Built for large commercial and residential installations, the Professional Grade speaker cable is designed for pros who want to provide customers with the best quality audio and get the job done quickly and efficiently. Rated for both in-wall and direct burial use, this four-conductor high strand count copper cable provides excellent signal transfer over long cable runs (over 50 ft), and the 4-conductor wire has a higher threshold for power and can be bi-amped (two amps to a single speaker) for volume control installations. The reinforced but flexible polypropylene jacket is UV resistant and protects the copper conductors from high heat and cold conditions as well as dirt, dust and other elements that can degrade cable integrity. Features that cater to demanding integrators include a reinforced box with an easy pull, snag-free design, and tissue-wrapped conductors for quick stripping. The extra sturdy box has a large payout hole, so cable runs are fast and smooth while the patented REELEX technology pulls coils from the inside out to prevent twists, knots, and tangles that can slow job progress. This sturdy audio speaker cable also includes two-foot increment printed markers so you can determine how much cable has been used and how much is left in the box, making long cable runs easier than ever.