EAW KF750 Series, Touring Usage Manual

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Much like the downfill processing, KF755 upfill processing allows for the integration of KF755’s into a KF750
cluster without modifying the KF750 processing. Once again this results in some unconventional processing.
The main KF750 array provides more than adequate LF information and projection to the upper seating, and
the upfill merely provides the information that is missing. Therefore only two channels of processing are required
for optimal upfill integration. In default upfill settings, the KF755 upfill modules are high passed at 350Hz and
provided with high frequency equalization to counteract air absorption in typical venues.
In medium (13,000 seat) arenas, a single row of inverted KF755’s is adequate to provide appropriate upfill
projection. In larger arenas (18,000+), two inverted rows are more appropriate to provide upfill at 300 feet.
In either case, the upfill modules must be delayed so as to sum with the energy from KF750 column.
2 rows of upfill KF755's
in a large arena
1.237 msec & 1.756 msec
delay differential
A
B
C
Arrival difference from A to B – 1.237 msec
2x KF755 (inverted)
4x KF750
1x KF755
2x SB750
Arrival difference from A to C – 1.756 msec
1 row upfill KF755's in a medium arena
0.3 msec
arrival difference
1x KF755 (inverted)
4x KF750
1x KF755
2x SB750
Default processor settings apply system delay to KF755 upfill modules based upon assumed typical balcony
locations and throws as described in Section 4. Acoustical analysis systems, such as SIA-SMAART, aid in the ability
to fine tune these parameters. If, however, balcony position and throw distances are typical and appropriate
processing is being utilized, then KF755 upfill integration should be readily achieved through the use of
default settings.
Each row of inverted KF755’s requires two processing outputs with each row seeing different delay settings so as
to sum coherently in the balcony. Thus two rows of inverted KF755’s require four processing outputs. However,
another approach eliminates two of the four.