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Open back cabinet


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Hi everyone, I’m trying to work out the science (if any) behind Dumble’s fabled open back / ported 2x12” guitar amplifier cabinet (see image).
 

Can anyone tell me what affect the port would have on the rear-radiated waveform in terms of resonance and directivity? @davewantsmoore any ideas?

 

I’m looking to add one to a pre-existing cabinet I built and would love to know if there is a calculation that can be performed to optimise the size of the hole. 

For reference, the speakers would have most likely been EVM12Ls or Celestion G12-65s. 

 

 Cheers, Tom
 

 

IMG_2133.webp

Edited by tombeardsworth
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