Bass Management
Bass management divides the input audio
signal into low frequency and high frequency
content at the subwoofer crossover frequency.
The signal content below the crossover
frequency is reproduced by the subwoofer.
The signal content above the crossover
frequency is reproduced by the monitors.
In the distributed bass management
method used in the 7382A system, the
monitors and the subwoofer receive full
banwidth audio signal and the filtering is
done separately inside each monitor and
subwoofer. The lowpass and highpass
filters are set in synchrony by the GLM
management network. This method is only
available in systems where GLM computer
management is used and with monitors
supporting this method. The subwoofer
crossover frequency can be adjusted from
50 Hz to 100 Hz.
The distributed bass management
supports three different signal cabling
configurations:
• All channels are routed through the
subwoofer's IN/OUT connectors to the
respective monitors.
• Y-cables split each signal to the
subwoofer's IN connector and the
monitor's input.
• Signal sources with dual outputs for each
channel, one going to the subwoofer, the
other going to the monitor.
Use With GLM Control
Network
The 7382A SAM subwoofer is fully
compatible with Genelec Loudspeaker
Manager GLM software, the proprietary
Genelec monitor management network, and
all Genelec SAM monitors.
Managing the 7382A SAM subwoofer
using GLM software control unleashes
the full power of room compensation in
the 7382A SAM subwoofer, enabling 20
parametric room compensation filters. This
powerful room compensation functionality
is only available when the GLM is used.
Detailed information on the use with the
GLM network is presented in the GLM
System Operating Manual.
System Setup
The 7382A SAM subwoofer reaches its full
potential when set up and calibrated using
the GLM software. Genelec Loudspeaker
Manager GLM and the proprietary Genelec
monitor management network offer
• automated acoustic equalization
individually for every monitor and
subwoofer
• automated level alignment
• distance (acoustic time-of-flight)
calibration
• aligning of the subwoofers for bass
management
for any reproduction system from stereo
to complex 3D immersive setups, including
one or more subwoofers. GLM setup is fast
and accurate. It can precisely address the
typical narrow-band low frequency modal
resonances and radiation loads of a room
and offers precise frequency response
compensations. The settings can be
controlled with a computer or the settings
can be permanently stored in the monitors
and subwoofers, to make the setup available
at all times even when the computer is not in
use. Genelec recommends setting up SAM
monitoring systems using the GLM. You
can find a detailed description of the setup
process and the use of GLM in the GLM
System Operating Manual.
The setup using GLM is fast and consists of
the following steps:
• Connect a CAT5 (RJ45) cable between
each monitor (and subwoofer) and finally
to the control network input of the GLM
Adapter device (see Figure 1).
• Connect the GLM Adapter device to
computer USB connector.
• Using a microphone stand, place the
Genelec measurement microphone at the
listening location with the microphone
pointing upwards and the microphone
top at the height of the engineer’s ear.
The microphone is a part of the GLM
User Kit.
• Connect the GLM Adapter device to the
computer USB port using cable included
in the GLM User Kit.
• Download the GLM software at the
Genelec web site (www.genelec.com).
• Install the GLM software and follow the
instructions in the software to measure
and set up your system.
• If you plan to not use a computer for
controlling the subwoofer, use the GLM
software to write the setting into the
subwoofer (use menu item “Store | Store
the Current Group Settings…”).
With GLM software active and controlling
the 7382A SAM subwoofer, the use of analog
and digital inputs is controlled by the GLM
software entirely. In the software ‘Input Type’
in the ‘Group’ definition sets this. The GLM
software allows you to select and switch
between the analog and digital audio inputs.
If GLM control is not used, an AES/EBU
digital audio signal will override analog
signal. This means, if a valid digital audio
clock is detected, the digital audio is
selected over the analog audio.
When the GLM acoustic settings have
been stored in the 7382A SAM subwoofer
and are active, the input is selected by the
‘Group’ settings in the GLM software when
the settings are stored.
RAM-SW Power Switch Light
When used without a connection to the GLM
software, the light on the power switch on
the RAM-SW is green, indicating normal
operational mode. A red colour indicates
amplifier clipping and yellow indicates
thermal overload. If the red or yellow warning
light appears, turn down the level.
Additional Information
Positioning the Subwoofer in a Room
The location of the subwoofer can affect
the frequency response and sound level
dramatically particularly when the room
acoustic effects are strong. Even small
changes in a subwoofer's location can
make a marked difference in the frequency
response. To begin, place the subwoofer
near the front wall slightly offset from
the room center line. Often systematic
experimentation is needed to find the
location giving the flattest frequency
response at the listening location. Usually
the subwoofer is placed close to a wall as
this creates the highest output. Positioning
the subwoofer close to a corner will boost
the bass level at lower frequencies and may
also cause asymmetrical spatial imaging.
Measured from the subwoofer's driver the
recommended distance to a wall is less than
0.6 m (24 in). This avoids a loss of audio
level at low frequencies created by the audio
reflecting off the wall and cancelling certain
frequencies radiated by the subwoofer.
Operating Environment
This subwoofer is designed for indoor use
only. The permissible ambient temperature
is 15-35 degrees Celsius (50-95°F)
and relative humidity 20 – 80% (non-
condensing). When the product has been
stored or transported in a cool environment
and is taken into a warm room, wait about
