Often called a "drone cone." A diaphragm with a suspension but no motor assembly. Passive radiators can be substituted for a vent or port in a speaker.
A diaphragm (either a drone cone that looks similar to a woofer or a flat plate) that reinforces the woofer's bass output; acoustically similar to a port. Also see: Bass Reflex.)
A speaker design that uses changes in internal air pressure to drive a second, passive drive unit
A radiating surface (usually similar to a conventional speaker cone) that is not electrically driven but shares the same air space in a sealed cabinet with an electrically driven loudspeaker. This arrangement is functionally similar to a loudspeaker with a vented (ported) cabinet, with the passive radiator serving the duties of the air in the port.
Also called drone cone. A nonpowered bass driver. Passive-radiator drivers are often employed and behave as independent bass speakers below the resonance of the active drivers. See also Bass reflex.
A device that looks just like an ordinary driver, except it has no magnet or voice coil. A passive radiator is usually a highly compliant device, with a similar cone material and surround found on regular active drivers. The radiator must usually be at least as large (or larger) than the driver it is aligned with. The passive radiator is tuned to Fb and used in place of a port.
A diaphragm mounted on the surface of a speaker enclosure and driven by the sound pressure created by the active driver within the cabinet rather than electrically with a voice coil. A passive radiator performs a function similar to a port.
An undriven loudspeaker cone that is mounted in a bass-reflex (sealed) enclosure with other speakers.
Often called a "drone cone." A speaker with no motor assembly that resonates in response to a driven speaker in an enclosure. Passive radiators act very much like a vent or port in a speaker.
A passive radiator or parasitic element is a radio antenna element which does not have any wired input. Instead, it absorbs radio waves radiated from another active antenna element in proximity, and re-radiates it in phase with the active element so that it adds to the total transmitted signal. This will change the antenna pattern and beam width.
A speaker enclosure that utilises a passive radiator usually contains an "active" or the main driver and a "passive" driver (or drone or radiator). The active driver is a regular loudspeaker, and the passive is more or less the same, but without the coil. It is only a cone, not connected to any coil or electrical circuit.