has anyone out there heard of interchangeable ports for boxes and if so is it a hassle to build. cause right now i hav a box tuned to 32 and i like it a lot but for comps its not going to due all that well and i really dont want to hav to keep on switching boxes in an out if you know wat i mean
Replies (5)
ShootuhMcBustaCap on 06/17/2007 11:14:15
I feel your pain man, and yes, it can be done. Although I have never personally done it, i have read about it being done successfully here and in MANY car magazines.
Generally, it is done by calculating the tuning for each frequency you want, and you make round ports that can be easily removed and reattached so it works. Also, this probably won't work too well with a slot ported box.
Also saw a 240SX that had a custom plate that could be bolted down over the ports of his sick little box to change from ported for SPL comps, to sealed for SQ comps. Thought it was pretty smooth Idea myself.
But, you probably would want to do some more research to make sure that your box's paramaters wouldn't damage your subs do to the difference in port tuning and internal dimensions.
swez on 06/17/2007 13:01:46
Yes, even slotted ports can be modified on the fly with some careful planning of the enclosure. One can use dado or a router to cut channels and widen or make narrow the port opening for adjustable tuning baffle panels.
If you have a long "L" type port, this is more difficult to do. But if the port is just one deep panel, much easier to make changes on the fly. The trick is sealing the tuning baffles so they fit snug and don't leak air. That can be accomplished by using narrow strips of foam tape to prevent leaks.
Say more about your present sub box configuration,
Swez
30Hertz on 06/17/2007 14:31:46
Like everyone else said, it can be done GRIN .
Ofcourse the easier port to just swap in and out would be a circular port, but if your like me....you hate circles and have to go slot port.
Slot ports can be swapped out like Swez has stated pretty easily assuming you know the displacement of each port, and have calculated the tuning freq. for both ports (after their displacements within the box, if that makes sense). Depending in the box size and the tuning frequency it can be quite the hassle tho if one of your ports has a bend. This usually happends for lower tuning obviously since the port has to be longer to account for the length needed.
Have you built many enclosures? Are you good at the math involved? And are you ready to give it a try?
Let us know GRIN
-30
COFFEE
ace23 on 06/17/2007 14:55:25
my current box was just a project box based off the horn port but instead of tuning it high i tuned it to 32 hrtz to see if it would hit the low's good i made it 6 cubes including the port for 2 12's and it hits the lows pretty good when i got meterd i hit a 140.3 on the new term but i figured the set up i have has much more potential and i believe i can get just a lil bit more db's with a higher tuned port but i feel if i make another box and tune it higher i wont get the same effect with low bass as i do now then i started reading up on one of steve meade's box designs and he has interchangeable ports he uses the higher tuned ones for comps and this is what gave me the idea to try and make a box like this. i hav built around 5 enclosers some just for projects and some for my friends, i'm not to bad at the math enough to get the job done and i'm always up for a new challenge. here's the website to the photo's of the box that gave me the idea http://www.stevemeadedesigns.com/board/index.php?showtopic=144
swez on 06/18/2007 18:33:11
Good read and lots of pics too. Four x 18" subs in a variable ported box seems like overkill, but to be a successful DB Dragger, it takes all that and all the power aspects too. Look at the bank of batteries in the back of this vehicle. Wow.... this guy must have 1,000 lbs of gear in the back of this truck. (Wonder what it is?)
Nice planning, lay out and wiring job too. Look well at the details.
Swez
Replies (5)
ShootuhMcBustaCap on 06/17/2007 11:14:15
I feel your pain man, and yes, it can be done. Although I have never personally done it, i have read about it being done successfully here and in MANY car magazines.
Generally, it is done by calculating the tuning for each frequency you want, and you make round ports that can be easily removed and reattached so it works. Also, this probably won't work too well with a slot ported box.
Also saw a 240SX that had a custom plate that could be bolted down over the ports of his sick little box to change from ported for SPL comps, to sealed for SQ comps. Thought it was pretty smooth Idea myself.
But, you probably would want to do some more research to make sure that your box's paramaters wouldn't damage your subs do to the difference in port tuning and internal dimensions.
swez on 06/17/2007 13:01:46
Yes, even slotted ports can be modified on the fly with some careful planning of the enclosure. One can use dado or a router to cut channels and widen or make narrow the port opening for adjustable tuning baffle panels.
If you have a long "L" type port, this is more difficult to do. But if the port is just one deep panel, much easier to make changes on the fly. The trick is sealing the tuning baffles so they fit snug and don't leak air. That can be accomplished by using narrow strips of foam tape to prevent leaks.
Say more about your present sub box configuration,
Swez
30Hertz on 06/17/2007 14:31:46
Like everyone else said, it can be done GRIN .
Ofcourse the easier port to just swap in and out would be a circular port, but if your like me....you hate circles and have to go slot port.
Slot ports can be swapped out like Swez has stated pretty easily assuming you know the displacement of each port, and have calculated the tuning freq. for both ports (after their displacements within the box, if that makes sense). Depending in the box size and the tuning frequency it can be quite the hassle tho if one of your ports has a bend. This usually happends for lower tuning obviously since the port has to be longer to account for the length needed.
Have you built many enclosures? Are you good at the math involved? And are you ready to give it a try?
Let us know GRIN
-30
COFFEE
ace23 on 06/17/2007 14:55:25
my current box was just a project box based off the horn port but instead of tuning it high i tuned it to 32 hrtz to see if it would hit the low's good i made it 6 cubes including the port for 2 12's and it hits the lows pretty good when i got meterd i hit a 140.3 on the new term but i figured the set up i have has much more potential and i believe i can get just a lil bit more db's with a higher tuned port but i feel if i make another box and tune it higher i wont get the same effect with low bass as i do now then i started reading up on one of steve meade's box designs and he has interchangeable ports he uses the higher tuned ones for comps and this is what gave me the idea to try and make a box like this. i hav built around 5 enclosers some just for projects and some for my friends, i'm not to bad at the math enough to get the job done and i'm always up for a new challenge. here's the website to the photo's of the box that gave me the idea http://www.stevemeadedesigns.com/board/index.php?showtopic=144
swez on 06/18/2007 18:33:11
Good read and lots of pics too. Four x 18" subs in a variable ported box seems like overkill, but to be a successful DB Dragger, it takes all that and all the power aspects too. Look at the bank of batteries in the back of this vehicle. Wow.... this guy must have 1,000 lbs of gear in the back of this truck. (Wonder what it is?)
Nice planning, lay out and wiring job too. Look well at the details.
Swez
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