 |  | |  | | Supporting Member
Join Date: Jun 2007 Location: Saint John, New Brunswick Posts: 102
| i'm trying to design a sub box with 2 ports aiming straight up (will be aiming where 6x9 speakers here in my back deck)
the problem i run into is that with 3" round ports, my port velocity comes out around 28m/s and the lengths are 20" each.. which will not fit
i'm open to suggestions if anyone could help out
__________________
2002 Pontiac Grand Prix GT (Sedan)
Alpine CDA-7995 HU
Alpine MRP-F250 4chan amp
Zenon 2200w/1ohm mono amp
12" Rockford Fosgate T2 sub | 
|  | |   | | | | | CCA Back Bacon
Join Date: May 2007 Location: bc parksville Posts: 31
| slot port it | |
| | | | | | | | Supporting Member
Join Date: Jun 2007 Location: Saint John, New Brunswick Posts: 102
| i would, but being a fairly large sedan, i want to direct the ports through the holes where the rear speakers were
__________________
2002 Pontiac Grand Prix GT (Sedan)
Alpine CDA-7995 HU
Alpine MRP-F250 4chan amp
Zenon 2200w/1ohm mono amp
12" Rockford Fosgate T2 sub | |
| | | | | | | | CCA Back Bacon
Join Date: Feb 2008 Location: Tottenham, Ont Posts: 36
| do you have a diagram to show what your looking for. Also box size and tuning freq.
If you're using pvc pipe for the port I would get some 45deg joints. 90s are too sharp. Also flare the ends to reduce port noise. | |
| | | | | | | | CCA Hoser
Join Date: Aug 2007 Location: Between London and K\W Posts: 387
| 3" ports are not alot of good for anything over 8" subs.Try 4" or 6" at 12"long.How ever it is hard to say without sub size and box size
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Truck:1997 Ford F-150 STD. Cab 408ci.Twin turbo
Audio:Eclipse,Digital Designs,Phoenix Gold,American Bass
NEGATIVE. | |
| | | | | | | | Supporting Member
Join Date: Jun 2007 Location: Saint John, New Brunswick Posts: 102
| it's a 12" rockford fosgate t2, i ended up just building the spec enclosure for now
__________________
2002 Pontiac Grand Prix GT (Sedan)
Alpine CDA-7995 HU
Alpine MRP-F250 4chan amp
Zenon 2200w/1ohm mono amp
12" Rockford Fosgate T2 sub | |
| | | | | | | | CCA Hoser
Join Date: Aug 2007 Location: Between London and K\W Posts: 387
| well for daily driver its likly best to stay with that, as RF do do some R&D for boxes to find the over all best box.
And 3" is real small for that sub
__________________
Truck:1997 Ford F-150 STD. Cab 408ci.Twin turbo
Audio:Eclipse,Digital Designs,Phoenix Gold,American Bass
NEGATIVE. | |
| | | | | | | | Supporting Member
Join Date: Jun 2007 Location: Saint John, New Brunswick Posts: 102
| it's almost disappointing trying to make this car sound good and loud :P
__________________
2002 Pontiac Grand Prix GT (Sedan)
Alpine CDA-7995 HU
Alpine MRP-F250 4chan amp
Zenon 2200w/1ohm mono amp
12" Rockford Fosgate T2 sub | |
| | | | | | | | CCA Back Bacon
Join Date: Jan 2008 Location: Ontario Posts: 1
| Could you just do 4 ports instead of 2? | |
| | | | | | | | CCA Hoser
Join Date: Aug 2007 Location: Between London and K\W Posts: 387
|  Quote: |
Originally Posted by zimme  Could you just do 4 ports instead of 2? | yes but they need to be a good bit longer to stay tuned the same
also leaving less box space or going to a bigger box
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Truck:1997 Ford F-150 STD. Cab 408ci.Twin turbo
Audio:Eclipse,Digital Designs,Phoenix Gold,American Bass
NEGATIVE. | |
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