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2. Constant-voltage speaker system - Wikipedia

   en.wikipedia.org/wiki/Constant-voltage_speaker...

   Constant-voltage speaker systems are also commonly referred to as 25-, 70-, 70.7-, 100 or 210-volt speaker systems; distributed speaker systems; or high-impedance speaker systems. In Canada and the US, they are most commonly referred to as 70-volt speakers. In Europe, the 100 V system is the most widespread, with amplifier and speaker products ...

3. Valve Amplification Company - Wikipedia

   en.wikipedia.org/wiki/Valve_Amplification_Company

   It is well known for having produced the Marantz Classic series of amplifiers for Marantz Japan from 1996 to 1998 (Marantz Model 7 / 7C, Model 8B, Model 9), as well as the VAC-designed Model 66 integrated amplifier. In addition, it redeveloped and produced the first 200 recreations of the LA-2A leveling amplifier for Universal Audio in 1998.

4. Talk:Constant-voltage speaker system - Wikipedia

   en.wikipedia.org/wiki/Talk:Constant-voltage...

   For example, in 1967, Crown International introduced the DC300 amplifier, which is capable of directly driving 70-volt lines, as well as traditional speaker loads, thanks to its overall power [1] of 500W. [2] In 1987, Crown introduced the Macrotech 2400, capable of driving 100-volt lines directly. [3]

5. Full-range speaker - Wikipedia

   en.wikipedia.org/wiki/Full-range_speaker

   A large number of full-range drive units are used in commercial sound systems, which may employ a number of 200 mm (8") full-range drivers, mounted into suspended ceilings or small 'back-box' enclosures. These convey background music and announcements to workers and visitors in retail stores, and public spaces. While these drivers are classed ...

6. Harman Kardon - Wikipedia

   en.wikipedia.org/wiki/Harman_Kardon

   In 1959, Harman Kardon marketed the Citation II, an early ultra wideband stereophonic tube amplifier. It featured 60 watts/channel output with a frequency response of 18-60,000 Hz at 20 watt output. [20] The company promoted their philosophy of designing high fidelity sound using amplifiers that provided widest possible audio bandwidth.

7. KT88 - Wikipedia

   en.wikipedia.org/wiki/KT88

   The transmitting tubes TT21 and TT22 have almost identical transfer characteristics to KT88 but a different pinout, and by virtue of their anode being connected to the top cap have a higher plate voltage rating (1.25 kilovolt) and a higher power output capability of 200 watts in class AB1 push–pull.