port area - air velocity noise?

[Alex JB 10+ year member]

OK, so I calculated a 16 sq" port area for the 2 E8's in my 1.1 gross cu ft box.

The port area I actually can get with my folded port design (my folded design is not ideal, probably going to increase noise from rotating eddy currents in air flow) is 18.3 Sq".

If I don't add material to the walls to reduce the port area, the influence of the increased area seems only to drive an increased port length compared to using the original 16sq" calculated, is this true?

It seems to go from 38.5" long to 45" long when increasing the port size.

Basically I wanted to go larger with the port to avoid noise and had a little space to play with to get longer port lenght to accomodate...

Is it going to help?

Click to read more...

 

[Alex JB 10+ year member]

No one?

larger and longer port = same tune freq, but avoid wind noise in folded slot port?

 

[SPY 5,000+ posts]

that is correct. as port area increases the port length also increases to keep the same tuning, unless of course the vol of the enclosure is increased.

 

[FootlongSam 10+ year member]

truf