G. QUESTIONS AND ANSWERS Q. MyCDpla~,er has both fibre optic and coaxial outputs. Whichone should I use? A. Given a choice, we prefer the AT&T optical link due to its ability to completelyisolate the groundsbetween the digital source componentand the Processor. This minimizesthe possibifity of groundloops in the digital components. The AT&T format also has the added-benefit of substantially higher bandwidththan coax or the standard fibre optic interface.