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They were out of polarity!
Hey, it happens. : ) It's happened to me. I first had it happen to me when I was a teenager and I pressed the mono button on my receiver and got greatly diminished sound because the two channels combined largely cancelled each other out. I was in shock. Right on red, that's my motto to keep things in phase, for both equipment inputs and speaker connections. : )
Oh, I see what you are getting at.
Fair enough! Thanks! ; )