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Some Sonotube Help - Speaker Terminals Polyfill

post #1 of 8
Thread Starter 
I need some suggestions for speaker terminals. I prefer to have the terminal on the side of the sonotube itself, vs. on one of the baffles.

I'm tempted to just drill a hole in the tube, run the wire through, and silicone it up. But that seems a bit sloppy to me. Would a standard circular terminal cup seal well enough on a 24" diameter sonotube?

AND

How much polyfill should I use? Should I dump it in or nicely line the walls? I've always just dumped it in the past.

I have 4^3 of space per woofer. 18" Stereo Integrity.
post #2 of 8
Thread Starter 
Would something like this work for binding posts?

http://www.parts-express.com/pe/showdetl.cfm?partnumber=091-1250

I'm not sure I trust the 'cardboard' to not compress from securing these.
post #3 of 8
Yes that will work. I would just line the inside the tube. Just make sure there are no air leaks at the end caps and binding posts.
post #4 of 8
I would glue a small pre drilled piece of wood on the sono where you want the terminals to go.
post #5 of 8
Thread Starter 
Quote:
Originally Posted by steve nn View Post

I would glue a small pre drilled piece of wood on the sono where you want the terminals to go.

For what purpose?

I was thinking fender washers to spread the load and stop compression..... are you thinking the same with your wood idea?
post #6 of 8
Thread Starter 
Quote:
Originally Posted by MKtheater View Post

Yes that will work. I would just line the inside the tube. Just make sure there are no air leaks at the end caps and binding posts.

Thanks for bringing that up. I think that is an important point and one which I will be highlighting in my build thread. Sealing up the baffle joints even though you glued the baffles in.

I just this morning sealed all the joints with a sealant. smile.gif

I would like some more input on lining vs. stuffing the tube with polyfill. It's always been my understanding that filling the enclosure with poly fill will make the box act bigger. I forget the oz per cubic foot. ( I can look it up easily) but it seems that 4^3 is the minimum size for these SI 18's and adding polyfill to make the enclosure seem bigger might be a benefit.
post #7 of 8
Yes washers would work fine, just so they are big enough to dissipate the load.

EDIT/PS> I was just thinking custom PDX thermalnecular terminals is all. smile.gif
Edited by steve nn - 10/4/13 at 7:18am
post #8 of 8
Thread Starter 
I went out to my loudspeaker supply shop locally and ended up getting speakon terminals for the sonotube.

http://www.parts-express.com/pe/showdetl.cfm?partnumber=092-339

I also got all the other speakon connectors for the amps. and tubes.

If anyone else has any input on how much polyfill to use I'd love to hear it. smile.gif
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