4020B
Operating Manual
2
General
The bi-amplified Genelec 4020B is an extremely
compact two way active loudspeaker designed for
fixed installations. As an active loudspeaker, it con-
tains drivers, power amplifiers, active crossover fil-
ters and protection circuitry. The 4020B is designed
for indoor use only, in temperatures between 15 to
35 degrees Celsius and relative humidity between
20 % and 90 %.
The MDE™ (Minimum Diffraction Enclosure™)
loudspeaker enclosure is made of die-cast alumin-
ium and shaped to reduce edge diffraction. Com-
bined with the advanced Directivity Control Wave-
guideTM (DCWTM), this design provides excellent
frequency balance in difficult acoustic environments.
Positioning the loudspeaker
Each 4020B is supplied with an integrated amplifier
unit, mains cable, a 5-pin connector for audio signal
and 12 V trigger voltage, a keyhole type wallmount
and an operating manual. After unpacking, place the
loudspeaker in its required listening position, taking
note of the line of the acoustic axis. The axis should
be pointed towards the center of the listening area.
Connections
Before connecting up, ensure that the loudspeakers
and the signal source have been switched off. The
power switch of the 4020B is located on the back
panel (see Figure 3). Connect the loudspeaker to an
earthed mains connection with the supplied mains
cable. Never connect the loudspeaker to an un-
earthed mains supply or using an unearthed mains
cable. Audio input is via a 10 kOhm balanced con-
nector. The connector also has two pins for 12 V
trigger voltage for power switching. The current fed
into the 12 V trigger connection must not exceed
200 mA. The pin sequence of the connector is
shown in Figure 2.
Connect the signal cable and 12 V trigger volt-
age to the 5-pole plug provided with the loud-
speaker and secure the connections by tightening
the screws on each pole. Push the plug into the
connector on the loudspeaker.
Never connect the 4020B to the loudspeaker
outputs of a power amplifier or an integrated am-
plifier or receiver.
Once the connections have been made, the
loudspeakers are ready to be switched on.
Autostart And Remote Control
The 4020B is equipped with an Autostart function,
which automatically turns the amplifier to Standby
mode if an input signal has not been detected for
approximately 1 hour.
The amplifier mode can also be switched by a
12 V DC trigger type remote control. The remote
4020B
Active Loudspeaker
3
control wires can be connected to the first two
(starting from left) poles of the Phoenix connec-
tor (See Figure 2 for the connector pin sequence).
Remote control overrides the Autostart function.
Level control
The input sensitivity of the loudspeaker can be
matched to the output of the signal source by ad-
justing the level control on the rear panel.
Setting the tone controls
The frequency response of the Genelec 4020B
can be adjusted to match the acoustic environ-
ment by setting the tone control switches on the
rear panel. The controls are “Treble Tilt”, “Bass
Tilt” and “Bass Roll-Off”. An acoustic measuring
system such as WinMLS or comparable is recom-
mended for analyzing the effects of the adjust-
ments, however, careful listening with suitable
test recordings can also lead to good results if a
test system is not available. Table 1 shows some
examples of typical settings in various situations.
Figure 4 shows the effect of the controls on the
anechoic response.
Treble Tilt
The Treble Tilt control (switch 1) attenuates the
treble response of the loudspeaker at frequen-
cies above 5 kHz by 2 dB, which can be used for
smoothening down an excessively bright sounding
system.
ACOUSTIC
AXIS
146 mm
> 0,7 m
Figure 1: Location of the acoustic
axis
Figure 2: Audio and 12 V trigger
connector pin sequence
Figure 3: Control and connector layout on the rear panel
of an 4020B.
Loading...