This is a Rectify Series drop-in speaker system for early-run Atlas Master Dash 8-32/40C locomotives. The speaker is a beautiful fit between the front weight and motor mount and uses a touch of adhesive on the feet to secure it to the frame. No frame/weight/shell modifications are needed! The factory PCB will need to be removed. You can use a motherboard+21-pin decoder or a hardwire decoder installation.
The speaker comes fully assembled and tested.
Dimension: 30mmH x 18mmW x 26mmL