[. . . ] Reproduction or publication of the content in any manner, without express permission of the publisher, is prohibited. [. . . ] Therefore this speaker is intended for indoor use only, use of this product outdoors, in humid conditions, voids all warranties. This is potentially dangerous and should only be carried out by technicians who have perfect knowledge of the techniques and regulations of rigging speakers!NEGATIVE = -1 Attention: when a second speaker is connected, the impedance drops from 8 to 4!However, if your amplifier supports 2 loads, you can connect up to 4 cabinets to each amplifier output. Cables to be used: You can use readymade cables such as our JB SYSTEMS codes 2-0505 (5m) or 2-0510 (10m) or 2-0525 (25m). Be sure to connect the same colour on each side of the cable to the corresponding contact!If you inverse the conductors, poor sound quality with a lack of low frequencies will be the result. For this purpose you can use heavy duty eyebolts with metric M10 thread (not supplied). [. . . ] Stevige, houten MDF klankkast Harde polyurethaan verf voorkomt krassen Perfect voor permanente installaties Perfect voor mobiel gebruik High power 15" Woofer met ALU frame High power 1. [. . . ]