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Wireless mobile telephony (WMT) PA systems are PA paging and intercom systems that use any form of wireless mobile telephony system such as GSM networks instead of a centralized amplifier to distribute the audio signal to paging locations across a building or campus, or other location.
The receiver/speaker unit generally contains an amplifier to boost the audio signal to the loudspeaker; it is powered either by batteries or by an AC electric outlet. [2] The signal frequency range used by wireless speakers is generally the same as that used by cordless telephones – 900 MHz. The RF signal can traverse walls and floors/ceilings.
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 ...
Polk Audio, Inc. is an American manufacturer of audio products best known for its home and automobile speakers. The company also produces a wide range of other audio products, such as amplifiers and FM tuners. The company's headquarters is in San Diego, California. In 2006, it was bought by Directed Electronics. [1]
Assistant: Alexa | Connectivity: Bluetooth, Wi-Fi | Spatial audio: Yes | Special features: 8-inch touchscreen Imagine a tablet with a beefy speaker grafted onto the back: That's the Echo Show 8 in ...
The equaliser, connected between pre-amplifier output and power amplifier input, effectively flattens the speaker frequency response. [26] Each speaker has nine identical 4-inch drivers per channel — one on the front for direct sound, and eight on the rear designed to produce reflected sound. [23] [27]