B&C 21SW152-4 "Othorn" Hochleistungs-Hornsubwoofer 21" | 900 EUR - Gebrauchte-Veranstaltungstechnik.de - Der Marktplatz für gebrauchte Veranstaltungstechnik
othorns - Speakerplans.com Forums
Large Horn Subwoofer Build - Cal Bryant
Update: The cheapest sub I've ever bought. We built a new cabinet, loosely based one the original. Got a building fever going and want to build subs (18"), any suggestions? : r/SoundSystem