Dayton Audio DAEX25VT-4 Vented 25 mm Exciter 20 W 4 Ohm Overview Take your product or project to the next level by turning it into a speaker! The DAEX25VT-4 is designed by Dayton Audio with voice coil cooling air vents, for high-power applications. Highlights - Small size; just over 2" diameter, about 7/8" high - Pre-applied 3M VHB adhesive for quick, secure installation - Rare-earth neodymium motor and a proprietary voice coil - 4-ohm impedance for use with small, Class D amplifiers - 20 watt RMS power handling for high output Dayton Audio DAEX25VT-4 Vented 25mm Exciter 20W 4 Ohm Dayton Audio's 25 mm DAEX25CT-4 coin type exciter features the same ability to turn nearly any surface into a speaker, as other exciters and tactile transducers, only in a more compact package for working with smaller surfaces. This exciter's small size enables audio reproduction in places never imagined: toys, monitors, cabinet doors... even windows! A neodymium magnet is employed to create maximum magnetic flux around the proprietary voice coil for increased sensitivity when compared to similar sized exciters. In turn, this reduces power requirements and makes it possible to use very small audio amplifiers, without sacrificing total output. The 1" voice coil, and cooling vents, allows for more input power for higher output applications while maintaining a slim-line form factor. To ensure maximum acoustic energy transfer between the transducer and the surface to which it is attached, 3M VHB (Very High Bond) adhesive is pre-applied... just peel and stick! Two PCB solder points keep installation and wiring as compact as possible.