Rob, you would connect the left and right main channel pre-outs to any left and right inputs on the integrated amp designed to input line-level signals. Probably CD is the most likely choice and there might also be TV inputs which do the same thing. You wouldn't use the Phono inputs which handle signals much lower in level. Are you sure that simply using the amps in your new receiver wouldn't be as good or better?

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Enjoy the music, not the equipment.