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JL Audio acquires Total Mobile Audio as an entry-level line to its dealers. [4] In 2004, JL Audio enters the home audio market with the Fathom and Gotham powered subwoofer systems. These feature variants of the W7 subwoofers, which are powered by JL Audio's amplifier designs combined with A.R.O. (Automatic Room Optimization) circuitry.
Since the audio amplifier only changes the pitch of the blades, it takes much less power for a given sound level to drive a rotary woofer than a conventional subwoofer, which uses a moving electromagnet (voice coil) placed within the field of a stationary permanent magnet to move a diaphragm to displace air. Rotary woofers excel at producing ...
From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...
Sundown is Canadian singer Gordon Lightfoot's ninth studio album, released in 1974 on the Reprise Records label. It was the only Lightfoot album to reach No. 1 on the pop chart in the US. In his native Canada, it topped the RPM 100 for five consecutive weeks, first hitting No. 1 on June 22, 1974, the same day it reached the top of the chart ...
"Sundown" is a song by Canadian folk artist Gordon Lightfoot, from the titular album, released as a single in March 1974. "Sundown" reached No. 1 on the U.S. Billboard Hot 100 and easy listening charts [ 2 ] and No. 13 on the Hot Country singles chart, [ 3 ] as well as No. 1 in Canada on RPM ' s national singles chart .
Early speaker from Vega Labs. Cerwin-Vega was founded as Vega Associates [4] (with later name changes to Vega Laboratories and then Cerwin-Vega) by aerospace engineer Eugene J. "Gene" Czerwinski (1927–2010) in 1954, [4] and became noted for producing an 18" speaker capable of producing 130 dB in SPL at 30 Hz, an astonishing level during its time.