Tuning question/port length

[412Mark]

I am working on a box 6 cubes 108 square inches of port. I was seeing if anyone knows of could figure out the port length to tune the box at 34 hertz. I tried to download Torres but I am having problems getting it on my computer

[Frank H]

Have you tried downloading an app? BTC (box tune calculator) or Ultimate Car Audio App?

about 35 inches if your 6 cubes is net

[412Mark]

My 6 is net at least that is what I am shooting for. 35 sounds long. I looked up those apps and I could not find them

[Frank H]

Is it a slot port? Can you give me dimensions of box and Ill punch em in the other app.

According to BTC (box tune calculator on android) :

33 inches is 34.15hz

35 inches is 33.36hz

[MotorCityFats13]

exact lengths

33.37 for a square port @34hz

28.17 for a slot port @34hz

unless you measure your cuts with digital caliper's go with these measurements

square port of 33.25" is 34.05hz

slot port of 28" is 34.03hz

the amount away from 34hz will be negligible

I used this web calculator

http://www.carstereo.com/help/Articles.cfm?id=31

[Frank H]

I hadnt realized that a square port needs to be longer than a slot port. Care to explain? Id think the square would be more efficient and require less length.

[Triticum Agricolam]

I hadnt realized that a square port needs to be longer than a slot port. Care to explain? Id think the square would be more efficient and require less length.

You are correct in that a square port is more efficient than a slot port of equal area, however efficiency has nothing to do with tuning frequency. Since slot ports usually share common walls with the rest of the box, this makes them perform like they are longer than the really are, and thus they can be slightly shorter.

[412Mark]

The port will be using two common walls with the enclosure. So I guess slot port then.

[412Mark]

I have an iPhone so that explains why I couldn't find that BTC app

[Frank H]

Thanks for the explanation.