I've had a lot of pioneer head units, deh-p7800mp and 9400 right now and deh-p680mp premier before these, point is, in the audio settings, there is "Sub1", "Sub2" Subwoofer 1 is phase control and sub on, off control, sub 2 is the sub crossover settings and sub level. I'm not positive because I've never owned a pioneer in dash video, but I've messed with them in stores, but turn on the crossover and choose a cut off frequency, then choose how many db to boost the sub level. There is also a bass boost option but it will boost the bass to your components also so make sure you set your high pass frequency cut off also. Also, there is a SLA option, "source level adjustment", tuner, cd, iPod, Bluetooth. Sound retriever is for poor quality down loads but careful, you could send a clipped signal and fry some speakers with that. The 13 band eq that receiver comes with gives you a lot of adjustment. It's easiest to try " super bass" or
"Powerful" in the preset eq provided by pioneer and adjust each frequency from there. It will stay in "custom 1" until you change it.
Sorry so long winded but it takes some experimenting to get it to sound how you like it with pioneer. Once you figure it out, you'll probably love it.