ESU 50328 Two Round Speakers with Common Sound Chamber
ESU LokSound Specific Information
Speakers for Decoders with LokSound V4.0 and LokSound micro V4.0 When selecting the loudspeaker the used decoder type is important. Depending on the decoder, different loudspeakers can be used as follows: LokSound V4.0, LokSound micro V4.0 and LokSound V4.0 M4 decoders need the new speaker with an impedance of 4 Ohms. With the present 100 Ohms loudspeakers you would hardly hear anything.
Conversely, you must never use the new 4 Ohms speakers with the previous LokSound V3.5 decoder that uses 100 Ohms decoder. The decoder could be destroyed! When the decoder is replaced, the speaker must be changed as well.