Bass reflex
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A bass reflex system is a type of loudspeaker enclosure that uses a port or vent cut into the cabinet and a section of tubing or pipe affixed to the port. This port enables the sound from the rear sid
RCA bass reflex shelf stereo speakers.
Two-inch port tube installed in the top of a Polk S10 speaker cabinet as part of a DIY audio project. This port is flared.
A small JVC speaker with a port.
A small Keesonic Kub speaker. With the front grille removed, the port is visible between the two drivers.
Passive radiator (speaker)
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A speaker enclosure using a passive radiator usually contains an "active loudspeaker", and a passive radiator. The active loudspeaker is a normal driver, and the passive radiator is of similar constru
Bass reflex
…in a band of frequencies centered around the tuning frequency, reducing distortion in that frequency range. Ported cabinet systems are cheaper than a passive radiator speaker with the same performance; whereas a passive radiator system requires one or two "drone cone" speakers, a ported system requires only a hole…
A small computer speaker cabinet. The middle speaker is a real loudspeaker. The top and bottom cones are passive radiators.