User manual

Standard controls,
F2 controller module
GR LO
ISP
GR HI
OV LO
OV HI
CUT
MUTE
F2-CO
0
-6
-12
-18
dB
ID
0
-2
-4
-6
HI dB
3-2 A1 User Manual
drivers in the F1220 and F2 speaker cabinets. Each signal path,
high & low, uses equalisers and limiters specifically adjusted to the
electroaccoustic requirements of the different speaker designs.
HF Level setting
As well as an overall level control, both active system controllers,
1220 and F2, provide a front panel HF level control to fine tune
the balance between the cabinet high and low drivers at different
listening distances. The 1220 HF level control has a +/- 3dB range
while the F2 HF level control has a 0dB to - 6dB range.
3.2. Controls & indicators
This section describes the controls & indicators common to all
A1controller modules. Loudspeaker specific controls and indicators
are explained in section 4 of this manual
Loudspeaker systems.
OV HI/LO - Overload (red)
On.
Illuminates when an overload occurs in the signal path
(input signal too high)
On.
Illuminates when the controller limiters reduce gain by
more than 12 dB (input signal too high).
On
. Illuminates when the amplifier gain is reduced because the
output current is too high (e.g. perhaps due to a cable or
connector short circuit).
GR HI/LO - Gain Reduction (yellow)
On.
Illuminates when the controller limiters for the channel
indicated reduce gain by more than 3 dB.
ID - SPEAKER ID (green)
Off.
No speaker is connected to the output. Internally, the
mainframe power amplifier outputs are isolated from the pins
of the rear panel speaker output connector(s).
On
. One, or in the case of the 1220 system, two loudspeakers
of the correct type are connected to the mainframe speaker
output(s). The system is ready to operate.
Flashes
. Either one or two loudspeakers of the wrong type
have been connected to the mainframe speaker output(s). The
speaker outputs are disabled - internally isolated from the
mainframe power amplifier outputs.
ISP - Input Signal Present (green)
ON.
Illuminates when the signal presented to the controller
input exceeds a -36 dBu threshold value. The ISP circuit is
unaffected by the setting of the controller mute switch and level
control.