This is a Coeval Series drop-in speaker system for Atlas Classic & early-run Master SD-35 locomotives. The speaker is a beautiful press-fit between the rear weight and motor mount. No frame/weight/shell modifications are needed! The factory PCB will need to be removed with a hardwire decoder installation.


The speaker comes fully assembled and tested. Please choose 4Ω (Loksound) or 16Ω (Soundtraxx) wiring.

CO-Atlas Classic/Master (early) SD35


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