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Passive membrane for bass reflex speakers:

Advantages of the passive membrane over bass reflex tubes:

  • No pipe resonance or flow noise
  • No leakage of midtone components from the opening
  • volume saving
  • More options in the vote

The disadvantages are mostly of a theoretical nature, such as poorer group delay (negligible in space) and, of course, the higher acquisition costs compared to the Bass Reflexrores.