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What is 775mv?

775 mVRMS designates the signal level that equals to 0 dBu. 🙂

The decibel unloaded reference voltage, 0 dBu, is the AC voltage required to produce 1 mW of power across a 600 Ω impedance. The origin of this odd value comes from the old analog telephony era, where 600 Ohm impedance was standard.

Simply said: 775 mVRMS gives a power of 1 mW on 600 Ohm load.

The most common nominal level for professional audio equipment is +4 dBu (by convention, decibel values are written with an explicit sign symbol). For consumer equipment it is −10 dBV (1 VRMS = 0 dBV). Majority of “HiFi” and “High-End” audio devices, such as Digital to Analog Converters, Preamplifiers, and Amplifiers use professional signal levels for their analog interfaces.

If any or all of the above sounds irrelevant to you, simply remember: 775mv.com is where you find the finest products for your Audio.

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