Hey Glasswolf, this is danstan, i originally had two 401 rockford amps(each 400+ rms) wired each to 10" solobaric L5's(2 total). Each amp powered its own sub. Well, if you remember i had tensil lead problems with the l5's so i switched to the 10" L7's as you recommended. This is weird, when i use one bass boost up and one down(and vice versa, the one sub that is boosted is loud. When i have both bass boosts up they are very quiet, lower than the one sub on. Basically, when i use one sub it is dramatically louder than the two subs. Pleaz help~!