IF you really want to duplicate Zep level SPL then you need pro sound reinforcement drivers and mid / HF horns. You could look to the Dead and wall of sound and build it modular. I advise JBL pro level drivers. Budget for hearing aids.
which speaker to buy
my son has a mcintosh 7300 and 2002 which he want's bridge so he will have 600 watts per chanell. he likes his music loud. he likes hard rock music. what speaker should he have??? i told him that here on audiogon forum many like the klipsh speakers, old or new.