I noticed the right speaker was producing almost no volume when playing my turntable. The left channel was probably 15 db louder than the right.
Balance and volume are fine with other digital or analog sources, so I figured the issue was in the turntable or phono preamp.
I switched left and right inputs from the turntable into the phono preamp. Magically, the L/R balance returns and overall volume matches other sources. Switching the inputs back reproduces the left side dominant condition. The only problem with the arrangement that produces the proper balance is that L and R are reversed.
But, what could be going on here? If a turntable problem, I would expect the problem to follow the turntable lead switch. If a phono preamp problem, I'd expect the problem to remain in the right channel. How can switching the leads FIX the balance issue?
I switched the turntable interconnect. Seems to have fixed the issue. With the old cable, it was repeatable though, which was weird. Balance was fine one way, bad when switched. Switching back and forth recreated the same results.