Sub box build tips and tricks - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 9 Old 02-11-15, 10:28 AM Thread Starter
Shackster
 
Join Date: Sep 2014
Location: Grand Forks ND
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Sub box build tips and tricks

Ok guys doing a basic 4 cube box for a SI HT18 and want to see what everyone does for tips and tricks when building their boxes. So let me start of with, I like to use fiberglass resin on the inside of the box at the joints for a 100% seal and joint re-enforcement.
What do you guys do?
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post #2 of 9 Old 02-11-15, 10:42 AM
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Steeve B.
 
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Ideally I cut, screw and glue the top, side and bottom together. I usually cut my top and bottom slightly wider and glue/screw them over the side. I then use a router with a flush trim bit to make them perfectly flush. I do the same for the rear panel and the baffle. I brace a lot and use some silicone or other stuff similar to seal it. Wait a good 24-48 hour before installing the driver so the silicone fune don't attack the driver glue.

I adjust my saw table once and do all my same width cut to make sure they are all identical. Using a circular saw home made "track saw style guide" and a speed square I cut my lenght.

If you don't have a Jasper jig for circle just buy a piece of Polycarbonate from your local hardware store cutting center and make one out of it. Perfect circle every time.
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post #3 of 9 Old 02-11-15, 11:03 AM
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Wayne Myers
 
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Re: Sub box build tips and tricks

Not a speaker builder guy here, but have worked a lot with resins. Some heat - heat lamp? - helps it cure faster AND STRONGER, more complex molecular intertwining or something like that.
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post #4 of 9 Old 02-11-15, 11:08 AM Thread Starter
Shackster
 
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Re: Sub box build tips and tricks

That's interesting I've heard it didn't help to apply heat to resin.
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post #5 of 9 Old 02-11-15, 02:05 PM
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Wayne Myers
 
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Re: Sub box build tips and tricks

Again, I do not claim to be an expert here, but I did study a bit about epoxy and resins in general for a project a few years back and read several places that it can make a significant difference. Conversely, curing time and strength can be lengthened and degraded in a cold environment.

They are pretty strong either way, it might not make a meaningful difference for this application. Just throwing the idea out there.
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post #6 of 9 Old 02-11-15, 02:08 PM Thread Starter
Shackster
 
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Re: Sub box build tips and tricks

Oh defiantly not trying to negate what you are saying and I believe you as you have studied it way more than I lol.
Ok throwing this out, binding posts or speaker wire cups? In the car audio world you see a ton of people fitting with cups instead of using binding posts. So what is everyone's thoughts there.
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post #7 of 9 Old 02-17-15, 05:03 PM
Shackster
 
Join Date: Feb 2015
Location: Boston
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My System
Re: Sub box build tips and tricks

I like to use fiberglass for installs in tight spaces in cars. It really lets you use the most of your airspace and tuck it in tight. It's a huge pain in the neck compared to a simple mdf box, but it looks so much better and saves a ton of cargo space.
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post #8 of 9 Old 02-20-15, 12:48 PM Thread Starter
Shackster
 
Join Date: Sep 2014
Location: Grand Forks ND
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Re: Sub box build tips and tricks

So what is everyone's thought about enclosure finishing? I might be doing a carbon fiber vinyl wrap for a coworker, but he also brought up using a veneer. Do veneers wrap over roundovers as well as vinyl does?
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post #9 of 9 Old 03-08-15, 08:28 PM
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Re: Sub box build tips and tricks

For enclosure constructioin , I always use a glue & screw approach;
the glue also acts as a first line of defence in sealing.
To seal the insides , I have used automotive 'sound deadening',
and concentrated the spray on the inner corner joints.
Finally , 'T' nuts make sure that you speaker mounting hole never get
stripped - out.
Then cover the box with various materials depending on usage.
I have rolled on DuraLiner for DJ cabinets because it is tough.
.
Some wood vaneers have a hot - melt glue backing that covers screws
good; They don't want to bend around too sharp , or small radius.
..
From my experience making DJ cabinets , I have become a big fan
of Peavey's binding cups -- used with either Neutrik or
Switchcraft connectors ; also G&H make nice 1/4 inch speaker cable
connectors -- the black housing with gold plated connections are
very nice.
...
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