I'm thinking about getting 2 12" idmaxs in a 4-4.5cuft box tuned to 30hz and a sundown 2000d. I currently have 2 alpine type-r's in about 4 cuft @ 37hz on a MA audio hk 401sx. Will I notice much of an improvement? I would think just like 3db gain from doubling power, but the idmaxs are significantly more efficient than the type-r's so maybe more. I am also expecting a bit of sound quality improvement.
I know it is install dependant, but I'm not asking what kind of numbers i will get, just if i will see a decent improvement that will be worth the money spent.
the sound quality should be much better from both sides the idmax sounds great and the sd amp will sound better also. i think you will be very happy with changes.