Solid Drive® is the solution for invisible sound, providing a hidden sound source for in-wall, in-ceiling, surface mount, and glass applications. The patented technology at the heart of SolidDrive® transforms nearly any rigid or semi-rigid surface (wood, sheetrock, glass, metal and more) into a sound source. The powerful SolidDrive directly transfers acoustic energy to the surface its mounted to, creating a large and dynamic sound field. For use on top of any horizontal surfaces including glass, granite, metal, wood, ceramics, laminates, and composites. Special silicone rubber pad "grips" any nonporous surface. Available in a chrome finish. The SD1 Desktop Kit 250 is ideal for testing how a SolidDrive will sound on any horizontal or vertical surface prior to permanent installation. Kit includes: one (1) SolidDrive SD1 Desktop, DC power adapter, SD-250 mini-amp with built-in EQ curves, cables, carrying case, and instructions. Features a 7-year warranty. Specifications: Type: | Full range transducer | Frequency Response: | 60 15,000 Hz Nominal w/o EQ | Nominal Impedance: | 8 ohms | Recommended Amp Power: | 10 100 watts | Max Program Power (with separate amplifier): | 100 watts, with 100 Hz 12 dB octave high-pass | Max Amplifier Power (included mini amplifier): | 2 x 50 watts | Diameter housing body: | 2.062? / 52.34 mm | Height housing body: | Height: 2.30? / 58.6 mm | Mounting foot dimensions: | 2.130? / 54 mm | Covered Angle: | 120º | Weight: | 1.5 lbs./ 0.67 kg | Shipping Weight: | 4.3 lbs. | Shipping Dimensions: | 13? (H) x 10? (W) x 4: (D) | |