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Precision Port 4" Flared Speaker Cabinet Port Tube Kit
how short can the tube be ?
Using the port calculator for my speaker cabinet project the difference is only one inch .Is this enough to attach the two flares to ?Is there a minimum tube size requirement to adequately attach the flares together with the pipe ?I can't go to a smaller port size
The shortest affective port length you can have is with both flares coupled together (excluding the tube completely) and this will result in a port length of roughly 3-1/2", not including the flared ends.
Date published: 2013-07-29
Does a port always have to be inside the cabinet?
What I mean can I put a port outside rather than inside and sill function the same as if it were inside?
No the port does not need to be on the inside, it will do the same thing if it were on the outside of the cabinet.
Date published: 2013-01-14
What glue to use besides PVC Primer/Cement?
I know the instruction say to use PVC Primer/Cement or ABS Cement, but is there something else that would prove to be just as good and a little easier to work with like rubber cement, gorilla glue, etc. Thanks.
Rubber cement or Gorilla glue will probably work but probably wont last very long. I didn't have any pvc glue so I used some glue for building model cars. Basically anything that will melt the plastic will work and last. Super glue might work well.
Date published: 2013-01-13
Can I extend this port kit to a longer length with 4" PVC Pipe from my local hardware store instead of buying the PSP-4TB plus the connecting rings.
Yes, this will work fine. However, it would be prudent to bring these flares with you when shopping for your PVC pipe. PVC wall thickness varies according to it's schedule rating, and 4" pipe does not have a have an inside, or outside diameter of 4", it's actually 4.5" outside. The schedule (wall thickness) then determines the inside diameter. Schedule 40 PVC has a wall thickness of just under a quarter of an inch (.237"), so it's inside diameter would be just over 4" (4.026"). That would be your best bet, but I can't definitively tell you that the port flares would fit on the PVC pipe.Another option would be black ABS pipe for a better aesthetic match. Use ABS cement if you use ABS pipe, and PVC cement if you use PVC.You can also buy PVC or ABS "elbows" so you can put bends in your port, allowing you to get more creative with your port placement, since it is so long.The real value of this kit is the flared ends which reduce port noise and turbulence. Whatever type of tube you put between them is inconsequential as long as it is sturdy and of the right length for your tuning.One last thought, you may want to consider using a smaller diameter port, as it will not need to be so long. Remember that the more volume your port takes up, the less useful volume your box has.Whatever you do, have fun!
Date published: 2012-12-06
what can i use to make this port 25 inches long
You could buy 2 kits and secure two lengths of tube together with a solid external collar brace to achieve the necessary legth. You could use some left over tube, slit it down one side, and secure it around the junction of the 2 pieces you are joining with ABS cement. You could even do that twice, one from the top, one from the bottom for a really secure hold.Though, honestly if your tuning requires such a long port length you may want to look at using a smaller diameter port in order to reduce the necessary port length. A 3" port would need to be much shorter to achieve the same tuning frequency.For example with a 1.5 cubic ft box and a desired 28Hz tuning a 4" dia. port needs to be 25.875" long. Whereas a 3" dia. port only needs to be 14" long to achieve the same 28 Hz tuning in the same box.
Date published: 2012-07-09
What is the "flare radius"?
I have a program (Flare-it) that tells me if I will have port noise. I'm trying to calculate the "flare radius".
7.250" OD according to the description. Radius is half that, 3.625"Flared ports don’t necessarily provide any advantage over straight tubes. What would make a difference is if you stuffed the tubes with soda straws to “columnate” the flow like a LASER or Vegas water-fountain nozzles.This WOULD reduce vortex effects but still may not make a noticeable difference. You would have to have expensive analyzing equipment to denote the actual effect.If someone were to give me some of these, I would whack off the front flare mostly, to keep the hole in the baffle smaller. Meanwhile I use PVC or ABS tubing as a default. They are cheap and you can make a "tunable port" by placing a smaller tube inside a larger tube to make a sliding port. Then glue or cut a new one to length. Keep the tunable one as a tool.
Date published: 2012-10-05