Genelec 1038-AC Owners manual

Genelec 1038AC

Operating

Monitoring Speaker

Manual

1. General description1. General description

1. General description

1. General description1. General description

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SystemSystem

System

SystemSystem

The Genelec 1038AC is a dedicated center
channel speaker for three channel (LCR) and
Surround systems. Its compact cabinet has
been designed for optimum placement in the
limited space above or below a video screen.
The Genelec 1038AC is totally compatible for
use with standard Genelec 1038A active
monitors, but it can also be used in all chan­nels of a Surround Sound or stereo system.
The 1038AC is a three-way active monitoring
system including drivers, multiple power
amplifiers and active crossovers. The ampli­fiers and crossovers are built into a separate
rack mount chassis.
The system is designed for film and video
post-production, DVD mastering and me­dium sized control rooms. It also suits project
studios, general purpose broadcasting, tele­vision studios and digital workstations . The
1038AC is recommended to be flush mounted
into the control room wall, but it can also be
used as a free-standing monitor.
The unique Directivity Control Waveguide
(DCW) Technology used provides excellent
stereo imaging and frequency balance even
in difficult acoustics environments. The fast,
low distortion amplifiers are capable of driv­ing the stereo system to peak output levels in
excess of 124 dB SPL at 2 m with program
signals. Versatile crossover controls allow for
precise matching of the speaker system to
different acoustic conditions.

DriversDrivers

Drivers

DriversDrivers

The bass frequencies are reproduced by
two 250 mm (10") bass drivers loaded with a
110 liter vented box. The -3dB point is 33 Hz
and the low frequency response extends
down to 29 Hz (-6 dB). The midrange fre­quencies are reproduced by a proprietary
130 mm (5") direct radiating cone driver
loaded with a DCW. The high frequency
driver is a 25 mm (1") metal dome also loaded
by a DCW.
The 1038AC is magnetically shielded in order
to minimise interference with video monitors.

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Figure 1. Suggested tone control settings for different acoustic environments

AmplifiersAmplifiers

Amplifiers

AmplifiersAmplifiers

The bass, midrange and treble amplifiers
produce 400W, 120W and 120W of short term
power respectively with very low THD and IM
distortion values. The system incorporates
special circuitry for driver overload protec­tion and amplifier thermal protection.

2. Installation2. Installation

2. Installation

2. Installation2. Installation

Each 1038AC monitor is supplied with a
separate amplifier unit in a 12 U 19" rack
mount chassis, a 10 meter connecting cable
set , a mains cable and an operating manual.
Once unpacked, place the loudspeaker in its
required listening position, taking note of the
line of the listening axis (see figure 3) and
install the amplifier into a standard 19" rack .
When flush-mounting the units it should be
noted that the cable connectors require 10
cm (4") of free space behind both the speaker
and the amplifier. It is also necessary to leave
5 cm (2" ) of space above and below the
amplifier to ensure adequate cooling.

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Before connecting up, ensure that the mains
switch is off (see figure 4). Check that the
mains voltage selector is correctly set and
that the appropriate fuse is fitted.
The connecting cables between the amplifier
and the speaker cabinet have Speakon 8­and 4-pole connectors. Push the connector
in and turn it clockwise until the retaining clip
clicks.
The audio input to the amplifier is made via a
10 kOhm balanced XLR connector, however,
unbalanced leads may be used as long as
pin 3 is grounded to pin 1 of the XLR (see
figure 2). Once the connections have been
made, the speakers are ready to be pow­ered-up.

Figure 2. XLR connection if unbalanced input is
required.

Crossover filtersCrossover filters

Crossover filters

Crossover filtersCrossover filters

The crossover frequencies of the active cross­over network are 410 Hz and 3.0 kHz in order
to obtain a uniform frequency balance under
different acoustic conditions. Special cali­brated controls are included in the cross­over; the Bass, Midrange and Treble level
controls operate in 1 dB steps. Furthermore,
the low frequency Tilt and Roll-off controls
both have four 2 dB steps to allow refined LF
response tailoring.
A high-pass filter is included in the LF channel
to protect the woofer from subsonic signals.
The crossover network is driven by an active
balanced input stage fed by a 3 pin XLR.
Variable input sensitivity allows for accurate
level matching to the mixing console.

Figure 3. Speaker cabinet dimensions and acoustic axis in horizontal and vertical mounting
positions.