whats a strong 4 15's setup

Im looking into doing 4 15's my next system power can be from 4k to 12k I just want it to out perform my 2 18 xl's on a ia 40.1 at .5 in an 03 tahoe subs facing up port back
Spl numbers ... or maybe pics of your old system to know what to go by ...

Got enough battery / electrical for 2 40.1s ??

hard to answer that question without knowing what your current setup is doing?
exactly ...

 
I don't understand the trouble..

the Bls will smoke them..

you might have put up 153 on a good day with the 4 15s you will put up a 155 on a bad day..

who cares what he was hitting..

properly designing the box for the 15s is the focus here..

4 9515s will require too much power and moving to xl 15s still gonna require too much power..

the key to getting loud is efficiency matching cabin gain and getting power to the woofers efficiently.

buying 4 very high power subs will simply require more power a huge box and a **** load mire port area..

kiss...

 
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