d&b MAX2 - Manual (Page 6)

2.3. Operation
NOTICE!
Only operate d&b loudspeakers with a correctly configured d&b
amplifier, otherwise there is a risk of damaging the loudspeaker
components.
As an alternative, the MAX2 can be driven by other high quality
linear power amplifiers, providing their output power does not
exceed 800 W into 8 ohms and an additional subsonic filter is
used (25 Hz with 12 dB/octave minimum). Otherwise there is a
risk of damaging the loudspeaker components.
Application Setup Cabinets per
channel
MAX2 MAX2 2
For applicable d&b amplifiers, the controller setup is available in
Dual Channel and Mix TOP/SUB mode.
MAX2 cabinets can also be operated using the LINEAR setup of
applicable d&b amplifiers. However, the MAX2 setup provides
low end equalization and limiter settings specially tuned for MAX2
cabinets used as stage monitors thus providing improved
performance and headroom.
2.3.1. Controller settings
For acoustic adjustment the functions CUT, HFA and CPL can be
selected.
CUT circuit
Set to CUT, a high pass filter with a 130 Hz cut off frequency is
inserted in the controller signal path. The MAX2 is now configured
for use with actively driven d&b subwoofers.
HFA circuit
In HFA mode (High Frequency Attenuation), the HF response of the
system is rolled off. HFA provides a natural, balanced frequency
response when a unit is placed close to listeners in near field or
delay use.
High Frequency Attenuation begins gradually at 1 kHz, dropping
by approximately 3 dB at 10 kHz. This roll off mimics the decline
in frequency response experienced when listening to a system from
a distance in a typically reverberant room or auditorium.
-5
0
5
10
-10
-15
-20
-25
-30
20 100 1k 10k 20k
Frequency response correction of HFA circuit
d&b MAX2 Manual 1.1 en 6