Upgrade to a premium DCCSound speaker 
Specifically designed for Bachmann's 2022 re-tooled Class 37 model. 
Kit includes:
Sugarcube style speaker with 13x18mm sugarcube driver. 67 mm x 23 mm x 10 mm
Enclosure for Bachmann 28mm roundspeaker (the factory speaker driver is re-used)
Nominal power output of speaker set: 3 W
Impedance: 4 Ohms (when wired in parallel by installer)
Model and 28mm speaker driver for illustrative purposes only