Genelec 7050B User manual

Genelec 7050B
Active Subwoofer
Data Sheet
7050B

Main Features:
• LSE™ Power efficient port/
enclosure design
• Unparalleled low frequency
performance
• Precise integration to Genelec
8020A or 8030A systems
7050B Active Subwoofer
System
The Genelec 7050B active subwoofer is a
very compact low frequency loudspeaker,
designed to extend the bass reproduc-
tion of Genelec 8020A active loudspeak-
ers in stereo or surround applications
and models 8030A or 8130A in stereo
applications. Adding the 7050B to these
loudspeakers creates a compact near-
field monitoring system capable of a flat
frequency response from 25 Hz to 20 kHz
(± 3 dB). The 7050B should not be used
in surround applications with the 8030A or
8130A due to their greater SPL capacity.
Driver
The 7050B contains a single 205 mm (8”)
magnetically shielded low frequency driver,
housed in a Genelec Laminar Spiral Enclo-
sureTM (LSETM) bass reflex cabinet.
Crossover
The built-in crossover unit has five signal
input and output channels (L/C/R Front and
L/R Rear) and a LFE input, providing great
flexibility and easy connection. The discrete
LFE signal input is equipped with a selectable
85/120 Hz low-pass filter and a 0/+10 dB LFE
sensitivity switch.
The amplifier has adjustable sensitivity,
bass roll-off and phase matching controls
to tailor the response of the subwoofer to its
environment.
The crossover has a fixed 85 Hz low pass
filter for five main channels. However, the
signal passing through the “OUT” connectors
is full bandwidth, i.e. not filtered. Because of
this, the “BASS ROLL-OFF” switch (switch 2)
on the main loudspeakers must be switched on
to avoid unwanted overlapping of the frequency
bands between the subwoofer and main loud-
speakers. Due to this and the input sensitivity
of the 7050B subwoofer, it can only be used
with Genelec 8020A, 8030A, 8130A, 1029A,
2029A and 2029B active loudspeakers.
The overall input sensitivity of the sub-
woofer can be reduced from 0 dB to -18 dB
for easy level matching with the main loud-
speakers.
Amplifier
The amplifier produces 70 W of output power,
with very low THD and IM distortion. Driver
overload protection and power-on signal
muting is included in the amplifier circuitry.
The amplifier also incorporates thermal over-
load and short circuit protection.
LSETM cabinet construction
Like the larger Genelec 7000 series subwoof-
ers, the 7050B features the new Genelec
Laminar Spiral EnclosureTM (LSETM) bass
reflex cabinet. The cabinet is made of sheet
metal rolled into a spiral shape and clamped
between thick MDF side panels. The spiral
forms a seamless, gently curving reflex tube
with exellent laminar flow characteristics and
minimal turbulence noise. The curved shape
also offers excellent structural stiffness and
optimal packing of a very long reflex tube into
a small space.
The overall construction of the 7050B
is rugged and reliable: The amplifier unit is
mounted on vibration absorbers to ensure
rattle-free operation and the handsome cast-
aluminium grille protects the magnetically
shielded 8 inch driver.
Why a subwoofer?
For applications, such as computer mul-
timedia work and most types of near field
monitoring, the Genelec 8020A and 8030A
are appropriate monitor systems. However
if lower LF cutoff and more LF SPL are
required, the 7050B subwoofer has been
specifically designed to complement these
compact loudspeakers. When combined they
give a frequency response comparable to
some larger Genelec models - one of the dif-
ferences is the greater SPL’s offered by larger
systems.
The 8020A/8030A and 7050B combination
offers great flexibility in loudspeaker place-
ment. Due to the small physical size of the
main loudspeakers, they can be located on

desks and, if carefully placed appear fairly
innocuous in a room. Further advice on how
to place the loudspeaker is described in the
operating manual.
If the subwoofer and main loudspeakers
are placed properly some of the low fre-
quency problems associated with free stand-
ing speakers can be avoided.
Why active loudspeakers?
There are various reasons why active loud-
speakers are preferable to passive alterna-
tives, the most dominant being the integrated
construction allowing better optimization of
the system performance. The loudspeakers
are always delivered as a complete factory
calibrated system, consisting of all ampli-
fiers, crossover electronics and speaker
cabinets.
In an active loudspeaker system the ampli-
fiers are connected directly to the drive units.
Distortion anomalies and losses caused by
passive crossovers are completely avoided
resulting in better sound quality and maxi-
mum acoustic efficiency.
For every model of monitor the associ-
ated amplifiers have a unique design includ-
ing driver overload protection. The overload
protection detects signals that are above the
drivers safe limits preventing damage. This
makes the system immune to overloads
and spurious signals which synthesizers,
Figure 2: 7050B harmonic distortion analysis
in free field. In half space the SPL will be 6
dB higher.
sequencers and multimedia sources, such as
sound cards, can occasionally produce.
The crossover and phase responses
are optimized for each particular model to
achieve highly accurate system performance.
Consequently every model has the same
neutral sound.
Figure 1: The amplifier panel layout of a 7050B subwoofer.

7050B Data Sheet
Genelec Document BBA0061001. Copyright Genelec Oy 5.2007. All data subject to change without prior notice www.genelec.com
AMPLIFIER SECTION
INPUT SECTION
CROSSOVER SECTION
SYSTEM SPECIFICATIONS
7050B
Free field frequency response (± 3 dB) 25 Hz...85 Hz
LFE 85/120 Hz
Maximum short term sine wave SPL output
averaged from 30 to 85 Hz, measured in half
space at 1 meter
≥ 100 dB
Self generated noise level in half space at 1 m
on axis (A-weighted)
≤15 dB
Harmonic distortion at 90 dB SPL
at 1 m on axis in half space 30… 85 Hz
2nd
3rd
≤4%
≤1 %
Driver, magnetically shielded 205 mm (8")
Weight 18 kg (39.6 lb)
Dimensions
Height
Width
Depth
410 mm (161/8”)
350 mm (133/4”)
319 mm (129/16”)
OUTPUT SECTION
7050B
Subsonic filter (18 dB/octave) below 25 Hz
Input channels 5 main + LFE
Low pass frequency for 5 main channels 85 Hz
LFE cutoff frequency 85 or 120 Hz selectable
Midband rejection >400 Hz ≥50 dB
Bass Roll-Off control in 2 dB steps 0 to -6 dB @ 26 Hz
Phase matching control in 90° steps 0 to -270°
Input sensitivity control +12 to -6 dBu
LFE input sensitivity control 0 or +10 dB selectable
7050B
Amplifier short term output power
(Long term output power is limited by driver
unit protection circuitry)
70 W
Amplifier system THD at nominal output ≤0.08 %
Mains voltage 100, 120 or 230 V
Power consumption (average)
Idle
Full output
11 VA
120 VA
7050B
Input connectors XLR female
pin 1
pin 2
pin 3
gnd
+
-
Input impedance 10 kohm balanced
Input level for 100 dB SPL output @ 1 m Variable from +12 to -6
dBu
7050B
Input connectors XLR male
pin 1
pin 2
pin 3
gnd
+
-
Main loudspeaker Out gain 0 dB
Main loudspeaker Out connectors carry an unfiltered copy of the signal
arriving into their respective Input connectors.
International enquiries:
Genelec, Olvitie 5
FIN-74100, Iisalmi, Finland
Phone [phone]
Fax [phone]
Email [email protected]
In the U.S. please contact
Genelec, Inc., 7 Tech Circle
Natick, MA 01760
Phone [phone]
Fax [phone]
Email [email protected]
In China please contact:
Beijing Genelec Audio Co. Ltd.
Jianwai SOHO, Tower 12, Room 2306
39 East 3rd Ring Road
Chaoyang District
Beijing 100022, China
Phone [phone], Fax [phone]
In Sweden please contact
Genelec Sverige
Ellipsvägen 10B
P.O. Box 5521, S-141 05 Huddinge
Phone [phone]
Fax [phone]
Email [email protected]