ok, first of all, are you buying speakers to entertain your neighbors?

and phalanx, i worked at a rockford shop for years and that amp does not enjoy a 2ohm load...it may run for years, ive seen some troopers but on a whole the amp is rated for maximum performance and sq at 2ohm STEREO or 4ohm MONO, but anyway it should be obnoxiously loud if properly installed (wire gague, ground, woofer mounting, enclosure, etc). look at the model number on your subs, i dont remember the xlc's number, but the last 3 should be 415 or 815..4 ohm 8 ohm...if they are 4 ohm, get new speakers or a new amp...if they are 8 ohm, propperly wired in parallel, then it should be loud enough to permanently damage your hearing...

upping the gains is something that should really only be done if you REALLY know what your doing...to a propperly trained installer it is a tool and volume control device, to a noob it a woofer killer...be careful. start with the gain down ALL the way, turn your deck up to your normal heavy bass listening volume and SLOWLY turn the gain up. turning the gain up has an effect on the volume and the THD (total harmonic distortion). louder=more distorted...
not all distortion is audible, but when it is your KILLING YOUR SPEAKERS! you want to be able to crank it w/o distortion.

and yes, ditch the oem equiptment, cuz your bass can be as loud as you want, a line level conv. will kill whatever sq you could hope to get. and factory speakers??? i would never tell anyone
to keep them...if nothing else, sell the 15's and amp, buy two 12's and get a good CLASS D amp and some subs of higher quality than xlc's and a nice ported box....youll be very happy


ps im from east islip origanally, what part of the island you on?