[. . . ] We expressly point out that the relevant safety regulations must be observed for , , flying" loudspeaker systems. [. . . ] Connectors SUB Wired through Connector model Dimensions (WxHxD) mm Shipping weight Net weight Enclosure material Finish Grille Handles Rubber feet Warranty Optional Accessories SH-112 Dust-Cover for SUB 1. 15 The conical vent system shows significantly less distortion and lower air noise at low frequencies than common circular vent openings. You just have to connect the SUB 1. 15 and the D 8 with a regular Speakon cable in parallel. Please always take care that every speaker stack has been mechanically secured against accidental falling down. Please always consult a certified structural engineer for correct and safe setup methods. [. . . ] Please always take care that every speaker stack has been mechanically secured against accidental falling down. [. . . ]