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This is important because power amplifiers become increasingly impractical with increasing amplifier power output. Many high-quality domestic speakers have a sensitivity between ~84 dB and ~94 dB, but professional speakers can have a sensitivity between ~90 dB and ~100 dB.
A micro audio amplifier for boosting the output of line level sources to headphones or small speakers. Edge length 4 cm, weight 16 g , power output ca. 0.1 W into a 32 Ohm load. The final stage of amplification, after preamplifiers, is the output stage, where the highest demands are placed on the transistors or tubes.
Active subwoofers include a built-in amplifier. [7] The first home audio subwoofers were developed in the 1960s to add bass response to home stereo systems. Subwoofers came into greater popular consciousness in the 1970s with the introduction of Sensurround in movies such as Earthquake, which produced loud low-frequency sounds through large ...
Stereo amplifiers imply two channels of output (left and right), though the term simply means "solid" sound (referring to three-dimensional)—so quadraphonic stereo was used for amplifiers with four channels. 5.1 and 7.1 systems refer to Home theatre systems with 5 or 7 normal spatial channels, plus a subwoofer channel.
Block diagram of a basic switching or PWM (class-D) amplifier. Boss Audio class-D mono amplifier with a low-pass filter for powering subwoofers. Class-D amplifiers use some form of pulse-width modulation to control the output devices. The conduction angle of each device is no longer related directly to the input signal but instead varies in ...
The first 2.1 audio system from Bose was the "Lifestyle 10", which was released in 1990. The Lifestyle 10 included a single-disk CD player, an AM/FM radio and "Zone 2" RCA outputs which could be configured to output a different source to the primary speakers. A 6-disk magazine-style CD changer was introduced in 1996.
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