If your handy with a soldering iron, remove the amp end RCA's from the interconnect you use between your pre-amp and amp. Get a decent (Nuetrik or Switchcraft) 1/4" plug and solder it on where the amp end RCA was. Make sure that you have continuity from the RCA pin to the 1/4" tip and from the RCA ring to the 1/4" sleeve. Then just plug your cable into the 1/4" inputs on the JB:/Urei. OR, you could just attach the bare wires from your interconnect (after removing the RCA) at the amp end to the barrier strip. Hook up the wire that corresponds with the RCA tip to the + and the RCA ring to the - terminal. Check the manual on the JBL/Urei, but you will probably also need to jumper between the (-) terminal and the ground on each channel.