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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

   On June 10, 2014, Kevin Hayes was issued U.S. Patent 8,749,310 for "amplifier bias control". This patent covers the only known technique for observing the true underlying quiescent current (idle current) of an output tube (or transistor) under dynamic signal conditions, and then holding it to the stable target value with a precision of 99% or ...

4. 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.

5. Hayden (electronics company) - Wikipedia

   en.wikipedia.org/wiki/Hayden_(electronics_company)

   Hayden is a British company which designs hand-wired electric guitar amplifiers. It is a sister company to Ashdown Engineering, which makes high-quality, hand-wired, vacuum-tube (or valve in Britain) amplifiers in England. At the end of 2007 it was announced that Dave Green, Matamp's chief engineer, would be joining Hayden full-time as 'Valve ...

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.

7. 3 Family Members Die After Eating Homemade Christmas ... - AOL

   www.aol.com/lifestyle/3-family-members-die...

   At least three members of a family have died, and three others have been hospitalized, after eating a traditional Christmas cake — months after the baker's husband died from food poisoning.