sub setup help.....

[Jumby]

Just got my dayton sub in.... Onkyo tx-sr503 polk r15 front and rear, csi25 center, onkyo has choice of 80 or 100 crossover, all speakers are set to small. sub has two dials, gain - min/max and freq - 40-180. where in the heck and how do I try to dial this thing in? the r15 fronts will be replaced with a pair of r30's in a few days, how will that change setting them up?

[Mr Peabody]

You use the gain to match the sub up with the speakers level. I like to set mine low to leave the sub amp plenty of headroom and adjust the level with the receiver menu. If your sub does not have a bypass switch to bypass the internal crossover I'd recommend setting the sub crossover all the way up as high as it goes and then using the receivers crossover points, the one sounds best with your speakers.