These are Rectify Series drop-in speaker systems for late and current-production Atlas Master Dash 8-32/40B 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.
 
For the QSI-era frames, the ALMA-QSI1 rear-mount speaker mounts in the a-frame over the drive shaft with a touch of adhesive. No modifications are needed to install.
 
For current-run frames, the ALMA-UNI1 "deck-mount" fits in the rear position in place of the stock speaker using mounting-tape or a strap of tape over the top.
 
Both models have the option of adding the front-mount UFIT-2318 speaker.
 
The speakers come fully assembled and tested.