Electro-Voice XLCi Series, Руководство по монтажу

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ELECTRO-VOICE
®
X LC i TM Rigging Manual 9
2. X
LC
i Rigging and Flying Techniques
2.1 Array Considerations
The X
LC i loudspeaker systems have been specifically designed to construct acoustic line-arrays.
Line-array systems typically consist of independent columns of loudspeaker enclosures. The most
common implementation would be a stereo sound reinforcement system with two columns (left
and right). Additional columns of loudspeakers are sometimes added to cover different seating
sections of a venue – seating areas that wrap around the side or back of a stage, for example.
The X
LC
i line arrays will consist of columns of X
LC
i-127 or X
LC
i-127+ 120°H x 7°V full-range
systems. The exact number of X LC i loudspeaker systems in a column will vary depending on the
vertical acoustic coverage required for the specific venue. Furthermore, the relative vertical angles
between the boxes will also depend on the venue’s acoustic coverage requirements. (Acoustic
design techniques are outside the scope of this document and the reader is directed to the X
LC i
modeling software available from the Electro-Voice website for acoustic design assistance.) It is
also possible to construct subwoofer line arrays using the X
LC i-118 systems.
Although the full-range X
LC
i loudspeaker systems shown in Figure 1 are not physically
symmetrical, their acoustical polar responses are substantially symmetrical because the high-
frequency sections are in the center of the enclosures. Thus, stereo left and right arrays, or left-
center-right arrays may be constructed with the loudspeakers in their normal right-side-up
orientation as shown in Figure1.
X LC i-127 AND X LC i-127+ LOUDSPEAKER SYSTEMS SHOULD NOT BE MIXED IN
THE SAME LINE-ARRAY COLUMN BECAUSE THEIR ACOUSTIC TIME AND
PHASE RESPONSE IS DIFFERENT. BOTH THE X
LC i-127 AND X LC i-127+ HAVE
AN INTERNAL CROSSOVER THAT MAY BE SWITCHED IN OR OUT, ALLOWING
THE SYSTEMS TO BE TRIAMPED OR BIAMPED. TRIAMPED AND BIAMPED
SYSTEMS MUST NOT BE MIXED IN THE SAME LINE-ARRAY COLUMN
BECAUSE THEIR ACOUSTIC TIME AND PHASE RESPONSE IS DIFFERENT.
2.2 Rigging an X LC i Array
The X
LC
i loudspeaker systems utilize a rigid rigging system to suspend the enclosures. When
flying an X LC i system, it is recommended that the entire array be assembled in smaller clusters of
two or 3 cabinets rather than one large array.
WHEN ASSEMBLING TWO CABINETS TOGETHER, IT IS RECOMMENDED
THAT THE HARDWARE IS TIGHTENED FINGER TIGHT UNTIL BOTH CABINETS
ARE COMPLETELY LINKED.
First, attach the front and rear connector bars to the top of the front and rear rigging plates located
on the sides of the enclosure using the included hardware, as shown in Figure 5a. Using the
rigging handles, position the cabinet so that the front and rear rigging bolts can be attached to the
second enclosure. To make it easier for the front and rear rigging plates to be attached between
the two enclosures, the bolts and washers should initially only be finger tightened. Once all four
pieces of linking hardware are installed between the two enclosures, the hardware should be
tightened to a torque spec of 70-90 in-lbs (84-108 cm-kg).