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Line outputs usually present a source impedance of from 100 to 600 ohms. The voltage can reach 2 volts peak-to-peak with levels referenced to −10 dBV (300 mV) at 10 kΩ . The frequency response of most modern equipment is advertised as at least 20 Hz to 20 kHz, which corresponds to the range of human hearing .
Sony MDR-V6 in its old retail box. Sony MDR-V6 is a large diaphragm folding pair of headphones, the initial entry in Sony's Studio Monitor headphones, one of the most popular model lines among professional audio engineers.
Beyerdynamic GmbH & Co. KG (stylized as beyerdynamic) is a German manufacturer of microphones, headphones, wireless audio systems, and conference systems. Headquartered in Heilbronn , Germany, Beyerdynamic has been family-owned since its founding in 1924.
Its impedance at audio frequencies, and especially at the more restricted telephone band frequencies, is far from constant. It is possible to manufacture this kind of cable to have a 600 Ω characteristic impedance but it will only be this value at one specific frequency. This might be quoted as a nominal 600 Ω impedance at 800 Hz or 1 kHz.
By definition, this is the equivalent of a continuous power dissipation of 1 mW , i.e., the power consumed if a voltage of 0.775 V is applied to a telephone line with 600 Ohm nominal impedance. [ 1 ] In the Bell System , central offices provided this type of service on a dedicated telephone number (102 type Milliwatt line) for remote subscriber ...
In audio, 0 dBm often corresponds to approximately 0.775 volts, since 0.775 V dissipates 1 mW in a 600 Ω load. [16] The corresponding voltage level is 0 dBu, without the 600 Ω restriction. Conversely, for RF situations with a 50 Ω load, 0 dBm corresponds to approximately 0.224 volts, since 0.224 V dissipates 1 mW in a 50 Ω load.
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