Idea: inner end of port angled, not flared

[Datoyminaytah]

This is just an idea. I haven't found any references to it being done before. Let me know if you do.

The ends of ports are sometimes flared. This looks good but requires extra work, either in buying or making parts and assembling them.

I was thinking, for the hidden end of the port inside the enclosure, wouldn't an angled cut do essentially the same thing? It would make the opening effectivly larger. It would be much easier to saw the end of a piece of PVC pipe at an angle than to flare it. Maybe even the direction it faces could make a difference, like a bend in the port. If so, that could be useful, too, by eliminating a bend to point the end of the port in a certain direction.

What do you think? Worth experimenting with, or not?

[kec]

I have done this on my Alesis M1 clones and a computer sub. I read about this in the Alesis M1 manual (see attachment, go to page 44 under Enclosure - Material & Construction). I also read somewhere else that a 45 degree cut on the inside port reduces noise.


-Ken

[Datoyminaytah]

That's great!

Unfortunately the attachment link doesn't work for me.

Hmm...I think it's case sensitive. This link works.

http://alesis.com/downloads/manuals/...KII_Manual.pdf

[mazeroth]

Say you have to use a 6 inch length port. Do you make the uncut part 6 inches or do you just cut the 6 inch port with a 45 degree? I would think you would have to compensate and add more length depending on the diameter of the port.

[markp]

The 45degree angle on the port would act like a larger opening to reduce turbulance. The question is: do you make the calculated length of the port the 50% point of the 45^ angle or do you add the 45^ to the end of the propper length?

[Dave Jones]

One of the recent AudioXpress mags showed how to make a flared port using PVC pipe, by rounding out the cabinet material on one end and a board on the other end. Use a router to round out the inside of the board and part of the PVC.

[Variac]

I would think that you would make the cut so the dimension you want is at the midway of the cut, ie there is half the opening longer and half shorter