Rob, no different suggestions, just to confirm that the increase that was spoken of is an increase in the sub trim level(which increases the voltage output)on the receiver(e.g., the +3 that you've now set), not an increase in the sub volume level control. In fact, as you now see, the volume control should be turned down when the sub voltage output on the receiver is increased, so that there's no overall change in the calibrated sub level.
I watched Alan's video on how to set up the 500 before doing anything. I started with the knob in the 10:00 position. It is waaay down now but still putting out 78 db. I am going to stay the course - a little wiser - and if it wonks out again, I'll be back with JC....
