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The voltage is constant only in the sense that at full power, the voltage in the system does not depend on the number of speakers driven (as long the amplifier's maximum power is not exceeded). [2] Constant-voltage speaker systems are also commonly referred to as 25- , 70- , 70.7- , 100 or 210-volt speaker systems ; distributed speaker systems ...
American EIA standard RS-299A specifies that (or DCR) should be at least 80% of the rated driver impedance, so an 8-ohm rated driver should have a DC resistance of at least 6.4 ohms, and a 4-ohm unit should measure 3.2 ohms minimum. This standard is voluntary, and many 8-ohm drivers have resistances of ≈5.5 ohms, and proportionally lower for ...
Founded by Ralph C. Liebert (1918-1984) as Capitol Refrigeration Industries in 1946, Liebert Corporation was formed in 1965 as the industry's first [citation needed] designer and manufacturer of computer room air conditioning (CRAC) systems. Targeted to the mainframe computer data-processing market, Liebert CRAC systems were the first totally ...
A subwoofer is a woofer driver used only for the lowest-pitched part of the audio spectrum: typically below 200 Hz for consumer systems, [26] below 100 Hz for professional live sound, [27] and below 80 Hz in THX-approved systems. [28]
Loudspeaker enclosures range in size from small "bookshelf" speaker cabinets with 4-inch (10 cm) woofers and small tweeters designed for listening to music with a hi-fi system in a private home to huge, heavy subwoofer enclosures with multiple 18-inch (46 cm) or even 21-inch (53 cm) speakers in huge enclosures which are designed for use in ...
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