Type of loudspeaker capable of producing very low frequency sound
A rotary woofer is a subwoofer-style loudspeaker which reproduces very low frequency content by using a conventional speaker voice coil's motion to change the pitch (angle) of the blades of an impeller rotating at a constant speed. The pitch of the fan blades is controlled by the audio signal presented to the voice coil, and is able to swing both positive and negative, with respect to a zero pitch spinning blade position. Since the audio amplifier only changes the pitch of the blades, it takes much less power, per dB of generated acoustic sound level, to drive a rotary woofer than to power a conventional subwoofer, which uses a moving electromagnet (voice coil) placed within the field of a stationary permanent magnet to drive a cone which then displaces air. Rotary woofers excel at producing sounds below 20 Hz, below the normal hearing range; when installed in the wall of a sealed room, they can produce audio frequencies below 1 Hz, a static pressure differential, by simply compressing the air in the sealed room.[1]
A rotarywoofer is a subwoofer-style loudspeaker which reproduces very low frequency content by using a conventional speaker voice coil's motion to change...
A rotarywoofer is essentially a fan with blades that constantly change their pitch, allowing them to easily push the air back and forth. Rotary woofers...
Rotary tiller, a motorised cultivator Rotarywoofer, a type of loudspeaker capable of producing very low frequency sound Rotary wing aircraft Rotary International...
reproduction, exotic loudspeaker designs such as transmission line, rotarywoofer, or traditional subwoofer designs can produce low-frequency sounds,...
are lower in frequency than those which can be (optimally) generated by a woofer. The typical frequency range that is covered by a subwoofer is about 20–200 Hz...
loudspeaker, the LFT-3. Another of the company's products is the Thigpen RotaryWoofer. Typical subwoofer products are inefficient at producing desired sound...
Emergency Alert System Fire alarm system Long Range Acoustic Device Rotarywoofer Testing sirens Archived 22 October 2013 at the Wayback Machine, Swiss...
are called woofers, while those for very low bass range are subwoofers. Less common types of drivers are supertweeters and rotarywoofers. The electroacoustic...
choosing a transducer other than the voice coil, such as Bruce Thigpen's rotarywoofer (1974) or Tom Danley's servo-motor subwoofer (1983). Power compression...
and two 5-inch (130 mm) woofers. The unit provides two separate inputs so different instruments can be plugged into the rotary and stationary components...
the fact that the cabinet uses a guitar speaker, instead of a horn and woofer. The effect was dispersed vertically, unlike the Leslie that is dispersed...
testing facility for the “Spine Tingler” [10], a specially designed rotarywoofer that reproduces the subsonic sound spectrum (0 to 20 Hz). Although most...
which contains a woofer for the low frequencies and a horn for the high frequencies. The Leslie horns rotate and a baffle around the woofer rotates as well...
terrorism" (Press release). Syrian Democratic Forces (SDF). 23 October 2018. Woofers (17 October 2018). "The SDF has regularly been reporting @coalition artillery...
frequencies that are too high for the woofer. There are two main types of controls on bass amps: switches and rotary knobs. The simplest, least expensive...
single-disc CD player, a four-speaker front audio system with separate woofers and tweeters, full instrumentation with an integrated driver information...
The foundation of Bozak loudspeaker design was the unique Bozak cone. The woofer cone was molded from a slurry containing paper pulp, lamb's wool and other...
actually the Batwing transformed by Batman) appears equipped with sub-woofers. It is destroyed during the attack on Cloud Cuckoo Land. In The Lego Batman...
treble compression driver, and a rotating baffle beneath a stationary bass woofer. This creates a characteristic sound because of the constantly changing...
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