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Genelec 1237A and 1238A Operating Manual
Introduction
Congratulations and a thank-you for the pur-
chase of this Genelec Smart Active Monitor-
ing (SAM) Series DSP monitor loudspeaker.
This product should be set up using the
fully automatic process in the Genelec Loud-
speaker Manager GLM™ software. There
are no setup controls on the amplifier panel.
This manual describes the basic setup of
the monitor for use with the GLM software,
as well as use in the Stand-alone mode with-
out the GLM software in use or permanently
connected for computer control.
Each monitor is supplied with a mains
cable, one GLM control network cable, and
an operating manual.
System
The Genelec 1237A and 1238A are three-way
monitoring systems for medium sized control
rooms. They perform well as free-standing
monitors as well as flush-mounted in control
room walls. They are suited for recording,
film and video post-production, broadcast
monitoring as well as for mastering.
The unique Directivity Control Wave-
guide™ (DCW™) technology by Genelec
provides excellent stereo imaging and neutral
frequency response even in difficult acous-
tics.
With program material at a 2 meter listen-
ing distance, the fast low distortion ampli-
fiers drive a stereo system to peak sound
levels in excess of 122 dB SPL (1237A) or
124 dB SPL (1238A).
The 1237A and 1238A are fully compatible
with Genelec Loudspeaker Manager GLM™
and proprietary Genelec control network.
They can be used with 8200-series SAM
monitors and 7200-series SAM subwoofers
in the same network.
Drivers and Cabinet
Construction
The 1238A reproduces low frequencies with
a 385 mm (15 in) woofer in a 110 litre bass
reflex enclosure. The 1237A features a 305
mm (12 in) woofer in a 65 litre bass reflex
enclosure. Both monitors use the same pro-
prietary 130 mm (5 in) direct radiating mid-
range driver, and a 25 mm (1 in) metal dome
tweeter, both acoustically loaded by the pro-
prietary Directivity Control Waveguide. All
drivers are magnetically shielded.
Amplifiers and Signal
Processing
The 1237A and 1238A use the RAM-L ampli-
fier unit. The RAM-L is mounted with vibra-
tion absorbers in the rear of the monitor
enclosure, and can also be detached and
mounted to a 19 inch rack. Digital signal pro-
cessing in the RAM-L amplifier unit is done
with high precision algorithms, and includes
driver and amplifier overload protection.
The room response compensations include
highly flexible parametric filters, level align-
ment, and acoustic delay compensation.
These allow accurate matching to all console
output sections and room acoustics.
Mounting Considerations
Place monitors so that their acoustic axes
are aimed towards the listening position
(see Figures 1 and 2). Place monitors with
left-right symmetry and at an equal distance
from the listening position. Acoustic reflec-
tions from objects close to monitors and the
listening position can cause colouration and
blurring of the sound image. Symmetrical
positioning of reflective objects maintains
good stereo imaging. When soffit (flush)
mounting, the wall surface should extend to
the monitor, forming a continuous surface.
Minimum Clearances
The minimum clearance is 5 cm (2 in) behind,
above and on both sides of the monitor,
when the RAM-L amplifier is mounted on the
enclosure. The ambient temperature around
the amplifier must not exceed 35 degrees
Celsius (95°F). When soffit mounting, suf-
ficient ventilation should be a arranged
behind the monitor. This may require forced
ventilation around the RAM-L amplifier.
When the RAM-L amplifier is mounted
in a 19 in rack, the minimum free space
is 1U both above and below the amplifier
and both sides of the amplifier fully open
to enable free movement of air. Use the
included rack mount front plate to ensure
sufficient space above and below the
amplifier.
When the RAM-L is mounted on a table,
shelf or similar solid surface, there must be a
free space of at least 250 mm (10 in) above
and 10 cm (4 in) on both sides of the ampli-
fier. Free air flow must be possible in the
front side of the amplifier.
Set-up and Use
Monitor calibration and setup
The 1237A and 1238A are set up using the
GLM software. The setup is fast and con-
sists of the following steps:
1.
Run a CAT5 (RJ45) cable from the mon-
itor control network to the next monitor.
2.
Run the final cable to control network
input of the GLM Adapter device.
3.
Connect the GLM Adapter device to
your computer USB connector. The
cable is a part of the GLM User Kit.
4.
Place the Genelec measurement micro-
phone at the listening location of the
engineer, on a stand, with the micro-
phone pointing upwards and the micro-
phone top at the height of the engineers
ear in normal working position. The
microphone is a part of the GLM User
Kit.
5.
Run the microphone cable to the micro-
phone input in the GLM Adapter device.
6.
Download GLM software at the Genelec
web site (www.genelec.com). Install the
GLM software.
7.
Follow the GLM software instructions
to measure and set up your monitors.
8.
If you plan to not use a computer for
controlling the monitors, use the GLM
software to write the setting into the
monitors ("Store the Settings").
Recommendations for
AES/EBU Audio
For a digital input signal of –30 dB FS, the
1237A and 1238A monitors will produce a
100 dB sound level (SPL) at 1 meter distance,
in free space. The sensitivity of the monitor
system is set using the GLM software.
It is advantageous to keep the maximum
incoming digital audio signal level high,
near to 0 dBFS. It may be useful to lower
the internal GLM level control. This enables
maintaining high digital resolution in the digi-
tal source.
Single-wire mode of AES/EBU is the
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