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2. Power amplifier classes - Wikipedia

   en.wikipedia.org/wiki/Power_amplifier_classes

   When Class-B amplifiers amplify the signal with two active devices, each operates over one half of the cycle. Efficiency is much improved over class-A amplifiers. [14] Class-B amplifiers are also favoured in battery-operated devices, such as transistor radios. Class B has a maximum theoretical efficiency of π/4 (≈ 78.5%). [15]

3. BGW Systems - Wikipedia

   en.wikipedia.org/wiki/BGW_Systems

   The subwoofer contained four 15" drivers, crossover circuitry, and an internal amplifier based on the Grand Touring series design. [6] THX quality assurance also approved the BGW M1100 subwoofer (basically half of an M2200) in 1995 and the Millennium amplifier line in 1996.

4. Subwoofer - Wikipedia

   en.wikipedia.org/wiki/Subwoofer

   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)

5. Amplifier figures of merit - Wikipedia

   en.wikipedia.org/wiki/Amplifier_figures_of_merit

   Modern Class AB amplifiers commonly have peak efficiencies between 30 and 55% in audio systems and 50-70% in radio frequency systems with a theoretical maximum of 78.5%. Commercially available Class D switching amplifiers have reported efficiencies as high as 90%. Amplifiers of Class C-F are usually known to be very high-efficiency amplifiers.

6. List of bass amplifier and loudspeaker manufacturers

   en.wikipedia.org/wiki/List_of_bass_amplifier_and...

   This article lists manufacturers of bass amplifiers, loudspeakers, and other amplification-related items such as preamplifiers. The amplifiers and loudspeakers used to amplify bass instruments (e.g., the bass guitar, double bass and similar instruments) are distinct from other types of amplification systems due to the particular challenges associated with low-frequency sound reproduction.

7. Bass amplifier - Wikipedia

   en.wikipedia.org/wiki/Bass_amplifier

   An Ampeg SVT cabinet with eight 10" speakers, with a separate Ampeg SVT amplifier "head" on top. A Yamaha B100-115 combo amp, which contains a 100 watt amplifier and one 15" speaker in a wooden cabinet. A Hartke 500 watt amp "head" on top of an Ashdown 4x10" speaker cabinet.