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  2. Wireless speaker - Wikipedia

    en.wikipedia.org/wiki/Wireless_speaker

    The receiver is positioned where the listener wants the sound to be, providing the freedom to move the wireless speakers around without the need of using cables. The receiver/speaker unit generally contains an amplifier to boost the audio signal to the loudspeaker; it is powered either by batteries or by an AC electric outlet. [2]

  3. Quantum heat engines and refrigerators - Wikipedia

    en.wikipedia.org/wiki/Quantum_heat_engines_and...

    The relation between the quantum amplifier and the Carnot efficiency was first pointed out by Scovil and Schultz-DuBois: [1] Reversing the operation driving heat from the cold bath to the hot bath by consuming power constitutes a refrigerator. The efficiency of the refrigerator defined as the coefficient of performance (COP) for the reversed ...

  4. Absorption refrigerator - Wikipedia

    en.wikipedia.org/wiki/Absorption_refrigerator

    Common absorption refrigerators use a refrigerant with a very low boiling point (less than −18 °C (0 °F)) just like compressor refrigerators.Compression refrigerators typically use an HCFC or HFC, while absorption refrigerators typically use ammonia or water and need at least a second fluid able to absorb the coolant, the absorbent, respectively water (for ammonia) or brine (for water).

  5. Leslie speaker - Wikipedia

    en.wikipedia.org/wiki/Leslie_speaker

    The first models Leslie manufactured were the 900 and 910, [37] which contained a 100 watt, three-channel power amplifier. Both could split into two sections. [38] The most popular version of the Pro-Line series was the 760. It was a smaller version of the 900 and 910, and contained a 40 watt treble and 50 watt bass amplifier. [39]

  6. SABA (electronics manufacturer) - Wikipedia

    en.wikipedia.org/wiki/SABA_(electronics...

    Herman Schwer, the founder's grandson, started the manufacturing of headphones, radio parts, and a variety of products from radio components to receivers. 1950s era SABA radio. In 1931, SABA produced more than 100,000 units of the SABA Radio Type S-35. It introduced for the first time on the market dynamic loudspeakers which soon became a ...

  7. Acoustic Research - Wikipedia

    en.wikipedia.org/wiki/Acoustic_Research

    Acoustic Research was a Cambridge, Massachusetts-based company that manufactured high-end audio equipment. The brand is now owned by VOXX.Acoustic Research was known for the AR-3 series of speaker systems, which used the 12 in (300 mm) acoustic suspension woofer of the AR-1 with newly designed dome mid-range speaker and high-frequency drivers.

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