I just got a new Denon 4802 receiver and I now need a bunch of opitcal cables to hook everything up. I noticed a quite a bit of difference in the prices of opitcal digital audio cable from $12 to $40. All of them are around the same short lengh. The cheaper opitcal cables are a little thinner than the more expensive cables. Since these cables are digital, is there a difference in the quality. I would think that since they are all digital, there would be no difference.