In stock and shipped from Temecula, California, USA. The Scan Speak 23W/4557T02 Revelator is designed to be used as a woofer or subwoofers. It features a very rigid black aluminum cone that operates as a piston over a wide frequency range, in combination with Scan-Speaks linear suspension and the patented Symmetrical Drive (SD-1). This results in very low distortion and a smooth and well behaved frequency response as well as perfect transient reproduction. - Patented Symmetrical Drive Motor Design- Black Anodized Rigid Aluminum Cone- Long Throw Surround- Die cast Aluminum Chassis vented below spider- Ferrite Magnet System with Rubber Boot- Gold Binding Post Terminals Size:23 cm Fs:21 Hz Re:3.5 ? Qt:0.47 Sensitivity:82 dB VAS:45 ltr. Sd:232 cm² Bl:9.3 Tm