the box 18LB100-4N Ersatzspeaker 18" – Thomann France
D.C. AUDIO - DIFFUSORE TRE VIE FULL RANGE REFLEX DR0211 MONTA : 1 CONO 18" THE BOX SPEAKER 18-500/8-A (600W-RMS) 1 CONO 10" THE BOX SPEAKER 10-250 (250W-RMS) 1 COMPRESSION DRIVER 1"
the box Speaker 18-500/8-A Free-Air-Action - YouTube