This is a Rectify Series drop-in speaker systems for early Athearn Genesis SD70ACe locomotives. The AHGS-SD70-RC1 speaker fits behind the cab. The speaker replaces the stock speaker/weight. A single screw-removal is all that is needed to remove the stock speaker/weight. This system then simply drops-in with small strips of carpet-tape or a touch of adhesive keeping it in place.
 
If you have the newer/currnt-run Genesis 70ACe, it may use a rectangular speaker in the rear. The AHGS-UNI2-RC1 speaker fits these versions.
 
The speaker comes fully assembled and tested.
 
Overall dimensions are: 30mmH x 15.5mmW x 28mmL
 
VIDEO: https://youtu.be/VfmXaJe7SCs