How does going to a linear arm negate these adjustments? With it being absolutely level is added to your problems, and if your overhang is off, it is off all the time.
The idea of reversing the ground and hot on one channel is old and does not work with having any other input as you have to reverse that side's speaker cables also.
The idea of reversing the ground and hot on one channel is old and does not work with having any other input as you have to reverse that side's speaker cables also.