clo, if your nad has a preamp out you could use that for the sub. depending on the connection options of the sub you select you might be able to your speaker cables to the sub and then another set from teh sub to the monitors, but I would advise against this as it tends to degrade sound quality.
my $0.02 - keep the vr-1s in the mix. for teh $$ they are an outstanding performer.
my $0.02 - keep the vr-1s in the mix. for teh $$ they are an outstanding performer.