When troubleshooting audio reproduction equipment, what approximate RMS level would you expect the signal into the audio amplifier to be?

In audio reproduction equipment, the typical RMS (Root Mean Square) level of the signal entering an audio amplifier is usually around 1,000 millivolts, or 1 volt. This level is a standard reference for line-level audio signals in professional and consumer audio equipment.

1,000 millivolts is a common target because it provides a suitable balance between signal strength and noise, allowing for good sound quality without distortion. Signals at this level are adequate for full-range audio without requiring excessive amplification or introducing unwanted noise.

Working with other voltage levels like 500 millivolts and 750 millivolts may lead to insufficient signal strength for some audio applications, especially in professional contexts where greater headroom is needed to avoid distortion during peaks in the audio signal. On the other hand, signals as high as 2,000 millivolts are also possible, but they often exceed the optimal input for consumer-grade equipment, leading to potential clipping or distortion issues.

Thus, 1,000 millivolts is the most appropriate answer for expected RMS signal levels into an audio amplifier, reflecting a common standard in both professional and consumer audio environments.