cabin gain =23db

winisd models jBL with 600watts = 125db in 2pi space +23db =147db
ouch is all il say

:-)

also im designing an SPL box for a mate in auckland, im wondering if a 9db peak in ported box response will be okay for it :-P i reckon 6db is quite safe,,the thing is that the excursion is low anyway,so why not go 9db peak.. hahah

mmm low compression also on jBL I really hate car audios lack of numbers/specs it ends up encouraging a zone of ' i did this with this sub so u can do it too with ur different model i think' etc..

:-)
cheers
Mike