voltage reading on amp channels

[93civEJ1 10+ year member]

I went out to set my gain a few mins ago on a 2 channel amp to run my component speakers. I was setting them to 20 volts (100 watt rms) to a 1khz sine wave with the HU at the 3/4th mark. One channel would read right at 20...when I would check the other channel it would be around 18.6 Is this common? What would cause this issue?

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[93civEJ1 10+ year member]

alright , sweet...no one?