This is a Coeval Series drop-in speaker system for Athearn RTR GP40X locomotives. More than just a box, the enclosure features Diapasonic Tuning™, which allows the lower frequencies to accurately develop and resonate, clears the midrange of excess resonance and tunes the upper-mid/high response. The speaker uses the factory mounting screws and no modifications are needed to replace the factory speaker.


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


Overall dimensions are 15mmH x 17mmW x 50mmL

CO-Athearn RTR GP40X


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