REL and Class D amps

I have two REL subs and since I bought a Class D (icepower 500w) I can't figure how to connect them to the amp through high level metod. I tried the way I had them installed with a 4bsst bryston (red and yellow to the same + amp's binding post and the black wire to the - post, but it doesn't work now. I only get pops from the speakers. Any idea how to connnect two Rels to a 5 channel icepower amp?
Any input is very much appreciated.