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View Full Version : A question for you Precision Port users...



RAM_Designs
08-11-2008, 11:33 PM
I'm designing a 6th order BP box for my sub, and I'm kinda limited on space(being able to fit it through the door). I have 7.5" worth of height in the front chamber to work with, and the cutout for 4" PSP's is 7.25". I can get the cutout done fine, not really worried about that...but can I fit the flared port on the back with just 7.5" of clearance in there?

http://i45.photobucket.com/albums/f92/RyanM923/Autotek%206th%20BP%20Build/Aeroportdesign.png

In other words, what's the diameter of the rear flare of a 4" PSP?

cycloneman
08-11-2008, 11:39 PM
6 1/4"

RAM_Designs
08-11-2008, 11:40 PM
6 1/4"

awesome, so I'm golden!?!?

And you are referring to the ones that are sold by partsexpress/psp-inc, correct?

funkyab
08-11-2008, 11:42 PM
u got the dimension,,, u tell us...........

make sure to have your ports glued together properly and i mean REALLY PROPERLY... i have blown 2 apart and watch the sub start to stress out!!!!

cycloneman
08-11-2008, 11:42 PM
yep...Just grabbed one from the basement and measured it :)

I have 4 of them waiting for a new build.








100th post!!! Does this give me permission to call people noobs now? :)

bball09124
08-11-2008, 11:46 PM
the way that sub is going to be positioned is going to kill efficiency.

bass-aholic
08-11-2008, 11:47 PM
yep...Just grabbed one from the basement and measured it :)

I have 4 of them waiting for a new build.








100th post!!! Does this give me permission to call people noobs now? :)

no.....absolutely not. but thanks for asking

RAM_Designs
08-11-2008, 11:49 PM
the way that sub is going to be positioned is going to kill efficiency.

It's the only way I can do it....the sub is too big to configure it any other way and still be able to fit it through the door.

cycloneman
08-11-2008, 11:52 PM
no.....absolutely not. but thanks for asking

Well....it as worth a shot:D

tommyk90
08-11-2008, 11:56 PM
What sub and what is the airspace of each side? Obviously it's a parallel tuned but I'm curious as to why you decided to go with a 6th order in such a small space.

RAM_Designs
08-11-2008, 11:58 PM
What sub and what is the airspace of each side? Obviously it's a parallel tuned but I'm curious as to why you decided to go with a 6th order in such a small space.

Autotek XS-2111

Front chamber is 4ft^3, rear is 5ft^3...roughly. I can make the box bigger, but then I end up with 3" long ports if I use three 4"ers for each chamber, and I can't fit the 6" ports in the space I have available for the front chamber.

Also, front chamber is tuned to 57hz, rear at 50hz.

tommyk90
08-12-2008, 12:09 AM
Autotek XS-2111

Front chamber is 4ft^3, rear is 5ft^3...roughly. I can make the box bigger, but then I end up with 3" long ports if I use three 4"ers for each chamber, and I can't fit the 6" ports in the space I have available for the front chamber.

Also, front chamber is tuned to 57hz, rear at 50hz.

I'm hoping youre going for SPL with that kind of tuning?

RAM_Designs
08-12-2008, 12:18 AM
I'm hoping youre going for SPL with that kind of tuning?

Oh, of course. There's a nice 23db peak at 54hz...we'll see how well that transfers over to my truck.

http://i45.photobucket.com/albums/f92/RyanM923/Autotek%206th%20BP%20Build/responsegraph.jpg

^^^That was back when I was fiddling with different things, but the way I have it now is nearly identical as far as the peak goes. I'm going for all-out spl, hence the psp's that I can adjust on the fly.