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Diver telephone c.1911. The original communication between diver and surface attendant was by pulls on the diver's lifeline. [11] Later, a speaking tube system, patented by Louis Denayrouze in 1874, was tried; this used a second hose with a diaphragm sealing each end to transmit sound, [12] but it was not very successful. [13]
New mounting brackets allow the newly designed speakers to mount nearly flush to the wall. [ 37 ] In the past, Bose has manufactured a 6.1-channel Acoustimass system, the Acoustimass 16, which featured five "double cube" satellite speakers, a single center-channel speaker, and an Acoustimass bass module.
Slightly smaller than the SB-1, the SB-2 uses 28 4-inch (102 mm) drivers arrayed on the surface of the parabola combined with a coaxial horn with a 2-inch (51 mm) throat and a 4-inch (102 mm) voice coil. Similar to the SB-1, the SB-2 preserves pattern control from 500 Hz up to 16 kHz, with a 20° angle of dispersion, complemented by more widely ...
1947 – JBL has a 15" speaker (38 cm), model D-130, using for the first time a 4" (100 mm) voice coil in a speaker cone; 1949 – James. B. Lansing dies of suicide; William Thomas became president of the company; 1954 – The 375 compression engine is the first 4-inch engine sold; its response extends to 9 kHz
Bass reflex enclosure schematic (cross-section). RCA bass reflex shelf stereo speakers.. A bass reflex system (also known as a ported, vented box or reflex port) is a type of loudspeaker enclosure that uses a port (hole) or vent cut into the cabinet and a section of tubing or pipe affixed to the port.
Soundbug transmits the audio signal to the flat surface by way of a small piece of Terfenol-D, which is a magnetostrictive alloy of rare earth metals and iron. This material, when stimulated with an electrical input, causes the Terfenol to expand slightly, resulting in sound output with a very small amplitude.
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