Precision Port 4" Flared Speaker Cabinet Port Tube Kit

Brand:| Model: PSP4-BKHT
The unique flared-end construction of the Precision Port system enables it to outperform any standard port tube on the market. Conventional tubes suffer from nasty turbulence at the entrance and exit of the port, producing unwanted noise and poor sound quality.
Part # 
Weight: 1.64 lbs.  
List Price$19.99
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Buy 4-up$12.50
Part # 268-352
Qty:  EA
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Product Details

Precision Port 4" Flared Speaker Cabinet Port Tube Kit

The unique flared-end construction of the Precision Port™ system enables it to outperform any standard port tube on the market. Conventional tubes suffer from nasty turbulence at the entrance and exit of the port, producing unwanted noise and poor sound quality. The Precision Port™ system overcomes these problems and as a result can actually produce a gain of up to 3 dB in output!

Now you can experience good looks, low distortion, and superior overall sound quality thanks to the Precision Port™ system. Convenient front screw holes make this tube easier to install than others on the market. Create a port up to 17" long, then glue with ABS glue found at any hardware store. Installation instructions included. Dimensions: • 7-1/4" outside flare outer diameter • 6-1/4" cutout • 6-3/16" inside flare outer diameter. Also available in 2", 3", and 6" diameters. Proudly Made in the USA!

To calculate the proper port length for your cabinet and tuning, use Precision Sound Products' Port Length Calculator.

Precision Port 4" Flared Speaker Cabinet Port Tube Kit
  • BrandPrecision Sound
  • ModelPSP4-BKHT
  • Part Number268-352
  • UPC844632046797
  • Product CategorySpeaker Port Tubes
  • Unit of MeasureEA
  • Product Rating
    (56 Reviews)
  • Weight1.64 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

View similar products to the Precision Port 4" Flared Speaker Cabinet Port Tube Kit
in the Speaker Port Tubes product category.


Precision Port 4" Flared Speaker Cabinet Port Tube Kit
Precision Port 4" Flared Speaker Cabinet Port Tube Kit is rated 4.75 out of 5 by 56.
Rated 5 out of 5 by from port noise! what port noise?these ports does an excellent job of bringing out some smooth,clean,clear and loud bass.
Date published: 2014-10-12
Rated 5 out of 5 by from Doesn't play well with Dayton portsPrecision and Dayton ports of the same size do not interchange, such as I need two 26 inch long ports and have to use a 90 at about 14 inches. I also bought Dayton 4" 90's and the lengths assuming they'd work together. They don't. So with some glueing and piecing together, I've managed to make what I need, but the two ports are different, so don't make the same mistake I did. Other then that, it's great and Parts Express always get's me what I need fast.
Date published: 2014-10-11
Rated 5 out of 5 by from Awesome productI used two of the 4 inch ports an built a sub enclosure for a local stereo shop and they were amazed at the way it sounded
Date published: 2014-06-01
Rated 5 out of 5 by from Flared PortExactly what I needed! No 'huffing' at all and made a huge difference in sound quality! Highly recommend
Date published: 2014-02-23
Rated 5 out of 5 by from As advertised, good fitment, good documentationThis was exactly what I needed to finish my sub build. The parts fit together perfectly, and the necessary calculations are provided in case you don't have a box design program or something else.The only niggle I have is that it would be really great if they included a small packet of PVC adhesive, as this is not something most people keep around. It would save some folks a trip to the store for maybe $1 additional cost. It's a very minor gripe.Great product!
Date published: 2013-06-07
Rated 5 out of 5 by from Best port ever!!I purchased two of these ports for a custom box. I've always been told that flared ports sound better then jus straight pcv pipe. So i decided to test the difference. I installed straight pipe ports first and listened to it, sounded good. I then installed these flared ports and I was blown away by the difference in sound. It sounded sooo much cleaner, louder, and tighter. I highly recommend if you want a loud and good sounding box.
Date published: 2012-12-19

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email tech@parts-expresss.com  for a prompt reply.
Precision Port 4" Flared Speaker Cabinet Port Tube Kit

what is the displacement of your 4 inch diameter flared port tube,, I was going to put it in a subwoofer box an I need to know so I can calculate my internal volume

Asked by: bobby35
We can help calculate that for you. The displacement will depend on the length of the port. If used as the full 17 inch overall length, the displacement is 0.14 cubic feet.
Answered by: Chrisf
Date published: 2014-10-03

What difference does the inside flare make. Cause I can't use it in my situation. Unless I cut the port really short. And I do not want that. It's for a 18 so a lot of air will be moving.

Asked by: derek82
Not adding the rear flare could add slight chuffing or unwanted port noise but it will allow for a shorter port tube.
Answered by: MattP
Date published: 2014-08-11

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
Asked by: Kevin R
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.
Answered by: MattP
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?
Asked by: VusstoppyPro
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.
Answered by: MattP
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.
Asked by: cnp112
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.
Answered by: Mseries
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.

Asked by: cnp112
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!
Answered by: Travis Rysdam
Date published: 2012-12-06

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