2 interconnects or y-cable?

have a 2.1 channel system for music. I will be connecting my subwoofer to a two channel analog pre-amp. Would it be better to run two interconnects into the subwoofer (about 8 feet of distance) or should I use a y-cable at the pre-amp and a dedicated subwoofer cable. I have a Harmonic Technology subwoofer cable which is mono at the pre-amp end (designed for a pre/pro) and has a built in Y at the subwoofer end. My sub has "L" and "R" inputs, but nothing else gets connected to the sub.

Thanks!

Thanks.