Baffles for PVC tube TL speakers? Would it work?

Status
Not open for further replies.
Jump to Latest
#21
Thanks Spasticteapot and Loninappleton, very inspiring :worship:

I want to build a couple of loudspeakers on the request of some "neighborhood rebels" who liked my bike-speakers. They want to do some (illegal 😀 ) partying and need speakers that are light enough to run away with when the cops come.

So I thought about making a plaster cast, to make a lot of them quick and easy...:smash: :smash: :smash: :smash: :smash: :smash: :smash:
Got it pretty well figured-out in my head; start with two positive moulds out of soft wood (?), one slightly larger than the other in order to create the "wall-thickness" in the end...
The larger pos.mould will be put in the plaster (surface treated with silicone and grease all the times and casts will be released with compressed air...) and sawed in two halfs (negative moulds). The smaller pos.mould will not be made negative, but will be also sawed in half and placed on small blocks that are as thick as "wall-thickness" in the negative moulds.
I was thinking of using some kind of epoxy and spray it in through a hole in the bottom, than just slide off excess epoxy with a bar (like a bartender smooths the foam on a beer).:drink:
Glue the two halfs together in the end. 😱

I thought of making "wall-thickness" not to bulky a the start and either build it up by glueing small stones on the surface (for in livingrooms) or leave it light and portable..

I than either have the choice of a hifi-driver and a horn out of heavy material (for in livingrooms) or a PA-driver and a horn out of light material ( for outside-use).

For the last one I wonder if anyone has suggestions on a light driver that can really play loud from a 40 watt (at 4 ohms) class D amp?
Preferably a full-range driver...
I was thinking of an 8" or preferably smaller...


Suggestions would be highly appreciated...:angel:
 
#23
That looks like a pretty hifi driver indeed, thanks.

But for PA use I want something really low weight and high eff., I looked at the "neolyte" from "galaxy audio":
http://www.galaxyaudio.com/galaxystore.html
Freq response:
http://www.galaxyaudio.com/IM2/SPLvsFreq.jpg

The only thing that bothers me is the fact that many sources claim it to be 96db/W/m sensitivity. I think the response graph shows differently...🙁

I think it would help if it were just a little bit larger (6 to 8" instead of 5"), just can't find any neodyme 6" or 8" fullrange....
 
#24
Spasticteapot said:


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

James may be having having prob.s at Full range driver forum.

The Periscope is just 4" diam. PVC with an elbow at the top
and I port at the base. I couldn't find it to tell the truth.
The baffle in the origianl design is square and mdf.

Where are you in Wisconsin?
 
#27
Don't place a baffle on the pipe, it will alter the tuning. Try changing the damping material.

I have spent a day and a half playing with a TL. A 3 inch driver sitting on top of 28" of polypipe. I had mine suspended from a camera tripod so I could adjust the distance from the open end to the floor. Ended up with about 2 1/2 inches. The damping ended up being 2 cotton/nylon blend socks (clean from the drawer) and a piece of cotton cloth! Very low tech.

The bass wasn't going to worry the neighbours, but clean down to about 50 hz. Midrange and top end crystal clear. Great transients. And from a 5 watt amp! Midrange ripple barely noticeable.

When I get some more PVC, a pair of these will replace my rear speakers. Then I might start on a sub.

Like all things, TLs are scaleable. What you learn on a little one applies
to a big one. Good luck and experiment.

Geoff
 
#28
Geoff H said:
Don't place a baffle on the pipe, it will alter the tuning. Try changing the damping material.

I have spent a day and a half playing with a TL. A 3 inch driver sitting on top of 28" of polypipe. I had mine suspended from a camera tripod so I could adjust the distance from the open end to the floor. Ended up with about 2 1/2 inches. The damping ended up being 2 cotton/nylon blend socks (clean from the drawer) and a piece of cotton cloth! Very low tech.

The bass wasn't going to worry the neighbours, but clean down to about 50 hz. Midrange and top end crystal clear. Great transients. And from a 5 watt amp! Midrange ripple barely noticeable.

When I get some more PVC, a pair of these will replace my rear speakers. Then I might start on a sub.

Like all things, TLs are scaleable. What you learn on a little one applies
to a big one. Good luck and experiment.

Geoff
Click to expand...


Sounds sweet. What drivers did you use?
 
#29
Hi spasicteapot.

The driver is from a Diamond MM system supplied with Packard Bell PCs in Australia, and I think UK. I have no specs available, only an educated guess at Fr at 130Hz. Originally in a ported plastic enclosure, that resonates all over the place. OK if you don't feed bass into them.
Similar to those used in Altec Lansing ACS54s and ACS45s, though the magnets are smaller.
Altec Lansing use sealed enclosures on their satellites, and are far more rigid.

Many off these types of speakers have decent drivers in crappy plastic housings.

Geoff.
 
Status
Not open for further replies.
Top Bottom