SUNDOWN AUDIO SA CLASSIC 10: Features & Technology: Xmax = 19mm one-way by 70% BL RMS Power = 750-watts Vented magnetic gap Optimized high-velocity pole vent Innovative high-velocity vented frame spacer ring Black Aluminum 2.5” voice coil former for superior heat dissipation High-Temperature copper voice coil wire Large aluminum faraday ring (Magnet ID) Spring Loaded Terminals Stitched-On “XL” Tinsel Leads to prevent fatigue and failure High strength cast aluminum frame Optimized for small ported, sealed, & band-pass enclosures These features combine to create the optimized coil ventilation system