Sure, Mike. It always makes sense to start at the source and work your way along. There's virtually no chance of overdoing it with interconnect dampers, but then again, oftentimes there's no need for dampers on every interconnect plug.
Interconnect dampers are sometimes more beneficial at one end of a cable or the other, sometimes most beneficial at both ends. The only way you can tell is by trying them in different configurations. Sometimes though, damping a single RCA plug may provide benefit that is very subtle and maybe undetectable, but accumulatively adds up. Sometimes too, the result of damping one end of an interconnect is masked by the undamped other end.
With a couple of pairs of JRs, you can audition them as you go along to find out where they are most beneficial. For thorough auditioning, take an additive approach, and then incrementally subtract. You might end up skipping the transport/DAC cable and start with the DAC/preamp cables. But what do I know? The only way to know is by self-discovery, as results are always unique to the individual system.
Herbie's Audio Lab