Oak, the wire you use to connect your receiver to your sub has nothing whatever to do with how "tight" the bass is. You've apparently been reading or hearing some more audio nonsense. Any coaxial cable with an RCA plug on each end does fine. You can get one for about $5 at RadioShack. If you want to splurge on a pretty-colored cable with gold connectors you might have to go about $20. Don't waste your money.

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Enjoy the music, not the equipment.