I currently own 2 13kv.2's. All is fine and dandy except I'm looking for more power. If upgrading to Diamond D3 subs..will that make a significant upgrade choice? I'm stuck with a mounting depth of 6 inches or less. Oh and the amp is a Nine.1 amp.

Also if anyone can shoot out recommendations off the top of their head for subs that have low mounting depths..that would be great..

 

you could try 3 10s that would be significant increase in spl