From 15s to 12s

[phresh 0]

Is there a way to find out how much output I will lose if I go from 15" BLs to 12" BLs with the same variables on the same power?

[Bigpimpin91 0]

Quite honestly, no.

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Ok thanks. Thats what I thought. There are too many variables and different things to take into account.

[ABXX49 20]

The only definite thing is that you will lose output. (Assuming same power and ideal boxes.)

[KU40 173]

You can do the cone area theory that says twice the cone area on the same power will yield a 3 db increase. On the site it says the 15" has 810 cm^2 and the 12 has 480 cm^2. That's about 60% of the cone area you had before, so 40% loss x 3 db = about 1.2 db lower. But that's purely theoretical and the way the different size subs interact with the box their in (where the peak is, impedance, etc.) can/will affect that as much as the cone area decrease.