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Precision Port 4" Flared Speaker Cabinet Port Tube Kit
I calculate I need a 4.129 in. straight length and 4 in. port. With inside and outside flares minimum length is 5 in. Do I use the inside flare (5 in.) or outside flare only with straight tube (4.129 in straight length)? Pros/cons of each please Thanks!
You can either couple the flares together without the tube for a total port length of ~5" and drop your tuning frequency very slightly, or not bother with the inside flare and add about 1-5/8" of tube to the outside flare to get closer to the desired length. Depending on the size of the woofer, not having the inside flare will hardly affect anything.
Date published: 2015-01-16
do the flared ends add length? so if I need a 15" long port i'd cut the 17" long tube to 15" to make a 15" port or do the flared ends add length?
Yes the flares do add usable length to the port. We recommend cutting the tube itself 5" shorter than the design length calls for for the same tuning frequency once the flares are added.
Date published: 2014-12-17
I need a 10 inch long port can I use two 5 inch ports for the same results?
No, two ports that add up to 10" will not give you the same results as a single 10" long port. You can contact our tech support to model port dimensions and box volumes if necessary.
Date published: 2014-12-12
How does the flare affect the overall port length. I know back in the day we used 0.5x the diameter for the length of the flared piece. For example, if using a 3" port, and plans called for a 15" port we would cut the tube to 12". Is that true here also?
It really depends on the flare itself, but in this case that rule can apply without a problem.
Date published: 2014-11-11
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
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.
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.
Not adding the rear flare could add slight chuffing or unwanted port noise but it will allow for a shorter port tube.
Date published: 2014-08-11