Don't know if it makes any difference to you, but Madrigal Audio recommends XLR 110 ohm digital cables over ST optical for their transport to DAC connectors. And they provide both these outputs (and others) on transport and also as inputs on DAC. Their position is that if "optimally" executed, the 110 Ohm XLRs have the "potential" to sound the best. I've compared Madrigal's XLR to the comparably priced Cardas and while the Madrigal was more detailed, the Cardas had better pace, rhythm, and timing-- I preferred (and kept) the Cardas. Based on Madrigal's recommendation for XLR, I did not try try the ST optical. Good Luck. Craig.
Digital vs Optical for DVD player
While I have experimented with interconnects, speaker wires and power cords I woke up to the fact that the salesman sold the wife an optical cord for the audio portion from the DVD to the digital receiver. Out of ignorance on optical cables I look to esteemed posters here to advise as to whether a 75 ohm cable output would offer better transferance of signal than the an optical cable????