First of all you don't want to have your sub crossover in the loop since your receiver is handling the bass managment. Turn the crossover knob on the 500 to "bypass", or to the highest setting if you have a newer model. You don't want the sub on 80 and the receiver.

Also, did you set your delay (distance) setting in the receiver for all speakers?

Also, where is the sub positioned in relation to the other speakers? Did you also calibrate your speakers using the receiver pink noise to the same SPL?

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85