This is a Rectify Series drop-in speaker system for BLI RSD-7/15 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 replaces the factory's round speaker-frame and uses a touch of adhesive to mount. No modifications are needed to replace the factory speaker.
 
The speaker comes fully assembled and tested.
 
Dimensions are: 32mmH x 16mmW x 30mmL