i have an eclipse titanium 15 on 1200 rms for the single sub im trying to get anouther and over double the power thats my advice dont go with the cheaper subs they have the titaniums are awsome
Eclipse Ti's have great sound quality. Eclipse makes great products. They push hard (spl) but are more along the lines of (sq) or SPL 50/50 there more for sound quality then hitting hard. Thats for the eclipse ti's I know nothing about any of there other subs or products. Any audio pro will tell you they are decent. Remember theres always somthing better but along the lines of gettin the job done i'll rate them high.
as far as sql subs i rate very high a buddy had a 13w7 on a jl 1000.1 and the jl was a slight bit more clear and about the same loudness but the eclipse will handle easy anouther 600 rms that i dont have on it
dont go with the cheaper subs they have the titaniums are awsome