with my rf 400.2 if i have the remote thing that comes with it, and gain on minimum without it plugged in, the amp puts out very little power, like at vol 18 of 26 with EQ Flat, 1.0 volts, had to have the gain at 3/4 close to max to get the birthsheet power and i also had that annoying hiss and engine noise in the speakers that i didnt' like, then i plug in the remote to the amp and wow, big difference, hu amp clipped at volume 11 instead of volume 19 without the remote in, i was like hmm interesting, set amp on hpf, put the punch EQ option on max, turned knob on remote all the way up, i just left the amp on minimum gain cuz it read on the dmm 19.3 volts with a 1 khz tone and that was plenty for my speakers, if i turned it up to it's birthsheet power of 144 watts at 4 ohms so 24 volts... i still got that whine sound in the speakers with music playing, with gain on minimum, clean sound, with that Punch EQ option it makes the treble sound so much better and brighter yet i still get that engine whine noise so im thinkin of a new hu and sheilded rca cables. sick of pioneer hu's and it's whine issues