User manual

MAX Data Sheet MAX
2 WAY
ACTIVE
MUTE
ampMAX
-12
-6
+6
0
-12
-6
+6
0
CUT
CH A / LOW
CH A
ACTIVE
LFC
CH B / HIGH
CH B
HF-LEVEL
IS/GR
MUTE
CUT
LFC
IS/GR
Controls on ampMAX module
INPUT A
1+
1–
2+
2–
AMP A
OUT A
INPUT B
1+
1–
2+
2–
AMP B
OUT B
Active
Crossover
Hi
Lo
P1200A with ampMAX, active mode
INPUT A
1+
1–
2+
2–
AMP A
OUT A
INPUT B
1+
1–
2+
2–
AMP B
OUT B
P1200A with ampMAX, passive mode
Operation with P1200A and ampMAX module
ampMAX is a two-channel controller module occupying both slots
of a P1200A mainframe. The combination of P1200A and
ampMAX allows MAX loudspeakers to be driven passively or in 2-
way active mode.
Passive operation
In standard passive mode, ampMAX provides two linear amplifier
channels, each amplifier driving all four pins on the channels
Speakon output connector. Pins 1+ and 2+ carry positive and pins
1– and 2– carry the negative components of the signal. Two MAX
cabinets can be driven by each P1200A amplifier channel.
MAX can also be used with the E15-BX bass extension cabinet. The
E15-BX cabinet is equipped with a passive crossover network and
simply connects in parallel with the MAX cabinet without the need
for any additional control electronics. One MAX and up to two
E15-BX cabinets can be driven by each P1200A output channel.
2-way active operation
The ampMAX module contains a switchable electronic crossover
which routes seperate LF and HF signals to the P1200A amplifier
channels. Pins 1+/1– of both loudspeaker outputs carry the LF
signal, 2+/2– carry HF signal. The output connector pin assignment is
changed automatically when active operation is selected. The input
signal is fed to INPUT A, INPUT B is not used.
A P1200A mainframe can drive two MAX loudspeakers in active mode,
the extra headroom gained serves for the most demanding monitor
applications.
When MAX systems are used as downfills or frontfills for C4
Systems passive operation is recommended. In active mode the
phase response of MAX is not compatible with C4 systems.
ampMAX module switches
2-WAY ACTIVE
switch and indicator
Selecting this switch configures the P1200A for active operation of
MAX cabinets - channel A drives the 15" LF loudspeaker, whilst
channel B drives the 2" HF driver. The yellow LED next to the switch
illuminates to indicate active mode.
The left volume control (CH A / ACTIVE) now controls both channels
and sets the overall level, the right volume control (CH B / HF-LEVEL)
sets the relative HF level.
CUT switch and indicator
Set to CUT, a high pass filter with a 130 Hz cut-off frequency is
inserted in the controller signal path. The yellow CUT LED
illuminates. MAX is now configured for use with d&b C-Series
active subwoofers. In active mode only the channel A CUT switch
is functional.