SolidDrive SD1SM-T Wood Surface Mount Actuator with Transformer in TitaniumThe SD1sm T can be installed onto wood and other hard surfaces. For best results, our engineers recommend trying out the SolidDrive on the desired surface before installing. Each SD1sm T is designed for one channel of audio. SolidDrive utilizes patent pending dual voice coil technology in an aluminum enclosure to transfer acoustic energy to any substrate. Using high powered neodymium magnets and dual symmetrically opposed motors, SolidDrive converts