Tang Band's T0-2008S features a passive radiator-assisted 20.1 mm driver that plays from 200 to 20,000 Hz in a tiny 2.17" by 0.94" package. This speaker is great for S scale locomotives, along with HO wide body diesels (F units, PA’s, etc) and steam locomotives with large tenders.

Tang Band's T1-1925S features a passive radiator-assisted 25.4mm driver that plays from 150 to 20,000 Hz in a tiny 65x29mm package. This speaker is great for S and O scale locomotives, along with HO wide body diesels (F units, PA’s, etc) and steam locomotives with large tenders.

Tang Band's T1-1931S features a passive radiator-assisted 1" driver that plays from 105 to 20,000 Hz in a tiny 3.5" x 1.44" package. This is a perfect speaker for O scale locomotives, with high volume capabilities and loads of bass.