Nick,

The 8ks may have differential (balanced) circuits, whereas the G68 (at least mine) is signle-ended. The signle-ended circuit is more susceptible to noise and therefore would respond moreso to a power cable than the differential circuit.

DSP6000, DSP5200, DSP5500VC, P300W, SW1600, G68, 568.2, HD621, G57, G55, Oppo BDP-105.