This is a Rectify Series drop-in speaker system for most Rapido FP7/9 locomotives. No modifications are required to replace the factory speakers. I used double-sided carpet tape to adhere the speaker to the chassis.
 
NOTE: some early-run FP79s used round speakers. Please check your frames to see which versions you have. For these early versions UFIT-27D9 speakers will work; one in the A-units and two for B-units.
 
The speaker comes fully assembled and tested.
 
Dimensions are: 14mmH x 30mmW x 68mmL
 
VIDEO:  https://youtu.be/cCe0R6V7tjw