This is a Coeval Series drop-in speaker system for Scale Trains C39-8 locomotives. The speaker is a press-fit into the cavity and no modifications are needed to replace the factory speaker.
The speaker comes fully assembled and tested. Please choose 4Ω (Loksound) or 16Ω (Soundtraxx) wiring.
Dimensions are: 12.5mmH x 16.5mmW x 25mmL