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2. Dynaco - Wikipedia

   en.wikipedia.org/wiki/Dynaco

   Concurrent with A-25 production, Dynaco introduced the QD-1 speaker adapter which synthesized 4-channel sound from the stereo amplifier output. This "Dynaco patent" required a single resistor and a threeway potentiometer for the two rear speakers, generating phase difference signals for a feeling of ambience.

3. Audio power amplifier - Wikipedia

   en.wikipedia.org/wiki/Audio_power_amplifier

   A micro audio amplifier for boosting the output of line level sources to headphones or small speakers. Edge length 4 cm, mass 16 g , power output about 100 mW into a 32 Ω load. The final stage of amplification, after preamplifiers, is the output stage, where the highest demands are placed on the transistors or tubes.

4. Vehicle audio - Wikipedia

   en.wikipedia.org/wiki/Vehicle_audio

   Some head units have built-in stereo amplifiers. Other car audio systems use a separate stand-alone amplifier. Every amplifier has a rated power level sometimes noted on the head unit with the built-in amplifier, or on the label of a stand-alone unit. Coaxial speakers: These are the most common type of car speakers and are often factory-installed.

5. Sparkomatic - Wikipedia

   en.wikipedia.org/wiki/Sparkomatic

   By the mid-1970s the company had become known for their car audio products and accessories, though they continued to sell other non-audio accessories for a short time longer. Sparkomatic was at that time primarily a producer of low to mid-range car audio products, as well as adapters to convert an 8 track player into a quadrophonic unit.

6. AV receiver - Wikipedia

   en.wikipedia.org/wiki/AV_receiver

   An audio/video receiver (AVR) or a stereo receiver is a consumer electronics component used in a home theater, home audio, or hi-fi system. Its purpose is to receive audio and video signals from a number of sources, and to process them and provide power amplifiers to drive loudspeakers , and/or route the video to displays such as a television ...

7. Threshold Audio - Wikipedia

   en.wikipedia.org/wiki/Threshold_Audio

   Threshold Audio is a high-end audio equipment manufacturer originally established in California in 1974 by audio engineer Nelson Pass and graphic designer René Besne. The company, today based in Houston Texas, manufactures mono-block and stereo power amplifiers, multi-channel power amplifiers and stereo control amplifiers.