If it's any help, I've been very pleased with BetterCables Silver Serpent sub cables. I have a pair of Boston PV600 subs, hardly thunderboxes but very quick, tight and musical.
I have had good results using Cobalt Cable ultimate subwoofer cables. I run a single cable into their y adapter, and feed the L & R inputs to my sub. I use this configuration on both my systems which comprise of a Dunlavy sub in my HT room, and a Bagend infrasub 18 in my bedroom system.
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