KLING & FREITAG K&F ACCESS T9 - Manual (Page 52)

User’s Manual ACCESS SYSTEM
KLING & FREITAG GMBH ©1995-2009 Version 6.0, 17.03.2009 Page 52 of 60
3. When clustering in several levels, make sure that the mid-high and bass systems are
set up in a chequered pattern. 4 mid-high systems should never be set up directly to
one another. This set-up would lead to uncontrollable interference in the low-mid
range:
T5/9 T5/9 T5/9
T5/9 B5 T5/9 T5/9
B5 B5 B5 B5
T5/9 B5 B5 T5/9
B5 T5/9 T5/9 T5/9
T5/9 T5/9
T5/9
T5/9 T5/9
B5 B5 B5 B5
B5 B5 B5 B5
4. Always align the ACCESS System vertically so that the top speaker is aimed towards
the back row of the audience. By doing so, the sound pressure will always reach as
deeply as possible into the far field. As a further step in effectively covering the far
field, the mid-high systems which target the furthest audience members should only
be slightly tilted so that a summation of sound pressure can be achieved in the
back.
When considering the near field, make sure that the front listeners are within the
coverage range of the lowest mid/high system.
When the number of basses is doubled, the volume of clustered basses can in-
crease by max. +6dB (+3dB efficiency and +3dB from doubling the amplifier’s
power). The volume of the top speakers increases not in the same manner as de-
scribed above because of the different dispersion pattern.
The position of a bass speaker has a large influence on the actual volume. A bass
speaker on the floor can be a few decibels louder than a flown bass system.
For these reasons, the number of necessary bass systems can vary greatly from case
to case. For large configurations, a ratio of one bass speaker B5 to one top speaker
is generally necessary. For smaller uses (i.e. 1-2 tops per side), a ratio of 2 bass sys-
tems B5 to 1 top is sufficient --- especially when the bass systems are flown.