1987 - 2017: Thirtieth Anniversary!
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PRO 023 Passive Radiator
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 diameter||11 1/8"|
|C: Total depth||3 3/8"|
|F: Mounting dia.||11 5/8" (8)|
|G: Rabbett depth||5/32"|
7 Kelsey Road, Lee, New Hampshire 03861