The S 81 CEN is engineered for clear balanced dialogue reproduction making it an ideal center channel for a premium surround sound system. The WaveGuide focuses frequencies in the vocal range directly to the listening area so dialogue is clear articulate and realistic and you never miss a detail. The 1\" soft dome tweeter provides smooth refined high frequencies with dual 4\" polyfiber woofers for balanced dynamic low end while the rear-firing slot port allows for better low frequency extension.