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It's easy to fit sound to the class 91 using either one or two speakers. You can place a 22x13x7 speaker over either bogie or both. You can find the sound decoder here.

Before unclipping the body, make sure you remove the jumper cabels or they will be damaged. There is enough space at the non fan end to fit a 25x25x7 megabass speaker and it acts as a nice base to place the decoder. If your loco has a 12 pin blanking plug, you just use the 8 pins that are grouped together and leave the 4 spare pins empty. See a video of it here: Find the sound decoder on our website here.

In this video we show how to fit sound to the Heljan class 25. Find the Heljan class 25 sound decoder here.

In this video we show you how to fit sound to the class 86, using various speakers. Find the decoder here.

This video explains how to use the megabass speakers into the Hornby HST, these speakers work in both the 8 and 21 pin versions of the model. Find our range of HST sound decoders here.