HotRodHam Posted April 22, 2013 Report Share Posted April 22, 2013 with a 4th order, the ported area needs to be tuned at like 45-50 am I right? or is it even higher. First time messing with 4th orders and I want to get it sounding good. 2 10" Alpine Type-Rs. sealed section is 1.1 after displacement. If you have any pointers lemme know. 18" Sundown Zv4 D2JL 1000/1 V1XS Power D3200 Link to comment Share on other sites More sharing options...
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