Speakers for Decoders with LokSound V4.0 and LokSound micro V4.0LokSound V4.0 and LokSound micro V4.0 decoders need the a speaker with an impendance of 4 Ohms. With the present 100 Ohms loudspeakers you would hardly hear anything.Conversely, you must never use a 4 Ohms speakers with the previous LokSound V3.5 decoder. The decoder could be destroyed! When the decoder is replaced, the speaker must! be changed as well.
If you are not sure about which loudspeaker fits into your loco we generally recommend to open the loco and measure the dimensions with a ruler.Diameter:2x16mmDepth of Sound Chamber:8,1mm