I need help connecting 2 separate avr receivers together. First i have a pioneer VSX-520-K 5.1 with a optical projector around my pool, second I have a avr-s900w denon with 5.1 inside my tiki bar connected to a 1080p tv and two additional speakers next to the hot tub. My goal is to take whatever input source and mirror both audio and video simultaneously at the pool and tiki bar. However I can not seem to get the second avr to produce any sound. So my question is; does anyone know of a way to work around this?