would this sound good?

well with my old system i would turn everything down on the amp and i woudl turn the head unit up to were my doors and 6x9's would sound the best then id go back and mess with the amp intell i got the subs sounding the best at that volume

That seems like the way most folks do it. Your on the right track.

I would still suggest looking up how to do it on the forum. Click the search button and type in "Setting Gain". Although you're on the right track, that's not really the correct way to do it. Also, that box you have may not work for all subs. Each sub is different and requires a different box. Is it sealed or ported? And do you know the internal volume of your box? Lastly, if you want your system to THUMP, I might suggest looking into the Kicker Comp VR line. They're cheap, handle 400 rms each, and given the right box and power, will definitely thump.

Hey, its definatly a good thing you have it wired and everything already if you are on a budget. having a box already too helps. what is the internal volume of the box, is it sealed or ported?99 Blazer LT.   Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)

well the volume of the box is 1.83 cubic ft and i got the box from my uncle and when i got it it looked like it was ported then sealed then ported again but then i sealed it bc i thought it sounded a little better 

and the pioneers are 400 rms so i figured that was pretty good but if u guys have any other subwoofer sugestions im open to them