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1987 - 2017: Thirtieth Anniversary!
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PRO 023 Passive Radiator
$NLA each

Passive radiators are used when designing a vented system, to get around the disadvantages of port tubes. Typically a passive radiator is chosen with a larger area than the woofer (or combined area of the woofers), since at very low frequencies the passive needs to move a lot of air.

Passive radiators are tuned by mass loading. When I sell them for DIY projects, I leave off the dust cap so it can be attached after the desired mass is determined and glued to the apex of the cone.

  A: Outer diameter   12 1/4"
B: Hole diameter11 1/8"
C: Total depth3 3/8"
F: Mounting dia.11 5/8" (8)
G: Rabbett depth5/32"

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