unable to get you point ,
If you need very boomy bass , u need bigger box
12k to 15k is pretty much , you can get SPL
but which amplifier do u have to run driver
ike 18db se start ho ???
18db ????
normal woofer hits 114 db easily ( DB SPL sound intensity )
normally woofer comes with 88 db and more ( that is woofer sensitivity)
Mostly amplifier comes with 0 to 12 DB bass boost , more good amplifier 0 to 18 db , extra ordinary great 0 to 24 DB
bass boost
Which DB are you taking about ??