Quick demo of my Heljan class 20 fitted with 2 round bass reflex speakers and Zimo MX696S loaded with Paul Chatter sound file. WARNING this may make your laptop or phone speakers distort, it's not the loco speakers that are distorting. Sounds best through a good quality pair of headphones or audio system. NB the sunlight and my phone's camera make the weathering look a strange colour, it isn't.......