Wattage? As in 15 watts, 50 watts, etc? No. That's just if your running full range speakers off the HU amps, which you shoudn't do, get a stereo or 4 channel amp to power them. Preamp volts out, yes, but only as long as they are above the minimum input limits of your amp, which they usually are. Usually 1.5 -2 volts is enough.