3
a small enclosure size. It is suitable for a wide variety of tasks,
such as near field monitoring, mobile vans, broadcast and TV
control rooms, surround sound systems and home studios. The
advanced Directivity Control Waveguide™ (DCW™) technology
provide excellent frequency balance even in difficult acoustic
environments.
Amplifiers
The amplifier unit is mounted in the rear of the loudspeaker en-
closure. The unit incorporates special circuitry for driver thermal
overload protection. Variable input sensitivity allows accurate
level matching to console output section.
Using the Loudspeakers in Stand-Alone
Mode
The 1238CF accepts both analogue line level input signals and
AES/EBU formatted digital input signals.
When the loudspeakers are not connected to a Genelec loud-
speaker control network, they operate in stand-alone mode.
However, settings made with the Genelec Loudspeaker Manager
software can be saved into each loudspeaker and applied even
when the network is disconnected by setting switch 1 “STORED/
MANUAL CONTROL” on switch group 2 of each loudspeaker to
position “STORED.”
This manual concentrates on using the loudspeakers without the
control network. All issues concerning use with the network are
explained in detail in the System Operating Manual provided with
the GLM™ Loudspeaker Manager software kit.
Connections
Each loudspeaker is supplied with a mains cable, one 5 m GLM
network cable and an operating manual. Before connecting up,
ensure that the mains switch is off.
“MAINS INPUT” Connector
Connect the mains supply to this connector.
“DIGITAL IN AES/EBU” Connector
Use this female XLR connector for AES/EBU formatted digital
audio input signals. This input is selected automatically when a
valid digital audio signal is present, and overrides the analogue
input.
Depending on the digital hardware, transmission of a 192 kHz
sample rate is achieved using a double speed, single channel/
cable interface. This is called dual-wire mode. In this case one
cable per channel is used and no channel selection is required.
Dual-wire mode is automatically detected by the input stage.
If the digital source device has a digital level monitor pot or
graphical volume fader that controls the digital level, it may be
advantageous to lower the level control either on the GLM soft-
ware interface or the loudspeaker’s back panel controls rather
than the source device, which in turn will force the use of more of
the digital [bit] resolution in the volume control.
If the digital input is used, audio levels are referenced to 0 dBFS
(digital Full Scale, the largest level that may be represented in
the AES/EBU signal). Genelec DSP loudspeakers produce 100
dB SPL at 1 meter in free space for a digital input signal of –30
dB FS. It is advantageous to keep the digital level as high as
possible.
“DIGITAL THRU AES/EBU” Connector
This male XLR carries an unaltered copy of the digital signal fed
into the “DIGITAL IN AES/EBU” connector. It can be used for
daisy-chaining up to four loudspeakers together.
Figure 1. Connectors and
controls on the back panel
of the 1238CF.
2
1
ON
OFF
ON
OFF
dB
-2
-4
-8
-6
-12
0
-10
SWITCH
1
MANUAL
CTRL
-4 dB
160 Hz
ON + ON
OFF + OFF
-6 dB
-6 dB
-2 dB
STORED
DESKTOP
-2 dB -4 dB
BASS
ROLL-OFF
BASS
TILT
-2 dB -4 dB
+2 dB -4 dB
TREBLE
TILT
ON
OFF
SYSTEM LVL.
AES/EBU CH.
A
B
WF
COAX
DRIVER MUTE
SWITCH
2
-10
-20
dB
-30
SUM A AND B
MADE IN FINLAND
1238CF DSP TRI-AMPLIFIED
MONITORING SYSTEM
MAGNETICALLY SHIELDED
SERIAL NUMBER
MAINS INPUT 230 V~
50 / 60 Hz 330 W
DIGITAL IN
AES/EBU
www.genelec.com
29
2-
12
38
T-
6
ANALOG
IN
DIGITAL THRU
AES/EBU
12 V
REMOTE
STAND-ALONE USER
INTERFACE LEVEL CONTROL
STAND-ALONE USER
INTERFACE SWITCH
GROUPS 1 AND 2
GLM CONTROL
NETWORK
CONNECTORS
MAINS POWER
SWITCH
MAINS INPUT
CONNECTOR
ANALOG INPUT CONNECTOR
DIGITAL THRU CONNECTOR
DIGITAL INPUT CONNECTOR
12V REMOTE
CONNECTOR
