Port tuning questions

[Pitchblack98 10+ year member]

I have a couple of questions I can't seem to get a direct answer to...

I know the rule of thumb is about 15 sq.in. of port area per 1 cu.ft. of air space. How thin can the opening of the port be before issues come up? Say I have a 4.3 cu.ft. box I want to tune to 32hz. Can I have a 2"x34" port opening without any ill effects if its long enough for the correct tuning?

Also when designing a rectangle port, is there anything to take into account if the port is a labryrinth instead of a L-shape? Like the picture below...

Click to read more...

 

[jshak07 10+ year member]

Build it, Test it, if your not happy, repeat steps 1 and 2 and let us know what you find out!

 

[tRiGgEr 5,000+ posts]

look up port end correction. That sketch doesn't look like it applies it at all.

 

[Pitchblack98 10+ year member]

look up port end correction. That sketch doesn't look like it applies it at all.

I actually drew up that sketch really quickly to make sure what I was talking about made sense to everyone. Its not the actual box I am trying to design. I'll have the port end correction factored in when I finalize the design. Thanks