This is a Rectify Series drop-in speaker system for Athear RTR SD50/60 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 a touch of adhesive to mount and no modifications are needed to replace the factory speaker.
You can choose to install a front-mounted speaker just within the cab for better horn/bell localization. The speaker isn't visibile in the cab and this keeps the dynamic brake detail in place with the see-through grills.
The speaker comes fully assembled and tested.
Dimensions are: 16mmH x 18mmW x 55mmL