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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. 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]

4. Crown International - Wikipedia

   en.wikipedia.org/wiki/Crown_International

   By 1977, all of Crown's tape recorder products had been phased out. [2] In 1979, Crown introduced the PSA-2 & SA-2 power amplifiers with analog computer control of transistor performance to maximize output characteristics. [2] The FM-1 stereo radio tuner was praised at the Consumer Electronics Show. [2] In 1981, the FM-2 with digital tuning was ...

5. EL84 - Wikipedia

   en.wikipedia.org/wiki/EL84

   250 V a 250 V g2 I a = 48 mA R k = 135 Ω: 170 V a 170 V g2 I a = 70 mA-12.5 V g1: Maximum Output Power (single-ended Class A) 5.7 W @10% THD into 5200 Ω, 250 V supply, 4.3 V RMS input 5.3 W @10% THD into 2500 Ω, 200 V supply, 7.0 V RMS input Maximum Output Power (2 tubes, push-pull Class AB) 17 W @4% THD into 4+4 kΩ, 300 V supply, 10 V RMS ...

6. Full-range speaker - Wikipedia

   en.wikipedia.org/wiki/Full-range_speaker

   Several manufacturers build small (typically 115 mm (4.5")) diameter full-range drivers into miniature enclosures, and many of these include 25 or 70-volt line transformers, for use on commercial sound systems employing long speaker cables.

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