anyone know the 1/2 wave theory formula?

[basscort2009 5,000+ posts]

anyone??

 

[pr-festiva 10+ year member]

half wave would be about 78Hz,,im not sure if thats what your asking though

 

[basscort2009 5,000+ posts]

nice thats what i got too. i did.25 and .5 wave theory. 3/4 would be like 120 htz or so lol

for .25 wave theory i did 1130/39 = 28.97

then 28.97 x .25 and got 7.24 ft.

thats close enough for me

 

[pr-festiva 10+ year member]

i just did 1130/39 then/2 i tryed a 1/4 wave wall once and it didnt work out,but that was awhile back

 

[basscort2009 5,000+ posts]

well im def not tuning to 78 so 39 it is lol

 

[pr-festiva 10+ year member]

tuneing to 78 would put you at the zero pressure, zero velocity part of the wave i think.the highest pressure is at the 1/4 and 3/4 points and the highest velocity is right before a cross over point between a crest and a trough(sorry i cant spell for sh1t).its been a while since i done any looking in to of this kind if design so i may very well be wrong.

 

[basscort2009 5,000+ posts]

ok cool thanks man for actually helpin me out with that.

 

[JimJ 5,000+ posts]

Failure...

 

[Blue Fury 10+ year member]

I'm not sure you'll get the results you want, I see it more possible that even though you design the box perfectly to your half or 1/2 wave specs, the actual behavior of it will be that of a 1/4 design using the length of your vent as 1/4 of the full wavelength not 1/2 because you want it to. I may be entirely wrong though.

 

[ciaonzo 5,000+ posts]

Failure...

Complete.