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KFOR-TV (channel 4) is a television station in Oklahoma City, Oklahoma, United States, affiliated with NBC. It is owned by Nexstar Media Group alongside KAUT-TV (channel 43), an owned-and-operated station of The CW. The two stations share studios in Oklahoma City's McCourry Heights section, where KFOR-TV's transmitter is also located.
If a home hi-fi amplifier specifies 8 ohm or greater loads, care should be taken that loudspeakers with a lower impedance are not used, lest the amplifier be required to produce more current than it was designed to handle. Using a 4 ohm loudspeaker system on an amplifier specifying 8 ohms or greater could lead to amplifier failure.
QVC on 30.2, HSN on 30.3, QVC2 on 30.4 Oklahoma City: Oklahoma City: 34 33 KOCB: Ind. TBD on 34.2, Comet on 34.3, Dabl on 34.4 Oklahoma City: Woodward: 36 35 KUOK: UNI: Oklahoma City: Oklahoma City: 43 19 KAUT-TV: CW: Court TV on 43.2, Ion Mystery on 43.3, Cozi TV on 43.4 Oklahoma City: Norman: 46 16 KOCM: Daystar: Daystar Enspol on 46.2 ...
Such loads are around 1/1000 the impedance a line out is designed to drive, so the line out is usually not designed to source the current that would be drawn by a 4 to 8 ohm load at normal line out signal voltages. The result will be very weak sound from the speaker and possibly a damaged line out circuit.
The voltage on a speaker wire depends on amplifier power; for a 100-watt-per-channel amplifier, the voltage will be about 30 volts RMS. At such voltage, a 1% loss will occur at 0.3 ohms or more of inductive reactance. Therefore, to keep audible (up to 20,000 Hz) losses below 1%, the total inductance in the cabling must be kept below about 2 μH.
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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 ...
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