My preamp puts out 0.7v into a 3.5 watt SET with an input sensitivity of 500mV. With my speakers I can drive everything really loud without any sound degradation so that's not the issue. My question is this: I'm looking at another power amp which is rated at 8 watts but with an input sensitivity of 800mV... Will the outcome be similar? How does the whole sensitivity/watts equation work? Currently (see what I did there...) I have the preamp's volume at 11/12 o'clock for ideal listening levels. What will happen with the 800mV/8 watt amp? Thanks for your help!