, but we always considered this to be a less-than-satisfactory substitution. In these days of multikilobuck preamps you'd think they could get this right.