The grid also has rigging track on the middle crossbar that runs side to side that matches the track on the rear of the enclosures. Either the Electro-Voice Xvhg grid hinge or the Xvhl linking hinge may be used to attach the rear of the top box to the grid. There is a pad eye on the bottom of the rear crossbar of the grid that may be used for an optional pull-up from the bottom enclosure.
The grid is suspended over head by attaching two hoist motors to the two swivel rings on the top of the grid. The swivel rings are mounted on hangers that are in turn attached to the center bar of the grid that runs front to back. These hangers can be secured to the center bar at different locations. Changing the position of these hangers adjusts the load on the front and back hoist motors suspending the grid.
The ATM Flyware X-Line Grid was designed to suspend a column of X-Line loudspeakers with a maximum weight of 3400 pounds (1542 kg). When using the grid, always follow the manufacturer’s instruction, recommendations and safety precautions, and never exceed any structural limits specified by ATM Flyware.
1.7 RS-1B Double-Stud Rigging Fitting
For special lightweight applications, the Electro-Voice RS-1B double-stud swivel-ring fitting (shown in Figure 4) may be useful for rigging X-Line loudspeaker enclosures. (The RS-1B is similar to the New Haven NH32102-2 double-stud swivel-ring fitting.) This fitting may be used on custom wire-rope assemblies for attachment to either the front or the rear of the enclosure. The reader is cautioned that the standard double-stud fittings ARE NOT AS STRONG as the Xvsl, Xvsg, Xvsd or Xvsf front rigging or the Xvhp, Xvhg and Xvhl rigging hinges. (See Section 3. Rigging Strength-Ratings, Safety Factors and Special Considerations for a detailed discussion of the structural strength of the RS-1B fittings and the rigging hinges.)
RS-1B fittings would most commonly be used for a pull-up assembly for a column of X-Line. Attach two RS-1B fittings to the rear rigging track on the back of the bottom enclosure. Attach a ratchet strap to the grid for the pull up. Then create a bridle between the two RS-1B fittings that is attached to the ratchet strap. This assembly should only be used for columns of eight enclosures or less. For larger arrays, use the Xvbp pull-up bar.
To attach the double-stud swivel-ring fittings to the enclosure rigging track, grasp the fitting between the thumb and first two fingers. Push in the spring-loaded safety locking pin with your free hand and lift the outer locking ring over the pin by pressing with your thumb. Continue to press with your thumb until the two legs of the fitting are fully exposed. Insert the two round feet on the end of the legs into the round cutouts in the track and slide the fitting to the desired position. Center the main body of the fitting over one of the track cutouts, with the feet located on either side (i.e., the feet positioned directly under the teeth of the track). Release the outer locking ring. The round protrusion on the bottom of the fitting should lock into the round cutout in the track, with the locking ring retracting to its normal position, allowing the safety pin to reappear and extend over the locking ring. If the fitting does not lock into the track, nudge it along the track and wiggle as necessary until it settles into position. If the outer locking ring does not fully re-tract, push the ring towards the track until the safety pin reappears and extends over the locking ring. When locked, the fitting will be immovable in the track and the locking ring of the fitting may not be lifted. To remove the fitting, reverse the procedure.
ALWAYS CHECK TO MAKE SURE THAT THE DOUBLE-STUD FITTING IS SECURELY LOCKED INTO THE TRACK, AND THAT THE SAFETY PIN IS EXTENDED OVER THE LOCKING RING BEFORE LIFTING ANY LOUDSPEAKER ENCLOSURE OVERHEAD.
