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Is there some program that visualizes the output level of audio?
I thought my stereo was starting to die because at higher volume levels I heard a relay sound and all audio is cut off and it comes back after a few seconds. I switched the "old" amp for another one and I've got the sam issue?
So I'm guessing it's got something to do with too high output level. I checked alsamixer and nothing is in red also the audio doesn't sound distorted what you could expect from too high input.
Difficult to say without actually knowing the circuitry inside the stereo. There could be some kind of input overload detector that shuts off the amplifier. If your computer sound card does not have a line level output connector you could be over driving the stereo.
I would guess any software output level meter would be just a percentage of full scale. It will not tell you what sort of actual signal amplitude is at the output connector.