[. . . ] 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 Net weight Shipping weight Enclosure material Finish Grille Handles Warranty Optional Accessories Wheel kit The woofer uses a long excursion voice coil to guarantee low distortion even at high drive levels. The 100mm sandwich-type voice coil is extremely robust and withstands extremely high power peaks. The cabinet is equipped with an electronic circuit called VOICE COIL TRACKING PROTECTION. This circuit senses the terminal voltage of the transducer and simulates the thermal behaviour of the woofer's voice coil. a recessed pole-mount flange allows easy speaker-on-a-stick applications. 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. An optional wheel-kit with four castors is available for portable applications and can be screwed-on at the rear side of the cabinet. [. . . ] Please always consult a certified structural engineer for correct and safe setup methods. [. . . ]