my set up
rockford p550.2 (550w bridged apparently)
alpine type r swr-1222d
pioneer 1300mp head unit
the sub is bridged (everything is wired correctly)
to get to optimum bass i have to have the amp gain set to about 70%
(HU settings bass+1, treb+0, fad 0, sla+0) loudness off
it will sound...