Dayton Audio DAEX13CT-4 Coin Type 13mm Exciter 3W 4 Ohm Overview Take your product or project to the next level by turning it into a speaker! The DAEX13CT-4 sound exciter, by Dayton Audio, is designed to turn small surfaces into a hidden sound source. Highlights - Super small size; just over an inch in diameter, about 3/8" high - Pre-applied 3M VHB adhesive for a quick, secure installation - Rare-earth neodymium motor - 4-ohm impedance for use with small, Class D amplifiers Dayton Audio DAEX13CT-4 Coin Type 13mm Exciter 3W 4 Ohm Dayton Audio's 13 mm DAEX13CT-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. Its 4-ohm nominal impedance facilitates the use of series and series-parallel wired arrays for a highly focused, minimum dispersion sound pattern. 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.