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clarification on BDA construction drawings

Singingotter

Posts: 5

February 11, 2022 - 8:43 am

Is it perforated or unperforated hardboard in the BDA?
The drawing description states ‘Pegboard’, but the graphic shows a solid unperforated hardboard.
Elsewhere Dennis has stated “… it’s a sealed unit so we don’t have any slits, we don’t
have any holes.” (Sound waves vs Sound rays), but I thought this was referring to the sealed nature of the cabinet.
TIA

Dennis Foley

Posts: 629

February 14, 2022 - 6:57 am

With the BDA build you are building a perforated absorber and inserting it inside a diaphragmatic absorber . With a perforated absorber , you must have air flow. Pegboard in the states will provide the density required for the front wall”membrane” with holes that are 1/4″ in diameter and 1″ on center.