This is a Rectify Series drop-in speaker system for Walthers Proto (QSI) H10/12-44 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 is a beautiful press-fit between the frame members and no modifications are needed to replace the factory speaker. Requires removal of the QSI decoder and a decoder installation using a Nix Trainz Decoder Buddy motherboard or a hardwire decoder installation.
The speaker comes fully assembled and tested.