Beginer

08-16-2008, 04:15 PM

Hello,

I've been searching and found some threads about end correction, but still I don't get it :)

I use this formula to findout box tuning freq.:

Fb = 0.159*SQRT[(Av*(1.84*10^8)]/(Vb*1728*[Lv+(.823*SQRT(Av))])

Vb - net volume(all displacements taken into account), Fb - tuning freq., Av - port area, Lv - length of the port.

1. Does this formula include end correction?

2. Let's say I want to build 2.5cu.ft., port 4" width, 13" height, tuned to 45Hz. So what physical length of the port should be?

I get ~20". So physical port length should be 18" (20"- 2"(half port width))? :confused:

Thanks.

I've been searching and found some threads about end correction, but still I don't get it :)

I use this formula to findout box tuning freq.:

Fb = 0.159*SQRT[(Av*(1.84*10^8)]/(Vb*1728*[Lv+(.823*SQRT(Av))])

Vb - net volume(all displacements taken into account), Fb - tuning freq., Av - port area, Lv - length of the port.

1. Does this formula include end correction?

2. Let's say I want to build 2.5cu.ft., port 4" width, 13" height, tuned to 45Hz. So what physical length of the port should be?

I get ~20". So physical port length should be 18" (20"- 2"(half port width))? :confused:

Thanks.