31
MULTIPLE ARRAY (>100° horizontal coverage)
When the horizontal coverage of a TTL33-A/TTL31-A array (100° nominal) is not suffi cient, it is not recommended to place a
second array directly beside the fi rst one. The best approach is to utilize a second array which is focused on another portion
of the audience (typically at 60° - 100° relative to the fi rst array) and spaced at least 6-7 meters (approximately 20 ft) from
the fi rst array. By focussing main and offstage fi ll arrays at different panning angles, audible comb fi ltering interaction is
lessened since the overlap region between the two arrays is reduced. The main L/R FOH arrays are normally physically larger
than the offstage side fi ll arrays and act as the reference for time alignment. Typically, a side fi ll array is delayed with respect
to the FOH array. To geometrically improve time alignment in the overlap region between the main and offstage arrays, the
location of the offstage array should follow the arc of a circle with the radius of the circle at upstage centre.
The offstage fi ll system should be time aligned towards the direction where both array produce equal level. Time align-
ment of a horizontal array.
The delay time value ∆t is equivalent
to the physical offset ∆x divided by the
speed of sound (i.e. 343 m/s)
Time alignement of a horizontal array
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