i got my amp all hooked up, power light turns on, subs are wired in, buuut when i turn on music i get no boom.. music plays, settings on headunit for subs are on. and idk what the eff is goin on

thanks for help
amp: SPL GRLA-2000/1D
subs: 2 kicker 12" dvc 4-ohm cvrs
headunit: pioneer deh-p6000ub