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Forum topic by Sirgreggins posted 05-21-2012 05:37 PM 3544 views 0 times favorited 21 replies Add to Favorites Watch
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Sirgreggins

298 posts in 1695 days


05-21-2012 05:37 PM

A friend of mine wants me to help him build an enclosure for his guitar amp so it’s eaiser to move. It’ll be on heavy duty casters. I think we’re just gonna use birch or maple ply and add some solid wood reinforcement so the shelf the am will sit on doesn’t sag. All the joints will be half laps. Would you use titebond II for the glue up or epoxy? I have titebond already. Should we use silicone sealer on the inside to help with vibration? We’re gonna do bondo on the outside like you would with a subwoofer enclosure. Any ideas/ constructive criticism and help is much appreciated. Thanks guys


21 replies so far

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Bill White

4448 posts in 3420 days


#1 posted 05-21-2012 06:05 PM

Amp or amp/speaker enclosure? Will it be a “reflex” enclosure?
Titebond should be just fine. If using as a speaker box, the silicone will help on the vibe issue. I have used hot melt for the same application.
I don’t understand the bondo application. What does it do? My old Fender Bassman amp (4 10” speakers) didn’t have any bondo.
Bill

-- bill@magraphics.us

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Sirgreggins

298 posts in 1695 days


#2 posted 05-21-2012 06:18 PM

It is an amp enclosure. he has a Marshall amp. We were going to do bondo instead of carpeting material you’re used to seeing. He has some bondo left over from a subwoofer project a while back. Figured we’d use it

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AMC

37 posts in 2041 days


#3 posted 05-21-2012 08:37 PM

Hard to grasp what your actually doing Sir, is this one of those Marshall guitar heads, like 30” wide, and about 9” tall? Or a box that contains speakers and amplification?

-- Making the best of what I have!

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Sirgreggins

298 posts in 1695 days


#4 posted 05-21-2012 08:47 PM

This will be a head that holds the amp. Just a ply wood box with a shelf. The shelf will have the amp sitting on it an will be open on the back and front for sound to come out. Under the shelf it will be to house pedal boards and stuff like that. The enclosure will not be for anything other than storage. Basically a mobile base for the amp and a place to store stuff while it’s being moved. Sorry if this sound more confusing than it is.

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knotscott

7207 posts in 2835 days


#5 posted 05-21-2012 10:58 PM

I’m a little confused. If sound is coming out, it means there’s a speaker in addition to an amp…an amp needs a speaker to actually produce the amplified sound, in which case you’ll want to brush up on things work best for electric guitar sound….there are very different principles for guitar speakers than for high end hi-fi speakers. A wise seasoned veteran once told me that wide old growth pine is very desirable for guitar speaker cabinets as a tone wood.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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Sirgreggins

298 posts in 1695 days


#6 posted 05-22-2012 01:53 AM

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AMC

37 posts in 2041 days


#7 posted 05-22-2012 02:29 AM

OK, now we get it!

What you are talking about building is called a flight case. There are several interesting commercial designs available to get some ideas from. Don’t worry about things like, what kind of glue or wood, this should not affect the sound. Baltic birch ply, in 1/2 inch would be the standard.

Look at these for inspiration…

-- Making the best of what I have!

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knotscott

7207 posts in 2835 days


#8 posted 05-22-2012 03:08 AM

There’s definitely a speaker inside….

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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Rick M

7903 posts in 1840 days


#9 posted 05-22-2012 03:17 AM

I still don’t see the point of using bondo or silicone. It is not a speaker cab, it’s a flight case, meant to protect the amp & head while in transport.
http://en.wikipedia.org/wiki/Flightcase

-- http://thewoodknack.blogspot.com/

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AMC

37 posts in 2041 days


#10 posted 05-22-2012 03:45 AM

the point of the bondo is to smooth and fill all the edges for a nice painted finish.

-- Making the best of what I have!

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Rick M

7903 posts in 1840 days


#11 posted 05-22-2012 07:32 AM

Well I’ve been reading off and on about building subs for years and never heard of using bondo until today. I don’t see the point if you’re building from MDF, maybe if you don’t have a saw to miter the corners, but whatever. I wouldn’t want to use bondo on a flight case designed to take bumps and bruises instead of your gear; and I still don’t see the point of silicone.

-- http://thewoodknack.blogspot.com/

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Sirgreggins

298 posts in 1695 days


#12 posted 05-22-2012 01:08 PM

Thanks everyone. I appreciate all the help. Sorry for all the confusion

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AMC

37 posts in 2041 days


#13 posted 05-22-2012 02:34 PM

If you are planning on a painted enclosure, you will need something to fill small gaps and end grain (even MDF has end grain of sorts) Nothing works better then bondo for such a job. It is widely used among speaker builders, and I use it anywhere I need fill and I am planning to paint, it is vastly superior to common wood fillers. The edges of his box will be plywood, and even good baltic birch ply needs considerable care if your going to paint it.

There is an interesting blog post on the parts express forum about how one person used it in a few different ways to keep painted MDF cabs from showing their joint lines after a couple of seasons. Even ‘perfect’ MDF cabs will show their lines after a few temperature / humidity cycles. Obviously this is less of a problem if you are going to veneer you box, but it still can be a problem.

-- Making the best of what I have!

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Sirgreggins

298 posts in 1695 days


#14 posted 05-22-2012 02:38 PM

I built a speaker box for my friends car and used bondo on the outside. I just wasn’t sure if there was anything special i needed to address with this project.

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AMC

37 posts in 2041 days


#15 posted 05-22-2012 02:47 PM

Not really, it’s just a case for a speaker, so you can’t really screw it up. I would however consider using some sort of edge material, for protection. Bondo has no sound improving qualities, it’s just for cosmetics.

All the extruded aluminum parts you see on the pictures is available from on-line sources, if you like that look. You can also get the spring loaded handles, corner pieces, etc, too give it a nice finished look.

-- Making the best of what I have!

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