These are Rectify Series drop-in speaker systems for Athearn 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.
 
Two rear-mount versions are available:
• AHRR-SD50-RC1 for early-run, pre-sound SD50/60s
• AHRR-5060-RC1 for current-run, sound-ready SD50/60s
 
The AHRR-SD50 uses mounting-tape to mount and no frame modifications are required.
 
The AHRR-5060 uses the stock mounting-screws with no modifications required.
 
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 speakers come fully assembled and tested.
 
Dimensions are:
AHRR-SD50 - 16mmH x 18mmW x 55mmL
AHRR-5060 - 18mmH x 18mmW x 51mmL
 
VIDEO: https://youtu.be/qf5HoRAuKdg