Use Ultra with accurate speakers that have well-damped enclosures to appreciate fully its resolution and power-carrying capability. To capture the full capabilities of an Ultra-based system, ask your retailer to help you with speaker placement and room treatments. Ultra is upgradeable to Reference speaker cable or above. SPECIFICATIONS Standard termination: spade > spade Lengths: 8 feet, 10 feet, 12 feet, 15 feet, 20 feet, 25 feet Custom terminations/lengths/singles always available. Biwire version available. Adaptors: banana, pin, bar spade, biwire