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Old 05-05-2013, 12:44 PM
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Default ported box tuning issue??

i have been installing my own systems for years and the use of the re audio box calculator has made it easier.

i recently built a box for 2 12 inch obsidian audio 12d4 v2 subs for my chevy Colorado xcab. my problem is the bass does hit low but seems boomy at the beginning of the bass notes. like boom bummmmmmm or whatever lol. it believe it should be tuned to around 34.6 hz or so. the problem with the re audio box maker is they only allow for the port at the end of the box and i made mine in the center so the port is pushing air in the center console area. there is plenty of room for the port to breathe so i know this isnt my problem.

the dimensions of the box are 49w-16h-14d with a 4 inch port that cuts to 2-2inch ports at the angles. the length of the port is 11 deep to the angle and 15 deep after the angle. there is no divider in the center of the port. not sure if this is my problem. can anyone do the math for me to make sure i did this correctly? and the fact that i didnot divide the port of put a 45 in there, could this be a problem as well?

i had this setup in my lexus rx suv and it was insane. i thought i would be even better in my xcab truck, less area. here is a vid of the setup in my lexus. it was a diff. box in this setup tho. btw the amp is a t1500bdcp and does hammer these obsidians. thanks for any input guys. have a great sunday
Obsidians in obsidian audio 12(2) - YouTube
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Old 05-05-2013, 12:52 PM
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here is a pic of the setup with my t1500 and old school 360.6



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Old 05-05-2013, 12:55 PM
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sadly, loading in an extended cab truck is a lot different than in an SUV.

if it were mine, I would fire the subs and port down in the truck with about 5" of clearance between them and the floor.




note; There is slim chance that the tuning is correct in that box.

If tuning can not be corrected, I suggest sealing the port.
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Old 05-05-2013, 01:11 PM
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i heard 10s firing down in a f150 recently and was surprised at how loud they were. i had one 12 alpine type r in the truck prior to this setup ported and it seemed loudest firing back, although not feasible at the time because it would have eventually hit the back wall of truck because i built the box too deep. i was just flipping the box around experimenting. but i did not try it down firing because i didnt build the box like that

my current box could not be converted to the downfiring setup, again, because now its to high, so if i flipped it and put some 5 inch legs, i would be humping the dash board lol... but maybe ill give it a try just to see if there is significate differences and maybe build another box ( ahhhh ) thanks for the reply.

anyone else have experience with this truck, and ported boxes, i would love to hear from you.
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Old 05-05-2013, 01:15 PM
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Quote:
Originally Posted by iamsonic View Post
sadly, loading in an extended cab truck is a lot different than in an SUV.

if it were mine, I would fire the subs and port down in the truck with about 5" of clearance between them and the floor.




note; There is slim chance that the tuning is correct in that box.

If tuning can not be corrected, I suggest sealing the port.
a slim chance that the tuning is correct? do you see anything that could be wrong with the tuning? i had done the calculations on another site and came up with nearly the same results. my lexus box was tuned to 32.5 and i felt a little higher tuning would help with the music i listen to. i was losing most higher bass notes completely 50+hz... thanks
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Old 05-05-2013, 01:20 PM
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I some calculations and your tuned close to 44hz, so your way off, the only way to fix it is build a new one i believe
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Old 05-05-2013, 01:53 PM
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Quote:
Originally Posted by Jfool289 View Post
I some calculations and your tuned close to 44hz, so your way off, the only way to fix it is build a new one i believe
how did you come up with 44hz? i used this program as a backup and it said i needed a 26 inch long port to get 34 hz. thats at 3.9 cf 4 inch wide port 14.5 inch high port.

Port Length Calculator
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Old 05-05-2013, 01:57 PM
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Quote:
Originally Posted by Jfool289 View Post
I some calculations and your tuned close to 44hz, so your way off, the only way to fix it is build a new one i believe
If he is tuned to 44hz and doesn't want to build a new box u might beable to
Fit a jig or scroll saw in threw the sub holes to shorten the port length.

I had 4 8" Infinity Ref's in a 3.6cu ft box tuned to 32hz with 2 3" aero port and I installed them in my buddies Silverado Xcab and found that subs forward ports up worked great.

Also my currant box layout is similar to yours (5.8cu ft tuned to 29hz with 2 13w7's, subs and port on the same baffle, port between subs) and I did use a divider down the center of the port but ended up ripping it out and it did raise my tuning a tad but it absolutely slams even without a 45 to direct air out the port.
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Old 05-05-2013, 02:24 PM
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Quote:
Originally Posted by Raptor660 View Post
If he is tuned to 44hz and doesn't want to build a new box u might beable to
Fit a jig or scroll saw in threw the sub holes to shorten the port length.

I had 4 8" Infinity Ref's in a 3.6cu ft box tuned to 32hz with 2 3" aero port and I installed them in my buddies Silverado Xcab and found that subs forward ports up worked great.

Also my currant box layout is similar to yours (5.8cu ft tuned to 29hz with 2 13w7's, subs and port on the same baffle, port between subs) and I did use a divider down the center of the port but ended up ripping it out and it did raise my tuning a tad but it absolutely slams even without a 45 to direct air out the port.
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Shortening the port would tune it higher....
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Old 05-05-2013, 03:09 PM
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i was thinking the same.
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