You must use a correctly rated speaker with their decoders! If the decoder is rated for a 32 Ohm speaker, using a speaker with a different rating may cause sub-optimal performance.

All speakers need speaker enclosures to generate enough sound volume for you to hear them. Some locomotives have these built in and others do not. If the loco where the sound decoder is installed does not have a speaker enclosure, you will need to add one in order to be able to hear the sounds.

Fits many N & HO Scale installations. Used on current production SDN144A0, SDN144A1 & SDN144PS sound decoders.