You could place an in-line attenuator between your pre-amp and amp. Rothwell sells a 10 db attenuator that would allow you more useful range from your volume control knob.
Disclaimer: I have never used an in-line attenuator, so I do not know anything about the sonic signature (if any) of such a device.
Enjoy,
TIC
Disclaimer: I have never used an in-line attenuator, so I do not know anything about the sonic signature (if any) of such a device.
Enjoy,
TIC