This is a Rectify Series drop-in speaker system for Bowser Executive F-Units. 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. No modifications are needed to replace the factory speaker. Use a bit of double-sided mounting tape to secure the speaker to the frame.
 
The speaker comes fully assembled and tested.
 
Dimensions are: 9mmH x 27mmW x 39mmL
 
VIDEO: https://youtu.be/Ir3ox7NiADk