still ain't sure on sub, wanted to find or get box being built so i know how much space i'm dealing with.. i really like the fi especially after i found out they make the ssa subs the fi alpha is basically a blend of dcon and gcon, sortof a dcon with 3" coil even basket is the same but specs are very similar to the gcon for $80 less.. all that said the alpha not as much sub as the fu 750 for exact same price.. since i know i need a box i was trying to get that going but box guy i think quoted me to low and don't wanta do it now..