The following methods would allow for instantaneous comparison of two
interconnects. However, I would like to know whether or not these
methods are technically ok.

1. CD player is connected to preamp with right channel via interconnect
X to input A, left channel via interconnect Y to input B. Preamp is set
to mono, comparison is done by switching between inputs A and B.

2. CD player is connected to preamp at input A with interconnect X. The
record output of the preamp is connected back to preamp at input B via
interconnect Y. Comparison is done by looking if the insertion of
interconnect B has an affect.

TIA

Klaus