Rear deck mid bass options
 

I have removed my 6x9 infinity reference speakers from my rear deck an now I want to put a little more bass there.Im checking for the elemental design eu 700 wonderwoofer 6.5 for their versatility and im also checkin for the kickers SS 6.5 or 8in.I saw that MB quart made what they call add a woofer system that come with the crossover wich is nice I think.

But now Im undecided,I want to buy my speakers before buying another amp and I want to know what do you guys think about my idea or if you have any suggestion than that, im open to everything.