posted
Hey guys, i have a quick question, i have a suzuki Swift 2009, iīm building for AD NW with a single DD 3518 18" and 5000 RMS,i built the box 4 c/f after displacement and 2 8" external ports, they are 17" long each one, the box itīs on the back seat area, well, i tried cutting down the ports and the number went down, i got them longer and it went down, i shrink down the box with some woods and the number went down, funny thing itīs that the peak never changed (57 hz), i thought that my carīs frequency would be higher with the box so close to the windshield, this means that my box is too small and the ports are too short???
Said that, i took a sealed box, ran a sweep and the peak was 48 hz WTF???? so, is this normal??? if the box is closer to the sensor the FR itīs lower??? i need some help here, i couldnīt get more than 148.4 dbs :S:S:S:S
Posts: 20 | From: Panama | Registered: Aug 2009
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posted
try less port area. that might show a little more which way to go
Posts: 5494 | From: Columbus, OH - formerly FL | Registered: Oct 2003
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posted
a single 8" maybe??? i wish i could get a single 10" but i couldnīt find 10" PVC to test, maybe an 8" and a 6"? hahaha.
Posts: 20 | From: Panama | Registered: Aug 2009
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posted
single 8".... freq is ok....what have you espect? not every car is panda :lol: there are lot of things that influence on res. freq...shape of the car....car interior..etc...
-------------------- 2xAlpine type R 12"&Gz amp=151,1dB - no panda..just a normal car.... 2xAlpine subs+1950wrms=148,3dB - ported by LB audio Posts: 81 | From: Croatia | Registered: Jul 2009
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posted
i would have expected the vehicles resonance to be between 48-51Hz
Posts: 5494 | From: Columbus, OH - formerly FL | Registered: Oct 2003
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When doing the sealed box test, did you have any bass boost on your headunit or crossover? This makes a difference
Posts: 77 | From: Miami | Registered: Jul 2008
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