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Message: <blockquote data-quote="lionel2" data-source="post: 1631574" data-attributes="member: 566416"><p>Hey my subs are now happy..i got rid of my sealed box and now running a ported box for my 3 12's..I have the old school JL 12w6's..they are 300w rms and 600w max...my ported box is about 6.5 cubic feet with 2 slot ports on bottom..firing toward the back of my SUV..with subs facing up...i had an estimate of how many DB's it could do..and man that did my install said 140's for sure..so i came in the following week to get it metered and he was right..it was in the 140's...not sure what mic...any questions or comments please reply....is it normal to have such a big jump in dbs for just a box change???..thats why i wrote this thread...just curious..thanks</p></blockquote><p></p>

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