M1220
(1.1E)
1220-CO controls & indicators
GR LO
ISP
GR HI
OV LO
OV HI
CUT
MON
LFC
MUTE
1220-CO
0
+3
-3
0
-6
-12
-18
dB
HI dB
ID
1220-CO rear panel
O U T P U T 2
O U T P U T 1
1220
P I N A S S I G N M E N T
A L O W O U T +
B L O W
O U T
-
C S P E A K E R
I D
D S P E A K E R ID
E S E N S E D R I V E +
F S E N S E D R I V E -
G H I G H O U T +
H H I G H O U T -
1220-CO Controls and indicators
Standard setting
On the top left of the module front panel are three configuration
switches. Yellow LEDs next to each switch illuminate when a switch
is selected. With no configuration switches selected, the connected
1220 loudspeakers will operate as a main, front-of-house system
without subwoofer support. When using a mixture of F1220 and
M1220 cabinets front-of-house, the greatest compatiblity in the mid
to treble range is obtained with no configuration switches selected.
A more balanced bass response is obtained when the cabinets are
deployed as a twin cabinet cluster or operated in half space,
placed on a stage or mounted on a wall.
CUT switch and indicator
With the CUT switch selected, the frequency and phase response of
1220 loudspeakers is modified for operation with d&b B1-SUB,
B2-SUB or E18-SUB active subwoofer systems.
MON switch and indicator
With the MON switch selected, the controller module is configured
to drive the M1220 stage monitor. The MON setting introduces a
1.5 dB lift between 500 Hz and 3 kHz. The CUT and LFC switches
function whatever the setting of the MON switch. The MON switch
should not be selected when driving the F1220.
LFC switch and indicator
LFC stands for "low frequency correction". With the LFC switch
selected, bass level boost is applied to compensate for the LF loss
encountered when cabinets are deployed in full space e.g. flown.
The LFC switch is automatically disabled when CUT is selected.
HI level control
The HI level control has a +/3 dB range and cuts or boosts HF
response above 1 kHz. For a linear frequency response, the HI
level control should be set to the 0 dB position.
Controller module rear panel
Two 8-pin, identically wired, CA-COM output sockets are fitted to
the module rear panel. To avoid a potential shock hazard, if a
single 1220 loudspeaker is connected, the pins on the unused
socket are internally isolated from the mainframe power amplifier
outputs.
Internal speaker wiring
When replacing the 12 driver, ensure that the red lead is
connected to the black terminal on the driver, and vice versa. The
HF driver is wired normally - red lead to the red terminal.
