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Audio Wiring Question.

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Mornin' All,

On Saturday night I set up a mobile  disco for a party. The set up included a double deck record player with mixer, separate amplifiers and speakers. The system is stereo. I made a mistake in the wiring and one channel was not working. I later discoverrd that I had inserted a mono 1/4 jack inch plug into a stereo 1/4 inch socket on the breakout box from the disco console before the amplifiers. This created a short circuit for one channel at the line level stage.

So, why did this not damage the output stage of the mixer due to the short circuit|? Are they inherently protected and failure safe?

Z.

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    Audio outputs of any quality do have a specific output impedance, (a resistor usually) and should not come to any harm. Professional output levels are however quite large (often plus 24 dBm) which is more like 12V RMS into audio loads and balanced, and floating from the Earth (Chassis) too.  A floating output is perfectly happy to have one side connected to the screen to give an unbalanced signal. As always it all gets a bit more complicated once one is away from "consumer"! Transformers are very rare now, the outputs are completely electronic.

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  • 0

    Audio outputs of any quality do have a specific output impedance, (a resistor usually) and should not come to any harm. Professional output levels are however quite large (often plus 24 dBm) which is more like 12V RMS into audio loads and balanced, and floating from the Earth (Chassis) too.  A floating output is perfectly happy to have one side connected to the screen to give an unbalanced signal. As always it all gets a bit more complicated once one is away from "consumer"! Transformers are very rare now, the outputs are completely electronic.

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