7
All default delay settings are configured to allow users to fine-tune delay at FOH. Downfill delay and gain can be
simply adjusted and tuned by ear. Coherent summation is a very audible phenomenon. Acoustical analysis
systems, such as SIA-SMAART, aid in the ability to fine tune these parameters. If FOH location and trim height are
typical and appropriate processing is being utilized, then KF755 integration should be as simple as powering up.
III – Using SB750’s
Virtually all pro audio applications require sub bass reinforcement and a ratio of at least one SB750 per every two
KF700 array modules is the rule of thumb. The SB750 offers users the flexibility of stacking subwoofers on the
ground or flying them with the array. Users can insert flown subs as rows above and/or below the main array, or in
columns along the off-stage side of the main array. (Inserting flown subwoofers directly withing the main array is
not recommended.) Each location has benefits and trade-offs. Most venues require a combination of locations for
optimal performance. In all cases, the subwoofers must be timed for coherent arrival in order to achieve
appropriate summation throughout a venue.
IIIa – Groundstacking SB750’s
Many users will choose to use SB750’s in a traditional groundstacked configuration. In addition to providing even
sub bass coverage throughout a venue, this technique also provides maximum sub bass impact in the front rows,
a quality many fans have come to expect in high-energy live music performances.
1.169 msec - 0.931 msec = 0.238 msec
Therefore add 0.238msec of additional downfill delay to compensate for 5' of increased trim height
Adding downfill delay to compensate for additional trim height
20'
0.931msec arrival differential at FOH
1.169msec arrival differential at FOH
25'
100'
1x KF755 (inverted)
4x KF750
1x KF755
1x KF755 (inverted)
4x KF750
1x KF755
Default processor settings delay the KF755’s back to the acoustic origin of the KF750 column. As more KF750’s are
used per cluster, the apparent origin of the column moves upward and increased KF755 system delay is added with
each row of KF750’s.
Default processor settings apply system delay to KF755 downfill modules based upon assumed typical trim heights
and FOH locations as described in Section 4. If FOH is atypically close, this delay should be increased. If FOH is
atypically distant, the system delay should be reduced.
Summary of Contents for KF750 Series
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