Port length Question

[kyle7560 10+ year member]

I'm building my first box with a flared psp port and I used the psp port calculator to find the length and i was wondering if the length the give me is the length the tube needs to be or the length including the flares. Any help would be greatly appreciated.

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[hoxie08 5,000+ posts]

i believe the tube not including flares... but let someone else chime in too lol

 

[kyle7560 10+ year member]

ok thats what i thought. thanks

 

[bjfish11 5,000+ posts]

Its the length of the entire port assembly.

 

[BrianChia 10+ year member]

The effective port length is typically the tube plus 1/3-1/2 the length of each flare depending on the size and dimensions of the flare. I'm not sure if the PSP calculator takes that into account or not. The difference is usually negligible if you're using multiple or fairly large ports.

 

[bjfish11 5,000+ posts]

I believe in the instructions included with the port, when figuring the length it says to sub tract 6" (length of the combined flares) for a 4" port, and cut the tube at that.

 

[SPL Blazer 10+ year member]

Where do you get your info from? Holy crap, does anyone research things before giving advice? Look at their website, and under the "installation instructions" link you choose what size your using. The 2" aero port requires 4" to be cut off, and the 3", 4" and 6" ports all say to trim 5" off.

 

[60ndown 10+ year member]

Where do you get your info from? Holy crap, does anyone research things before giving advice? Look at their website, and under the "installation instructions" link you choose what size your using. The 2" aero port requires 4" to be cut off, and the 3", 4" and 6" ports all say to trim 5" off.

newb pwns //content.invisioncic.com/y282845/emoticons/veryhappy.gif.fec4fed33b4a1279cf10bdd45a039dae.gif

 

[SPL Blazer 10+ year member]

newb pwns //content.invisioncic.com/y282845/emoticons/veryhappy.gif.fec4fed33b4a1279cf10bdd45a039dae.gif

lol, I'm a noob on this forum but I've been around others for awhile. I prefer the Termpro forums.

And the PSP calculator is pretty ****ed good too. I used their calculator for my most recent enclosure and then tested it with my Termlab meter and it was dead on. Very good calculator.

 

[bjfish11 5,000+ posts]

Where do you get your info from? Holy crap, does anyone research things before giving advice? Look at their website, and under the "installation instructions" link you choose what size your using. The 2" aero port requires 4" to be cut off, and the 3", 4" and 6" ports all say to trim 5" off.

Sorry I was 1" off... Thats why I said, I believe thats what it was. I figured someone that had a port could read the instructions for sure. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[bjfish11 5,000+ posts]

And actually, it depends on how you calculate it for sure. In a sense, both of us were correct.

I found the installation instructions included with a 4" port. It has the formula for lv. Once calculated, it says subtract 5". Then when its assembled, a flared port will be 1" longer than lv. Well on the psp-inc site, it has length for both straight and flared ports. If you use the flared port length, you need to subtract 6" off the length and cut the tube at that (because it has already added the extra 1" onto the lv). But if you use the straight port length, subtact 5" so that you can gain the extra 1" on overall port length.

 

[SPL Blazer 10+ year member]

But using the straight port length isn't for the aero port, it's for a regular round tube port.

 

[bjfish11 5,000+ posts]

But using the straight port length isn't for the aero port, it's for a regular round tube port.

Thats what I was saying. The standard formula for giving you port length with yield a length for a straight port. With a flare, you have to add an extra inch.

But thats where it can get confusing when talking about trimming 5" off or 6" off.

 

[pr-festiva 10+ year member]

So for a ten inch flared port in 4cubes tuned to 61 hz the length with out flares will be 7.91? then add the flares to the end.

 

[bjfish11 5,000+ posts]

No, it will be 7.91" long with the flares attached. So to calculate the length of the straight piece, take 7.91 and subtract the length of the flares.