Baffles for PVC tube TL speakers? Would it work?

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Spasticteapot

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Joined 2006
#1
For the sake of my sanity, my first speaker project (that should actually work) is a pair of RadioShack 40-1041 FR drivers in a 4" PVC pipe TL.

Rob Samson's PVC pipe design

I know that the bass on these type of TL's is not great, and the midrange can be bad, too. So, what if I added a baffle?

I have some convenient 2'x3' (600mmx900mm) acrylic panels that would be ideal. How would I mount this on the end of my TL to improve the sound?
 
#3
I think it would be ugly to say the least...

Maybe you can build a notch-lowpass filter combination to enhance things a bit...

You can connect one between the source and the amp...

I made these for on my bike (see picture), not the best sound, but much better than my sony active speakers....

The version I built with a monacor sp-60/8 has quite stunning bass reproduction! This one I made active with two t-amps each side and a 1" softdome, sold them right away to a friend who had to have them for his car....Have no pics, sorry...

Hope I've been of some help to you...🙂
 
#4
oops:
 

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#5
the baffle will increase the output on higher frequencies mainly when your close to the speaker. Usually referred to as baffle step. Try it but I can't see much difference anywhere else.

You can try an infinite baffle. where you would just use the board.
 
#9
Dumbass said:
This implies that you've tried other projects that don't work?
Click to expand...


More accurately, my first project that's being built to proper speaker specs. I've put a speaker driver in a cardboard box, and failed so far in my first two attempts at a Gainclone, but nothing that would constitute a decent listening device.

A piece of 2x4 inside some PVC pipe is pretty simple. Adding a baffle would allow me to adjust for baffle step loss without any messy crossovers.
 
#11
I'm fascinated by the use of PVC and have been for a
while.

For your consideration, here is something that borders
on an art project as sculpture:

http://tpluspod.com/rtl/fostex PVChorn.html


My PVC experiments have included using baffles made
from pressed cork pot stands which you can find in
various diameters at your local home center. These
things are circular and backed by fiberboard.
They're not very sturdy but should at least give a
noticeable effect.
 
#12
loninappleton said:
I'm fascinated by the use of PVC and have been for a
while.

For your consideration, here is something that borders
on an art project as sculpture:

http://tpluspod.com/rtl/fostex PVChorn.html


My PVC experiments have included using baffles made
from pressed cork pot stands which you can find in
various diameters at your local home center. These
things are circular and backed by fiberboard.
They're not very sturdy but should at least give a
noticeable effect.
Click to expand...


Interesting. Thanks for the tip!
I'll probbably just use cardboard 'till I find the desired dimensions.
 
#16
v-bro said:
I saw that pvc-horn before by the way, very cool design!

You can order a kit to build them. 😎 I've tried to source pvc-adaptor pieces that go from small-to large diameters but didn't find much info on it...🙁
Click to expand...

Link go boom!

I can see what you mean, though. Seeing as how these are likely to end up having a custom-built amp, a filter before the amplifier is cake.
 
#17
I would like to design my owm horn from pvc, that's why I'm looking for
a great variety of PVC adaptor pieces...

Thanks for reminding me of the design, don't know if I could have found it again, or would have thought about it in the first place...🙂
 
#18
v-bro said:
I would like to design my owm horn from pvc, that's why I'm looking for
a great variety of PVC adaptor pieces...

Thanks for reminding me of the design, don't know if I could have found it again, or would have thought about it in the first place...🙂
Click to expand...

You might want to consider a different approach.

By filling the tube with plates of 2" insulation foam with holes in the middle of decreasing size, and then glassing the resulting cone, you could get a similar effect, but very cheaply. (A 10' piece of 4" PVC is 16$. A 4"->3" adapter is 6$. And you're going to need quite a few of them.)
 
#19
Other main pvc design-- the one I started out with
is the PVC Periscope located at Full Range Driver Forum.


I ran the design for a while with RS 1197 and then
got adventurous and added another pipe length
so the total was about 81 inches-- about the same
as one of Bill Fitzmaurices tuba designs.

All the fittings are at the local home shop of your choice.
The baffle is a toilet wax ring fitting glued onto a circular
mounting piece


For those tricky bits, a plumbing supply shop should
be able to ID the pieces.

Oh yeah, the Spiral Horn:

http://www3.ocn.ne.jp/~hanbei/eng-rear.html


Looks great but a construction project that always
looked daunting to me.
 
#20
loninappleton said:
Other main pvc design-- the one I started out with
is the PVC Periscope located at Full Range Driver Forum.


I ran the design for a while with RS 1197 and then
got adventurous and added another pipe length
so the total was about 81 inches-- about the same
as one of Bill Fitzmaurices tuba designs.

All the fittings are at the local home shop of your choice.
The baffle is a toilet wax ring fitting glued onto a circular
mounting piece


For those tricky bits, a plumbing supply shop should
be able to ID the pieces.

Oh yeah, the Spiral Horn:

http://www3.ocn.ne.jp/~hanbei/eng-rear.html


Looks great but a construction project that always
looked daunting to me.
Click to expand...

I think that the Periscopes are also tapered TLs. I'm not sure, though - half the images won't load.
 
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