rambronco Posted January 28, 2014 Report Share Posted January 28, 2014 Hey guys, not looking for specific numbers, just curious as a general rule would you determine port area for a 4th order BP using the entire combination of both chambers or just the ported side? Thanks for your input. RB 01 Chevy Silverado X-cab 2 Sundown Z18v4 walled on 2 Lanzar Opti 7k's strapped at 1/2ohm = each amp wired to 1/4ohm. Havent checked impedence rise so not sure what they are actually seeing. 6 group 31AGM's. 2-Eclipse 34230's each one running 2 Eminence 6.5" Beta 6A. These are beastly mids rated at 350w program power. I was skeptical but the eclipse amps are 370w x 2 and when there was 4 mids on 1 amp I could push it into thermal protect within a song so added the 2nd amp. Eclipse 4212 running 4 CT sounds Meso tweeters. and 2 DLS ultimate tweeters up high to raise the soundstage. 96' Ford F350 4wd 4d long bed 7.3 diesel with 91k miles. Will be the sound quality rig if I can ever find the time. Link to comment Share on other sites More sharing options...
Joe X Posted January 28, 2014 Report Share Posted January 28, 2014 Just the ported side. EDIT: the net volume of the ported side will determine the tuning BUT the port area is never determined by chamber volume. You pick port area size to limit the peak airspeed on the port. Link to comment Share on other sites More sharing options...
mrd6 Posted January 28, 2014 Report Share Posted January 28, 2014 Bandpass port area isn't really based on gain chamber size....should be based on tuning, power, and displacement potential My Build Log: http://www.stevemead...-sundown-power/ Team NorthWestSPL Link to comment Share on other sites More sharing options...
Joe X Posted January 28, 2014 Report Share Posted January 28, 2014 And neither is on a ported box. Link to comment Share on other sites More sharing options...
rambronco Posted January 28, 2014 Author Report Share Posted January 28, 2014 But no matter the design there are still some basic fundamentals needed to ensure there is no port noise. So are you saying that you can use Vent Mach by itself on a 4th order?. Just so that there is no confusion I am looking for a good starting point for the vent size, I will be using Win ISD to finish everything off. I realize that any change made to area will affect tuning if nothing is done to length and vise versa. but Im curious if by design a Bandpass needs more or less port area to keep efficiency up and port noise down. Keep em coming guys, I like to hear everybodys opinion and im good at constructive criticism. I will never be to old to learn and this is how I learn much of my stuff. RB 01 Chevy Silverado X-cab 2 Sundown Z18v4 walled on 2 Lanzar Opti 7k's strapped at 1/2ohm = each amp wired to 1/4ohm. Havent checked impedence rise so not sure what they are actually seeing. 6 group 31AGM's. 2-Eclipse 34230's each one running 2 Eminence 6.5" Beta 6A. These are beastly mids rated at 350w program power. I was skeptical but the eclipse amps are 370w x 2 and when there was 4 mids on 1 amp I could push it into thermal protect within a song so added the 2nd amp. Eclipse 4212 running 4 CT sounds Meso tweeters. and 2 DLS ultimate tweeters up high to raise the soundstage. 96' Ford F350 4wd 4d long bed 7.3 diesel with 91k miles. Will be the sound quality rig if I can ever find the time. Link to comment Share on other sites More sharing options...
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