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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

   The first grounded bridge product released by Crown was the M600 amplifier (1974) primarily employed for commercial sound installations including constant voltage loudspeaker systems. [8] Crown received a patent for the invention in 1974. [9] After proving itself in the field, the topology was used to design the Microtech MT-1000 in 1984. [7]

5. 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.

6. Mains electricity by country - Wikipedia

   en.wikipedia.org/wiki/Mains_electricity_by_country

   Self-governing British crown dependency, but generally uses UK technical standards. Israel: C, H 230 V 400 V 50 Hz Italy: C F, L CEI 23-34 CEI 23-50 230 V 400 V 50 Hz Type L uses two gauges of plug and socket. The 10 amp version has pin spacing that is compatible with Europlug. The 16 amp version uses wider pin spacing and larger pins.

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