You are correct. When you remove the jumper you have disconnected the NAD's amp and when you take an IC from the RCA of the pre-out to the D100's you have effectively replaced the amp in the NAD. Mono amps only need one RCA. You run an one IC from each pre-amp out (L&R) to the appropriate (L&R) amp. Don't forget to disconnect the NAD from your speakers.
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