The first run 930 class comes with 25mm diameter speakers. The sound output from the model can be dramatically improved by installing a custom DCCSound twin sugarcube speaker, featuring twin 13x18mm sugarcube speaker drivers and a custom enclosure designed specifically for this model. The 930 below received an upgraded speaker, while the customer sought to hardwire a LokSound 5 decoder into the model. The decoder featured the latest 930 class sound project from DCCSound.
Please note that with the speaker as pictured below installed, the speaker at the #2 end under the radiator fan should be removed or disconnected from the decoder/motherboard.