Building 1x12 Marshall box type 1931B

guitarman555

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I wanna build my copy of 1x12 Marshall box 1931 B for my greenback (G12H -T 1217 from 1972) i. I have my first greenback (also G12H -T 1217 from 1972) installed into 1x12 1931 A box and sounds great. I wanna have two 1x12 boxes. It is great for versatility (small gigs only one box, bigger gix both boxes). Do you have any typs, about measurment, material, thickness of walls? I have 8 mm plywood (to front I would buy 15 mm plywood)? Do you think it could be enough thick? I measured on my original 1931A box thickness 13 mm everywhere + cca 2 mm tolex. And how about grill? Also, 1931 box has a plank across the speaker in front (it serves for holding Marshall logo - I am thinking if to copy even this or if it will perhaps sound better without this). I am not sure what is the material in front, it is taugher material than on fender amps. Amp that I use is Marshall PA20 from 1972. Thanks for any advices.
 

papagayo

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Hi, the front panel and rear panel must be strong with 22mm thickness. If you don' t want rolling low prequencies and if you want punch basses.
If the rear and front wood are thin there will be vibrations destroying the sound.
 

Decadent Dan

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Go with the measurements if you want to copy it.
I would probably oversize it and close the back but that’s just me.
The wood supporting the logo is also a “beam blocker”. You might want to look that up and see if it’s something you want or not.
Good luck.

Check out some Marshall type cab dimensions and materials here: https://guitarcabinetsdirect.com/cat/cabinets/marshall-style-cabinets/
 
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