tombeardsworth Posted July 14, 2024 Posted July 14, 2024 (edited) 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 Edited July 17, 2024 by tombeardsworth
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