I would like to use PVC as it is easy to come by and easy to use. However, I have got no clue how to calculate the length of the pipe. Can anyone help me out?

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- Thread starter Arne
- Start date

I would like to use PVC as it is easy to come by and easy to use. However, I have got no clue how to calculate the length of the pipe. Can anyone help me out?

I did find the driver in the Loudspeaker database

Qts' = Qts + any added series resistance [Rs]:

GM

Parts Express suggest a suitable sealed volume of 0.06ft^3 (1.7 litres) for the FRS-8.

Obviously, the pipe diameter will have to exceed the driver's overall diameter of 3.07".

Once you've selected the pipe diameter, you can calculate the length required to suit the volume of 1.7 litres.

Start with a longer experimental pipe then shorten it in stages in order to find the optimum length sound-wise.

Stuff the finished pipes with absorbent to kill internal air resonances.

That's OK .... I have developed a new (armchair) system for optimizing T.L. s .

Since the driver Fo goes down as the pipe is lengthened ( by the added mass of the column)

AND

The 1/4 wave Fp also goes down ..... My calculator finds the point where the

2 frequencies converge : ) ....... In this case the Visiton FR8-8 needs to be on a 2"

pipe 41" long for Fsys of 82 Hz ....

????

For ' system volume ' I get

area of 4" pipe = pi * r^2 = 12.56 sq in

so for 96" length volume = 12.56*96 ~ 1206 cu in

convert to liters :

1206 * 0.016 ~ 19 liter

Here's my latest : YouTube

Sonic Pi for synth .... Imagine for slideshow .... My wife singing : )

The 1/4 wave Fp also goes down ..... My calculator finds the point where the

2 frequencies converge : ) ....... In this case the Visiton FR8-8 needs to be on a 2"

pipe 41" long for Fsys of 82 Hz ....

So, some kind of adapter and then glue that to a 2" diameter pipe that gives it a length completed of 41" and then stuff that thing. Completely open ended, or closed, or perhaps some kind of slot?

To make things more manageable :

caps on both ends ....

driver on one end ...... 1" x 4" port on other end

For 8 Ohm model ..... pipe 4" x 13 "

For 4 Ohm model ...... pipe 4" x 27 "

Ok, so when I would use a 4" pipe instead of a 2" pipe, I could almost half the length? And then do a 1" by 4" port at the end? Because I cannot make a 1"x4" port at the end of a 2" pipe.

Right ..... I ' m not sure of my calculator with the adaptor .

4" abs with caps ( home depot )

if you drill a 1" hole in a cap .....

one of these :

https://www.amazon.com/10-Pack-Cut-...=2025&creative=165953&creativeASIN=B00LORILBS

will screw in ( some effort and oil needed )

since they are 3/4 " they can be ~ 1" long

Do you have the 4 or 8 Ohm model ?

4" abs with caps ( home depot )

if you drill a 1" hole in a cap .....

one of these :

https://www.amazon.com/10-Pack-Cut-...=2025&creative=165953&creativeASIN=B00LORILBS

will screw in ( some effort and oil needed )

since they are 3/4 " they can be ~ 1" long

Do you have the 4 or 8 Ohm model ?

Last edited:

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