This is a Rectify Series speaker system for Bowser S8/12 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 double-sided mounting tape or a touch of adhesive to mount and requires removal of the factory PCB and a hardwire decoder installation.
 
The speaker comes fully assembled and tested.
 
Dimensions are: 16mmH x 13mmW x 40mmL