I had a blown speaker in a T5 (Brawa 40003) It has a ESU decoder that supports DCC (at least that is the only protocol that the MS2 is picking up for me). The loco has a box, but no documenation - The Brawa site has a manual at -> https://www.brawa.de/fil...ungen/40000_BRAWA_BA.pdf

Needless to say, the original speaker is open circuit so I can't check the impedance using a multimeter.

Based on the ESU site and that it is a 23mm diameter round speaker, I ordered a 8 Ohm 0.5w speaker. When first installed it worked fine, but a buzzing sound starts after a few seconds on the motor sound. All the other sounds (e.g. whistle and rattling grates) do not have the buzzing sound, but they are loud. I now suspect that the speaker is the wrong impedance.

So, does any one have any thoughts about the correct impedance for this loco?