Specifications

MAX12 Data Sheet MAX12
2 WAY
ACTIVE
MUTE
amp
MAX
-12
-6
+6
0
-12
-6
+6
0
CUT
CH A / LOW
CH A
ACTIV E
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 and MAX12 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
MAX12 cabinets can be driven by each P1200A amplifier channel.
MAX12 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 MAX12 cabinet without the
need for any additional control electronics. One MAX12 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 or MAX12 loudspeakers in
active mode, the extra headroom gained serves for the most
demanding monitor applications.
ampMAX module switches
2 WAY ACTIVE
switch and indicator
Selecting this switch configures the P1200A for active operation of
MAX12 cabinets - channel A drives the 12" 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. MAX12 is now configured for use with d&b C-Series
active subwoofers. In active mode only the channel A CUT switch is
functional.