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Valves continue to be used in some high-power, high-frequency amplifiers used for short wave broadcasting, VHF and UHF TV and (VHF) FM radio, also in existing "radar, countermeasures equipment, or communications equipment" [7] using specially designed valves, such as the klystron, gyrotron, traveling-wave tube, and crossed-field amplifier ...
Carver's U.S. patent 4,218,660, first applied in his model M400 power amplifier, describes a power supply whose input switches on and off at an ultrasonic rate to adapt to the varying power demand of the amplifier. The innovation is in the power supply, not the amplification circuitry, and in the use of switching, not in the use of a coil or coils.
An early use of class-D amplifiers was high-power subwoofer amplifiers in cars. Because subwoofers are generally limited to a bandwidth of no higher than 150 Hz, switching speed for the amplifier does not have to be as high as for a full range amplifier, allowing simpler designs. Class-D amplifiers for driving subwoofers are relatively ...
Small high amplifier power system: 2 high amplifier power-rated mid/high frequency PA speakers with 15-inch woofers and a large horn-loaded tweeter; two high amplifier power-rated subwoofer cabinets with one or two 18-inch subwoofer cabs (front-firing, also known as "front loaded", or manifold-loaded subwoofer cabinets)
Wachner co-wrote a paper for the Audio Engineering Society (AES) in 1975, addressing the problem of differing power claims in the amplifier industry and the hope that power rating standards set by the Federal Trade Commission would narrow the 'credibility gap'. [1] BGW introduced an audio crossover product in 1979 and new amplifier lines in '80 ...
The TNT Series bass amplifier first entered the market in the late 1970s as a 45-watt combo with one 15-inch speaker. The high-power TNT bass amplifier series was introduced as a 150–200 watt bass combo primarily equipped with a Scorpion or Black Widow 15-inch woofer.
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