I have some old speakers in the house that I wanted to test. So instead of messing with the real stereo unit from the 80s, I bought a $30 stereo from Amazon, and new speaker wire.
The speakers sound okay, but there’s a hum coming from them all the time. Even with the stereo volume knob turned all the way down. Is this normal for stereo systems and I just haven’t noticed?
I once bought a pair of of powered speakers that were huming. Had them sent back to manufacturer and got new replacement, non-huming pair. They had unbalanced analog inputs.