I have an older Yamaha RX-V567 and Polk Audio Center, Sub and 2 Tower speakers currently connected using the larger output speaker jacks. I want to connect a Rockville EQ that has only RCA jacks. I've tried a couple of combinations but it doesn't work. How can I connect and programme it to use the Rockville EQ? I would rather not use the onboard 5 channel EQ that they say can be set up with the unit. The Rockville is Dual 2 channel 10 band with RCA input and outputs. I just need to know how to get this to workwith the Yamaha.