This is a Rectify Series drop-in speaker system for Athearn Genesis GP38/39/40/49/50 locomotives. More than just a box, the enclosure features Diapasonic Tuning™, which allows the lower frequencies to accurately develop and resonate, clears the midrange of excess resonance and tunes the upper-mid/high response. The speaker uses the factory mounting screws and no modifications are needed to replace the factory speaker.
 
The speaker comes fully assembled and tested.
 
Dimension: 17mmH x 18mmW x 46mmL
 
VIDEO: Loksound: https://youtu.be/go3Hbl6MRv4