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Old 24th October 2006, 11:25 PM   #1
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Default Baffles for PVC tube TL speakers? Would it work?

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?
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Old 26th October 2006, 01:39 AM   #2
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Anybody?
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Old 26th October 2006, 02:05 AM   #3
v-bro is offline v-bro  Netherlands
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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...
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Old 26th October 2006, 02:06 AM   #4
v-bro is offline v-bro  Netherlands
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oops:
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File Type: jpg bike speakers.jpg (70.6 KB, 749 views)
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Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
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Old 26th October 2006, 02:07 AM   #5
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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.
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Old 26th October 2006, 02:29 AM   #6
v-bro is offline v-bro  Netherlands
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They mostly require a lot of eq-ing too....
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Old 26th October 2006, 04:01 AM   #7
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Quote:
Originally posted by v-bro
They mostly require a lot of eq-ing too....
An oval-shaped baffle will boost the sound from about 100hz to about 3 khz. I think that this should help fix the baffle step loss.

Also, the design will be quite snazzy; I'm using clear acrylic, after all.
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Old 26th October 2006, 01:03 PM   #8
Dumbass is offline Dumbass  British Antarctic Territory
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Quote:
Originally posted by Spasticteapot
For the sake of my sanity, my first speaker project (that should actually work)
This implies that you've tried other projects that don't work?
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Old 26th October 2006, 01:16 PM   #9
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Quote:
Originally posted by Dumbass
This implies that you've tried other projects that don't work?

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.
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Old 26th October 2006, 06:02 PM   #10
v-bro is offline v-bro  Netherlands
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You might want to add an extra driver and cabinet and DO very simply filter (first or second order lowpass "pllxo" or "loudspeaker filter") the higher octaves out...
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