Does sub cable also have to be high end?

After spending too too much on PowerSnakes, Bybee filters, Red Dawn II's, Golden Cross RCA's, etc -- I'm wondering if the quality of the sub cable also makes a difference, as it is just responsible for low frequency. My system is a hybrid combination of HT and 2 channel SACD stuff, some reasonably hi end. HT: Marantz 14EX (rear channels, surrounds), Aranov 9100 Mono Blocks (front channels for HT and 2 channel stereo) Red Dawn Rev II speaker cables. Pioneer DV-38 (HT DVD and DVD Audio): First Sound Reference II Passive Preamp and Sony SCD-1 for two channel. Kef Reference 4's in front (roll off at about 30), Kef Ref 2's in rear, Kef Bipolar surrounds and Kef 200 Centre for 7.1 channel THX-EX. Bybee filters, Power Conditioners, etc.

Sub to connect is Velodyne HGS 18. Please let me know what others have used to connect the big Velo in a high end HT system that is also used for 2 channel or DVD audio and if I need to spend $$$ on a long cable (unbalanced). Will be used 75% for HT and 25% for DVD-A (which to me, has not lived up to its promise and the reason for me buying SCD-1).