Technical Notes
Safety steels may be used only with the M10 threaded inserts. M6 or M8 threaded inserts in the rear are to be used exclusively with DAL original accessories or are designed as lashing points. After use, make sure that the countersunk screws belonging to the cabinet are screwed back into the threaded sleeves in order to maintain an air-tight system.
DAL protective grilles with foam lamination are the mechanical protection component for the built-in transducers and offer a high acoustic transmission as well as their affixing minimizes sonic influences of the grilles. The backing or covering of the grilles with foam serves also as UV-light protection, dust protection and improves the optical unobtrusive of the systems. Only undamaged grilles and foams can fulfill these tasks. Replace warped grilles or worn foams to maintain their function.
By turning the hi-driver/horn unit in the cabinet, you change the horizontal and vertical acoustic radiation characteristics of the i15N. First remove the protective grille. To do this, remove the M4 TX20 countersunk screws on top and bottom and clear away the grill. Remove the 8 M4 TX20 screws of the hi-driver/horn unit. Pull the Hi-Driver/Horn unit a few centimeters out of the cabinet and turn it 90°. Refit the Hi-Driver/Horn unit, taking care to ensure an airtight seal in the groove. Then attach the protective grille back. Mark the loudspeaker with the changed radiation pattern.
DAL loudspeaker systems with Poly Urea-coated or painted enclosures are basically suitable for temporary outdoor operation, even in the rain.
For indefinite operation outdoors as in fixed installations, the loudspeaker systems must be protected with a hood against direct sunlight and rain. If necessary, the loudspeaker should be equipped with the optional front grille with weather protection.
Most DAL loudspeaker systems can be supplied for extra charge from the factory in a weatherproof (WR) or sea-weatherproof (SWR) variant.
For indefinite operation outdoors in subtropical and tropical areas, the loudspeaker should be ordered as the WR variant. For indefinite operation at sea and other areas with a humid and salty atmosphere, the loudspeaker should be ordered in the SWR equipment variant. Both variants are manufactured at the factory only.