This 0.94" x 2.17" x 0.34" (24mm x 55mm x 8.6mm) 4 ohm loudspeaker module is suitable for large tenders with gauge HO or OO or models with gauge 0. Its built-in passive radiator in conjunction with the built-in broadband loudspeaker results in good bass reproduction without neglecting the highs and mids. Especially for diesel or steam locomotives, this module is a real alternative for those who like deep bass, but do not need extreme volume. The loudspeaker fits perfectly with our LokSound 5 or LokSound 5 L decoders.