1987 - 2017: Thirtieth Anniversary!
Best viewed in "landscape" mode.
PRO 049 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||8 1/4"|
|B: Hole diameter||7 1/4"|
|C: Total depth||2 3/16"|
|F: Mounting diameter||7 3/4" (8)|
|G: Rabbett depth||5/32"|