Building a 2x12 cab

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Colton
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Building a 2x12 cab

Post by Colton »

This bandmaster is way too big to lug around, so I'm gonna build a new 2x12 cab I can use the bandmaster head with. I don't really know much about the technical stuff, about how big should the box be, should it be sealed, ported, or open backed, anything like that.

Who's our box tech?
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VENTGtr
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Post by VENTGtr »

Colton,

There are a ton of things to consider. Do you want a closed back, what kind of
wood is going to work for the sound you wants, etc.

I've been using a Lopo 2x12 for awhile now and it's great, BUT it does project
the sound mightily (If you want to save yourself time and hassle, look on EBay,
or Lopoline.com and get one from them).

In trying to keep backling volume down, last week I went to using a 1x12 again
and was extremely happy with it.

ANYWAY, high grade 11ply can work very well (Lopos are actually 13 ply Baltic
Birch), dimensions of 15" high x 14" deep x 27" long, weigh a little over 30lbs.

You CAN also build one that's convertible, which is a good idea. Can take the
back off, leave it, whichever works best for wherever you are.

Your bandmaster probably has either Jensens or Oxfords, right? So if you
like how they react in the Bandmaster (Closed back, if I'm thinking right) take
that into consideration.

Open-back are a lot easier since the sound dispersal is different and the cab
materials aren't such an ingrained part of what's coming out the front.

For either, Southern Pine has been a common choice (I built a 10x12 open
back cab out of it a few years ago and it was great).

Check out what you'll be paying in whatever grade wood, tolex, grill cloth,
corners, baffle board (7-10 high grade ply, especially with a closed back),
jacks, etc., etc. and you might find it's just cheaper to pick up a Lopo, Avatar,
or something else.

Granted, it's a lot of fun to build them and not a huge time-consumer (If you
have something that easily cuts dado joints, use it), but there are companies
that do it pretty well at a reasonable cost.

BUT, as for specs for a closed back:

11-13 Ply Baltic Birch Ply or good Southern Pine
15" high x 14" deep x 27" long
7 to 10 Ply Baffle
And BE SURE TO PUT ON CASTERS.
Last edited by VENTGtr on Wednesday Nov 19, 2008, edited 1 time in total.
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lonewolf
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Post by lonewolf »

What head do you want to put on it?
Do you want it vertical or horizontal?
single or dual-chamber? (dual is best for lows)
angled top? (not good for lows)

Aside from that, there's not much to a 2-12" cab.

My personal favorite design is the small version Fender Bassman with separate chambers and the speakers are rear loaded to the baffle. You would probably want something Fender style, with pine instead of plywood.

The outside dimensions are 32" x 11-1/4" x 20". You would need:

Two 1"x12"x6' #1 pine boards
1/2 sheet of 3/4" plywood (3' x 4' piece will do--for baffle & rear panel)
screws & glue
2 yards of tolex
1 yard of speaker grill cloth

Table saw with dado blades for making finger joints.
Router to round off corners

OR you could get a super quality bassman cab done fender style by these guys for $226 unloaded (I have one and love it):

https://www.mojomusicalsupply.com/item. ... id=4000115

Very important: The price goes way down when you register and log in with them.
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