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2. Bridged and paralleled amplifiers - Wikipedia

   en.wikipedia.org/wiki/Bridged_and_paralleled...

   A bridge-tied load (BTL), also known as bridged transformerless and bridged mono, is an output configuration for audio amplifiers, a form of impedance bridging used mainly in professional audio & car applications. [1] The two channels of a stereo amplifier are fed the same monaural audio signal, with one channel's electrical polarity reversed.

3. Amplifier - Wikipedia

   en.wikipedia.org/wiki/Amplifier

   Amplifier. A McIntosh stereo audio amplifier with output power of 50 watts per channel used in home component audio systems in the 1970s. [1] Amplification means increasing the amplitude (voltage or current) of a time-varying signal by a given factor, as shown here. The graph shows the input (blue) and output voltage (red) of an ideal linear ...

4. Audio power amplifier - Wikipedia

   en.wikipedia.org/wiki/Audio_power_amplifier

   Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus 1 Hi Fi integrated audio amplifier (1984) [1]. An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.

5. Quadraphonic sound - Wikipedia

   en.wikipedia.org/wiki/Quadraphonic_sound

   Quadraphonic sound was a commercial failure when first introduced due to a variety of technical issues and format incompatibilities. Four channel audio formats can be more expensive to produce than standard two-channel stereo. Playback requires additional speakers and amplifier channels. It may also require specially designed decoding equipment.

6. Class-D amplifier - Wikipedia

   en.wikipedia.org/wiki/Class-D_amplifier

   The first class-D amplifier was invented by British scientist Alec Reeves in the 1950s and was first called by that name in 1955. The first commercial product was a kit module called the X-10 released by Sinclair Radionics in 1964. However, it had an output power of only 2.5 watts. The Sinclair X-20 in 1966 produced 20 watts but suffered from ...

7. Electrocompaniet - Wikipedia

   en.wikipedia.org/wiki/Electrocompaniet

   The 2 channel audio power amplifier was the first amplifier Electrocompaniet produced. It was a 2x25 Watt Stereo power amplifier based on the works of Dr. Matti Otala on TIM-free transistor design. It has been updated and re-produced several times.