ESU HO 50331 Loudspeaker 20mm, round, 4 ohms, 1~2W, with sound chamber
Loudspeaker 20mm, round, 4 Ohm, 1-2W, with sound chamber. LokSound V4. 0 and LokSound micro V4. 0 decoders require the new speakers with 4 ohms impedance. With the previous 100 Ohm speakers you will hear hardly anything.