This is a Rectify Series drop-in speaker system for Atlas Master HH600/660 (QSI) locomotives. The speaker features a notch to properly locate the front LED headlight directly behind the shell's lens. The speaker mounts in the factory location with the screws used to hold the stock speaker or weight and requires removal of the QSI sound and a new decoder installation. For decoder installations, the Nix Trainz Decoder Buddy Mini or TCS AS-MB2-NC 21-pin motherboards may be used or a hard-wired installation.
The speaker comes fully assembled and tested.