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PAE will be very similar to efficiency when the gain of the amplifier is sufficiently high. But if the amplifier gain is relatively low the amount of power that is needed to drive the input of the amplifier should be considered in a metric that measures the efficiency of said amplifier.
Earth Sound Research specialized in electric bass and guitar amplifiers in the 1970s. [3] They also manufactured PA mixers, power amps, [4] and stand alone solid state reverb units. The company also manufactured ESR brand distortion pedals such as the Graphic Fuzz which was based somewhat on a Craig Anderton fuzz and volume pedal. [1]
All the amplifiers were housed in smart slim carryable heads and 2 x 12 or 1 x 15 combo enclosures. Many new PA speaker cabinets were designed and put into production, such as the 212 & 412 Dual Concentric, 212BL, 215BL, 412BL, 115PA Radial Horns and Bass Bin + Piezo plus the Concert Series of pro PA systems. A large range of studio and live ...
The 400 BH power amp module was used in a range of bass amps during the early 1980s, commencing with the MKIII Bass Head in 1979. The MKIV Bass Amp head unit, introduced in 1981, offers a range of functions. It is air cooled, features protection circuitry, and is capable of around 300/350 watts RMS safely into 2 ohms.
Quad 33 pre-amplifier Quad II power amplifier. Following the mass production of 'stereo' vinyl records in 1958, the QC 22 control unit was developed and released in 1959. [3] This was a stereo control unit that was designed to be used with a pair of QUAD II mono power amplifiers.
A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.