Genelec 1038BC User manual

Genelec 1038BC
Tri-amplified Monitoring System
Data Sheet
1038BC

1038BC Tri-amplified Monitoring System
Applications
• Multichannel Recording
• Video/Film Post Production Studios
• DVD Mastering Suites
• Broadcast Main Monitoring
• TV Production Rooms
The Genelec 1038BC is a dedicated center
channel for three channels (LCR) and mul-
tichannel surround systems. Its slim and
compact cabinet has been designed for opti-
mum placement in the limited space above or
below video monitors or screens.
Asitsnamesuggests,theGenelec1038BC
is best suited for use as a center channel
speaker with a pair of Genelec 1038B active
monitors. The 1038BC employs the same
midrange, treble drivers and Directivity Con-
trol Waveguide™ (DCW™) as a standard
1038B, as well as the same amplifier unit to
ensure complete tonal compatibility.
Genelec 1038BC is a three-way active
monitoring system including magnetically
shielded loudspeaker drivers, speaker enclo-
sure, multiple power amplifiers and low level
active crossovers. Designed for medium
sized control rooms this system is ideal
for video and film post-production studios,
multichannel music recording and broadcast
main monitoring. DVD mastering is also well
tailored for where broad bandwidth, high
SPL’s and extended low frequency response
are essential.
The separate amplifier unit is built into
a rack mount chassis for easy fitting into a
standard 19” equipment rack. A standard
10 meter connecting cable is provided to go
between the amplifier unit and the speaker
enclosure. It is recommended to flush mount
the 1038BC monitor into the control room
wall, but it can also be used as a free-stand-
ing monitor.
The unique Directivity Control Waveguide
Technology developed by Genelec provides
excellent stereo imaging and frequency bal-
ance even in difficult acoustic environments.
The fast, low distortion amplifiers are capable
of driving a 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. The
system can be used both in vertical and
horizontal orientations by simply rotating the
DCW unit.
Integrated construction
Uniform performance is obtained through the
integration of loudspeakers and amplifiers as
a complete matched and calibrated package.
The rugged amplifier unit is mounted into
a rack mount chassis with vibration isola-
tors which also act as quick release hinges
making maintenance operations easy and
straightforward. The speaker cabinet is con-
structed of veneered MDF which is heavily
braced to eliminate structural resonances.
Amplifiers
The bass, midrange and treble amplifiers
each produce 400W, 120W and 120W,
respectively of short term power with very
low THD and IM distortion. Special attention
has been paid to electronic design to ensure
the highest subjective sound quality currently
possible. To improve the acoustic transient
response the output impedance of the woofer
amplifier is made negative.The system incor-
porates special circuitry for drivers overload
protection.Thermal protection is included for
the amplifiers.
Drivers
The bass frequencies are reproduced by two
250 mm (10”) bass drivers loaded with a 110
liters 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 the
DCW. The high frequency driver is a 25 mm
(1”) metal dome also loaded by the DCW.
All drivers of the 1038BC are magnetically
shielded in order to minimize interference
with video monitors and stray magnetic field.
DCW technology
The revolutionary Directivity Control Wave-
guideTechnology is a means of improving the
performance of a direct radiating multi-way
loudspeaker in normal listening conditions.
The basic idea is to match the different drive
units precisely, both in terms of frequency
response and directivity. This will result
in a smoother and a virtually uncoloured
off-axis response of the system. Due to
improved control of the directivity, especially
System

Figure 2:The curves above show the effect of the‘bass’, ‘mid’and
‘treble’level controls, and the ‘bass tilt’and ‘bass roll-off’controls on the
free field response, measured at 2 m.
Figure 4: Block diagram
of the 1038BC
Figure 3:The location of the acoustical axis of the 1038BC in horizontal configuration
Figure 1:The curve group shows the horizontal directivity characteristics
of the 1038BC in its vertical configuration measured at 2 m.
in the midrange frequencies, more direct
sound and less early boundary reflections
are received at the listening position. This
results in more accurate stereo imaging and
makes the system less sensitive to differing
control room acoustics than any conventional
direct radiator design. The DCW Technology
improves drive unit sensitivity from +2 to +6
dB thus increasing the system maximum
sound pressure level.
Crossover filters
The crossover frequencies of the active
crossover network are 410 Hz and 3.0 kHz.
In order to obtain uniform frequency balance
under different acoustic conditions, special
calibrated controls are included in the cross-
over. 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 sen-
sitivity allows for accurate level matching to
the mixing console.
Options
Order code
Opt-09 Grille 1038-409BC

1038BC Data Sheet
AMPLIFIER SECTION
CROSSOVER SECTION
SYSTEM SPECIFICATIONS
1038BC
Lower cut-off frequency, -3 dB <33 Hz
Upper cut-off frequency, -3 dB >20 kHz
Free field frequency response 35 Hz - 20 kHz (±2.5 dB)
Maximum short term sine wave acoustic
output on axis in half space, averaged
from 100 Hz to 3 kHz @ 1 m >120 dB SPL
@ 0.5 m >126 dB SPL
Maximum long term RMS acoustic
output in same conditions with
IEC-weighted noise (limited by driver @ 1m >116 dB SPL
unit protection circuit) @ 0.5 m >122 dB SPL
Maximum peak acoustic output per pair
@ 2 m from the engineer with music
material > 124 dB
Self generated noise level in free field
@ 2 m on axis < 15 dBA
Harmonic distortion at 95 dB SPL Freq: 50...100 Hz <1%
@ 1 m on axis 100...20 kHz <0.5
Drivers Bass 2 x 250mm (10”)
Mid 130 mm (5”)
Treble 25 mm (1”) metal dome
All drivers are magnetically shielded
Weight 60 kg (130 lb)
Speaker dimensions Height 350 mm (13 3/4”)
(horizontal mounting) Width 950 mm (37 3/8”)
Depth 453 mm (17 7/8”)
Amplifier dimensions Height 530 mm (20 7/8”)
(horizontal mounting) Width 480 mm (18 7/8”)
Depth 113 mm (4 7/16”)
* Note that the cable connectors require additional
100 mm (4”) of space behind the speaker cabinet
and the amplifier.
1038BC
Bass amplifier output power with
an 4 Ohm load Short term 400 W
Mid amplifier output power with
an 8 Ohm load Short term 120 W
Treble amplifier output power with
an 8 Ohm load Short term 120 W
Long term output power is limited by driver unit
protection circuitry.
Slew rate 80 V/µs
Amplifier system distortion at THD <0.05%
nominal output SMPTE-IM <0.05%
CCIF-IM <0.05%
DIM 100 <0.05%
Signal to Noise ratio, Bass >100 dB
referred to full output Mid >100 dB
Treble >100 dB
Mains voltage: 100/200 or 115/230V
Voltage operating range at
230V setting 207 - 244 V (-10/+6 %)
115V setting 104 - 122 V (-10/+6 %)
Power consumption Idle 60 W
Full output 500 W
1038BC
Input connector: XLR female pin 1 gnd
pin 2 +
pin 3 -
Input impedance 10 kOhm balanced
Input level for 100 dB SPL output @ 1m variable from +6 to -6 dBu
Input level for maximum short term output
of 120 dB SPL @ 1m variable from +26 to +14 dBu
Subsonic filter below 33 Hz 18 dB/octave
Ultrasonic filter above 25 kHz 12 dB/octave
Crossover frequencies Bass/Mid 410 Hz
Mid/Treble 3 kHz
Crossover acoustical slopes 24 - 32 dB/octave
Level control operating range Bass from 0 to -6 dB & MUTE
in 1 dB steps Mid from 0 to -6 dB & MUTE
Treble from 0 to -6 dB & MUTE
Bass roll-off control in 2 dB steps from 0 to -8 dB @ 33 Hz
Bass tilt control in 2 dB steps from 0 to -8 dB @ 80 Hz
The ‘CAL’position is with all tone controls set to ‘off’
and input sensitivity control to maximum and
corresponds to a maximally flat free field response.
Genelec Document BBA0055001 Copyright Genelec Oy 2.2003.All data subject to change without prior notice
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