I need help selecting materials for a guitar amp iso box!

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Aksen

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----------- Background (you don't have to read this part) -----------

I am still in the planning/learning stages here, so any information will probably help me out quite a bit

First off, I love homebuilt projects because of the satisfaction of success, the things that you learn, and i like to SAVE MONEY. Second, I haven't really seen any plans online that suit my needs. Allow me to explain:

I am a part of the San Francisco Bay DIY punk/indie/hardcore scene. I don't have a place of my own to record in, but I have some decent gear. Most bands I'm involved with wouldn't mind being recorded in their own practice space, so basically I just bring over my stuff in a truck, set up on a folding table and do what I do. It's sort of a dirty way to do things, but the bands don't want "glistening" recordings so it works well. Basically, once I get these iso cabs I can put out ads and charge ~$100 or less for a full day's session.

The biggest hurdle is that bands want to be recorded playing all live, all at the same time. Layering is time consuming and the music ends up sounding ... unenthused. So I want to build three isolation chambers for combo amplifiers. I suppose the isolation doesn't have to be perfect, but I want to get as much as possible.

----------- /End background -----------

Goals:

1.) Build iso boxes so I can record a 4 piece band all at once, without sound pressure from amplifiers messing with the drum mic diaphragms, etc.
2.) 3 isolation boxes, each big enough for a combo amp and a close mic.
3.) Try to keep the cost below $150 ea.
4.) Sturdy enough to be portable.
5.) Handles. Casters?

I have been looking at different materials, and I am trying to figure out the best combination of layers. These are the materials I've come up with:

1.) MDF (1/2" or 5/8")
2.) Soundboard particleboard (1/2" or 5/8")
3.) Polystyrene? (it's like styrofoam) (1"+)
4.) Carpet insulation?
5.) I have a lot of sound treatment foam for the inside.
6.) can't use sheetrock because this needs to be portable!

At first I thought the best order of layers was this:
Inside ------------- Outside
[Soundboard] -> [Polystyrene] -> [MDF]


But then I did more reading about Polystyrene and people said it really doesn't help in the sound isolation process, and I also learned that soundboard is designed to be GLUED to sheetrock or somethin. So as of right now, I'm thinking of this order:
Inside ------------- Outside
[MDF (1/2")] -> [Glue] -> [Soundboard] -> [No glue?] -> [MDF (5/8")]




Other notes:
*I am still considering a layer of Polystyrene on the floor of the box, to help eliminate the amplifier's vibrations.

*What's the best way to do a door? I think that the simplest approach is to have one side of the box be detachable. I could fasten it with latches, and use weather stripping for an airtight seal.

*Casters. I think these things will way a ton, and having them on casters would help. If there are any cons to this, bring em up. I feel like there's something I'm not considering.


Alright. Please let me know what I'm doing right, what I'm doing wrong. I have a month or so before I'm going to go through with it.
 
This is what i'd do: screw pieces of MDF with material covered rigid fiberglass together in a box(leaving 1 side for a door), glue rigid fiber glass to the other side from the material covered sides then build an outer layer of MDF around it. on the inner one have a removable door(not on a hinge), and the outer have a hinged door. Before you door all this though, you want to get all the plugs and sockets etc into place as shown on the diagram(don't need to be in those exact places). On the inside install 2 mini superchunk bass traps as shown.
 

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WHat about heat concerns?

Wont putting your amp in a little space with little or no vent's make for a burnt up amp?

Just a thought.

-Blaze
 
pandamonk said:
This is what i'd do: screw pieces of MDF with material covered rigid fiberglass together in a box(leaving 1 side for a door), glue rigid fiber glass to the other side from the material covered sides then build an outer layer of MDF around it. on the inner one have a removable door(not on a hinge), and the outer have a hinged door. Before you door all this though, you want to get all the plugs and sockets etc into place as shown on the diagram(don't need to be in those exact places). On the inside install 2 mini superchunk bass traps as shown.

Oh sweet, this is exactly what I was looking for! Tonight I'll do some reading on fiberglass, because that's something I don't know much about.

Did you draw these up, or did you find them somewhere? If you drew them, thank you very much! If you found them somewhere else, could you link me so I might find more information?

Also, do you have experience with this yourself? Is Blaze right about the burnt amp?

blazingstrings said:
WHat about heat concerns?

Wont putting your amp in a little space with little or no vent's make for a burnt up amp?

Just a thought.

-Blaze

Damn, I hadn't thought about that. Maybe that's why a lot of people have speakers built in to their boxes? I might have to go that route. Might be able to make the things smaller if there's a built in speaker.

Thank you guys for the time.
 
Aksen said:
Did you draw these up, or did you find them somewhere? If you drew them, thank you very much! If you found them somewhere else, could you link me so I might find more information?

Also, do you have experience with this yourself? Is Blaze right about the burnt amp?
Yeah i drew them. I don't have experience with it myself, but do see that it could become an issue. I think it could be easily sorted though, with small fans such as computer fans or whatever. But obviously installing fans as ventilation will cause a drop in transmission loss, unless done properly. I'll leave it for someone else to explain this, because i am unsure.
 
Aksen said:
Damn, I hadn't thought about that. Maybe that's why a lot of people have speakers built in to their boxes? I might have to go that route. Might be able to make the things smaller if there's a built in speaker.

If you have a amp with head/cab then just put the head on top of the amp, put another 1/4'' cable that goes inside of the box, there you go, no heat problem and you won't have to open it to adjust anything.


-jeffrey
 
OhSh1rt said:
If you have a amp with head/cab then just put the head on top of the amp, put another 1/4'' cable that goes inside of the box, there you go, no heat problem and you won't have to open it to adjust anything.


-jeffrey

sweet!.....
 
yeah I plan on buying a 1X12" cab for my amp so I can do this. I don't have any experience with DIY projects. Is this something that's going to be beyond me or is it pretty easy to do? Do you know of any I can purchase? Doesn't have to be big at all. Just so it can fit the cab and two mics.
 
ericlingus said:
yeah I plan on buying a 1X12" cab for my amp so I can do this. I don't have any experience with DIY projects. Is this something that's going to be beyond me or is it pretty easy to do? Do you know of any I can purchase? Doesn't have to be big at all. Just so it can fit the cab and two mics.

Chances are its going to be dificult, hopefuly you have the right tools, especialy a table saw the right size, you defintly want to get metal corners for it

that's all I can really offer, all the projects ive done have been way harder than I realized (building a studio/pa speakers) but I never drew plans.


-jeffrey
 
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