armykyle1 Posted September 4, 2012 Report Posted September 4, 2012 So I've decided that I don't like this 38-39hz tune at all. We have 9.5 cubes (after disp) current port is a 12.5 sonotube @14.5" long I can maybe stretch it 17" maybe, but all that extra port will be external. But that's only 36-37hz 12" doesn't help much either... If I can find a 11.5" sonotube I can get to 34hz @17" long 12.5"=122.6sqin of port=12.9sqin per cube 11.5"=103.8sqin of port=10.9sqin per cube Most people's rule of thumb for round to slot port is 3-4" so 12.9sqin per cube =15-16.9sqin per cube 10.9=13-14.9 So what do you ladies think? I think the 11.5" should be enough still. TEAM XS POWERTEAM HEAVY HERTZMy build- http://www.stevemeadedesigns.com/board/topic/194454-e46-bmw-build-pos/#entry2914134youtube- http://www.youtube.com/user/armykyle1big build starting
armykyle1 Posted September 4, 2012 Author Report Posted September 4, 2012 Also the subs are my ufo BTL's with sundown parts. TEAM XS POWERTEAM HEAVY HERTZMy build- http://www.stevemeadedesigns.com/board/topic/194454-e46-bmw-build-pos/#entry2914134youtube- http://www.youtube.com/user/armykyle1big build starting
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