Crossover Filters - Genelec 1038B Datasheet

1038B Tri-amplified Monitoring System
System
The Genelec 1038B is a three-way active
monitoring system including loudspeaker
drivers, speaker enclosure, multiple power
amplifiers and low level active crossovers.
Designed for medium sized control rooms this
system is ideal for music recording studios,
film and video post-production and broadcast
main monitoring. Mastering suites are also
tailored for, where broad bandwidth, high
SPL 's and extended low frequency response
are essential. The 1038B is designed to per-
form well both as a free-standing monitor and
flush mounted into the control room wall.
The unique Directivity Control Wave-
guide™ (DCW™) Technology developed
by Genelec provides excellent stereo imag-
ing and frequency balance even in difficult
acoustic environments. The fast, low distor-
tion 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 orientation by simply
rotating the DCW unit.
Integrated construction
The system is very easy to use as only
mains power and a balanced input signal are
needed. 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 the enclosure with vibration
isolators, which also acts as quick release
hinges making maintenance operations easy
and straightforward. The speaker cabinet
is constructed of veneered MDF, which is
heavily braced to eliminate structural reso-
nances.
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 a
385 mm (15") bass driver 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
Applications
• Main monitors for medium sized
control rooms
• Music Recording Studios
• Broadcast Main Monitoring
• Video/Film Post production Studios
• TV Production Rooms
• Mastering Suites
reproduced by a proprietary 130 mm (5")
direct radiating cone driver loaded with the
DCW. The high frequency driver is a 25mm
(1") metal dome also loaded by the DCW. All
drivers are magnetically shielded as standard
to minimize stray magnetic field.
DCW technology
The revolutionary Directivity Control Wave-
guide Technology 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
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.