I used to have the Yamaha DSPA1 and the Rel was just fine, however since upgrading to the Z9, I've noticed a strange problem. When navigating the DVD menus, there is an audio pop that occurs as the menu selection is started and then end, returning to main menu. The effect appears to be amplified by the REL (the pop appears to come from all the speakers, not just the sub. If the REL is powered off, or the interconnect removed, the audio pop can barely be heard. Sometimes this pop is heard when discs hit the layer change. I'm using the Z9s rca 5.1 subwoofer out jack to the low level input on the REL. Z9 crossover set at 90Hz, but varying this makes no difference. Anyone have similar experience or tips for correcting this (other than turning off the subwoofer!!) Thanks.