Electrical properties of cables

I'm running a pair of 1 meter XLR VDH cables from a Benchmark DAC to a Bryston Pre. The sound in one channel is ever so slightly louder (1dB?) than the other. I especially noticed this with a 1kHz test tone while flipping the mono/stereo switch. This problem follows the cable when swapping channels. They pass a continuity check but I haven't ohm'd them out yet.

Any other suggestions before I toss them out? By the way, the custom Canare/Neutriks work just fine in this application.