These are Rectify Series drop-in speaker systems for Athearn RTR SW1000/1500 locomotives.
 
The AHRR-1500 speaker is for the pre-sound versions and uses the front PCB mounting screw. The only modifications required are to nip-off three little unused plastic nubs on the inside of the shell. Room is provided for front lighting. Decoder installation is simple with a Nix Trainz Decoder Buddy (available here https://www.scalesoundsystems.com/product-page/nix-trains-decoder-buddy-motherboard) and 21-pin decoder or by hardwiring a decoder.
 
An insallation guide is available under the "Guides" tab or here: https://docs.wixstatic.com/ugd/7e84c8_d8dbe7baa65142ff9c11843937397eb2.pdf
 
The AHRR-15X2-RC1 speaker is for current-run sound-equipped models and simply replaces the stock speaker but with greatly improved fullness and detail. NOTE: the DCC-Ready models I have seen do not come with a dummy weight or enclosure and have no mounting-screws. The screw size is M1.6x4 if you have or would like to source them yourself. You can also add a pair of screws for $1 if you need me to supply them.
 
The speakers come fully assembled and tested.
 
Dimensions:
AHRR-1500-RC1: 8mmH x 17mmW x 26mmL
AHRR-15V2-RC1: 10mmH x 17mmW x 22mmL
 
VIDEOS:
LokSound Select: https://youtu.be/YRGl9axHlJw
LokSound 5: https://youtu.be/D0bZp2Rmj6Q
Tsunami2: https://youtu.be/KMXvrutpMUQ
WOWSound: https://youtu.be/JxYU-034CTo