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  #1  
Old 09-28-2010, 01:00 PM
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Default port/box help

ok so, i want to make a new box but... im running into port problems

max dems are 36/37W 14T 25D

2 12s on 7k

current box is triple baffled 36w 14t 25d port is a 6" slot port 17 1/2 long tuned to 45 IIRC

now my problem is i get port noise and port compression soo new box needs a bigger port BUT i dont want to tune any higher and when the port bends i get loading issues on the sub closer to the port

so, what could i do to tune lower but still have lots of port area and no loading problems?
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Old 09-28-2010, 02:13 PM
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port down the middle
or
have some of the port external
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Old 09-28-2010, 06:03 PM
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middle port.. im likin that idea right now lol
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Old 09-28-2010, 07:25 PM
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whats the sub displacement and bracing u will use?
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Old 09-28-2010, 07:31 PM
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its hard to believe that with ~18sqin/cuft that u have port noise

thats crazy, lol
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Old 09-28-2010, 07:35 PM
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that is really crazy
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Old 09-28-2010, 07:44 PM
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sub displacement is .4 for both IIRC bracing... what ever is needed

i even rounded the the port over pretty good to get rid of port noise...

i have gains set for vol 52 and at about 48 you can hear port noise and then port compression at 52

it gets kinda annoying lol
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Old 09-28-2010, 07:54 PM
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have u tried pluggin it to both reduce port area and lower tuning

like with a towel wrapped in packing tape.... i know ur port does not bend so give it a try and see what happens

maybe u have too much for the power and u need more cone control
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Old 09-28-2010, 08:10 PM
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no i got no MDF thats tall enough i dontt hink i dont loose cone control i dont think

dont you need more port for more power?
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Old 09-28-2010, 08:14 PM
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well what are the subs doing when u say there is "port compression"

have you oscoped the amp at those volume numbers? maybe 48-52 is where clipping starts and thats what u are hearing since u are so far past rms, lol
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