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A bass amp head used with two speaker cabs, with each cabinet containing two loudspeakers and a high frequency horn. Bass amplifier equipment manufacturers include a variety of different types of companies, ranging from companies that only make individual components to companies that only make bass amplifiers and loudspeakers (e.g., Gallien ...
Kustom 200 B-4 amplifier in black Naugahyde, purchased new in 1972. Kustom 200 Bass Amplifier, 100 watts RMS, two 15" speakers, cascade sparkle, 1971. Kustom Amplification or Kustom Electronics is a manufacturer of guitar and bass amplifiers and PA equipment and accessories.
At 85 lb (39 kg), the Ampeg SVT provided 300 watts of RMS power, considerably more than most other bass amplifiers of the era. The high power rating made the SVT a candidate for use in larger venues. The SVT saw widespread use by rock acts in the 1970s and is still considered by many to be the world standard reference bass amp.
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.
These enclosures are sensitive to small variations in driver characteristics and require special quality control concern for uniform performance across a production run. Bass ports are widely used in subwoofers for PA systems and sound reinforcement systems, in bass amp speaker cabinets and in keyboard amp speaker cabinets.
The bridge mode option is often used in PA systems and especially in car audio applications to feed bass loudspeakers at high power. Car audio amplifiers commonly have only a notional 13.8 volt supply, which would ordinarily limit the voltage swing available at the output to + and − 6.9 volts.