Genelec Speaker 7050B User Manual

Operating Manual  
7050B  
Genelec 7050B  
Active Subwoofer  
 
Figure 2. XLR to RCA connector for  
unbalanced operation.  
Figure 3. Recommended distances to  
the front wall  
Figure 1. 7050B's amplifier panel, connectors and controls.  
.1 output channel of a 5.1-channel discrete  
surround sound source.  
placing them at least 110 cm / 43" away from  
any objects to ensure proper functioning of  
the reflex port.  
the front wall (see Figure 2).  
Once all connections have been made, the  
subwoofer and main loudspeakers are ready  
to be powered up.  
If the frequency balance does not seem  
right, try moving the subwoofer slightly to  
the left or right so that different room modes  
are excited at different levels. Positioning  
the subwoofer close to a corner will boost  
the bass level at lower frequencies and may  
cause asymmetrical spatial imaging.  
Flush mounting the subwoofer  
If the subwoofer is flush mounted into a wall  
or a cabinet, it is important to ensure ampli-  
fier cooling and unrestricted airflow from the  
reflex port. This can be done by making the  
recess 7,5 centimeters (3") wider than the  
subwoofer. Place the subwoofer into the right  
end of the recess with the driver side facing  
the room. This leaves sufficient 7,5 centime-  
ters (3") of free space on the reflex port side.  
The height and depth of the recess should  
not be any bigger than is needed to fit the  
subwoofer flush with the wall surface.  
Positioning in the room  
The placement of the subwoofer in the room  
affects the overall frequency response and  
sound level of the system dramatically, as at  
low frequencies the effects of the room are  
strong. Even a slight change in the subwoof-  
er's location can make a marked difference in  
the frequency balance and often patient and  
methodical experimentation and testing is  
needed to find the optimum placement. The  
placement will affect the phase difference  
between the main loudspeakers and the sub-  
woofer and the bass roll-off rate.  
Although the 7050B is magnetically  
shielded, it may cause colour distortion if  
placed near to very sensitive video loudspeak-  
ers or computer displays. Move the subwoofer  
further away or try turning the driver side of  
the subwoofer away from the screen  
Minimum clearances to walls  
or other objects  
Do not cover the driver side of the subwoofer  
or place the subwoofer so that there is less  
than 10 cm (4") of free space in front of the  
grille.  
Sensitivity adjustment  
The subwoofer requires input sensitivity  
alignment to the source to obtain a correctly  
balanced system. The input sensitivity con-  
trol is located on the connector panel of the  
subwoofer. An input voltage of -6 dBu with a  
-6 dBu input sensitivity setting will produce  
100 dB SPL @ 1 m in free field.  
First place the subwoofer slightly offset  
from the center of the front wall. The rec-  
ommended distance to the wall is less than  
60 cm / 24" measured from the subwoofer's  
driver. This position gives increased acoustic  
loading (and SPL) due to the proximity of the  
front wall and floor. Cancellations from the  
front wall and floor are also avoided. Front  
wall cancellation for the 85 Hz high pass fil-  
tered main speakers can be eliminated by  
Make sure that the space underneath the  
subwoofer is clear from obstructions. Thick  
carpets may block the ventilation clearance  
needed for cooling the electronics.  
Setting the phase control  
Incorrect phase alignment between the  
The reflex port side (opposite of the con-  
nector panel side) should always have a  
clearance of at least 7,5 centimeters (3") to  
main loudspeakers and subwoofer causes  
 
Subwoofer placement  
Bass Roll-Off  
setting  
Near to a wall  
In a corner  
-2 dB  
-6 dB  
-2 dB  
Flush mounted  
Table 1. Suggested Bass Roll-Off settings  
Phase Difference: 0°  
Phase Difference: 90°  
85 Hz  
85 Hz  
Phase Difference: 180°  
Phase Difference: 270°  
85 Hz  
85 Hz  
Figure 5. Flush mounting the subwoofer.  
Note the clearance needed on the reflex  
port side.  
Figure 4. The effect of phase difference between the subwoofer and the main loudspeakers  
a drop in the frequency response of the  
whole system at the crossover frequency.  
The graphs above (Fig. 4) show the effect of  
phase difference to the frequency response.  
The phase difference between the main  
loudspeakers and subwoofer at the listen-  
ing position is dependent upon the position  
of the subwoofer, so the phase adjustment  
should be done only after the preferred posi-  
tion is found. Acoustic measuring equipment  
is required for accurate system alignment. If  
this equipment is not available, the following  
coarse phase matching can be applied.  
to the position which gives the lowest sound  
level at the listening position.  
Change the -180° switch to the opposite  
setting. The phase should now be set cor-  
rectly and the frequency analyser should  
show a smooth response around 85 Hz.  
Next toggle the -90° phase  
switch (DIP 4) "ON" and  
"OFF", and again set it to  
the position which gives  
the lowest sound level.  
Using the LFE Bandwidth and  
LFE +10 dB functions  
The “LFE BANDWIDTH” switch allows you to  
select the upper cutoff frequency of the LFE  
channel between 85 and 120 Hz. Limiting the  
LFE bandwidth to 85 Hz can be used to simu-  
late the effect of some consumer decoders  
that do not replay information above 80 Hz on  
the LFE channel when the bass management  
is used. Checking the multichannel mix with  
this setting on lets you know how it translates  
in systems with this limitation.  
Finally, set the -180° phase  
switch (DIP 5) to the oppo-  
site setting and deactivate  
the test signal.  
Coarse phase adjustment  
method  
Phase correction method with  
test equipment  
Connect an audio frequency signal generator  
to the “FRONT CENTER” input of the 7050B  
and set it to feed a 85 Hz signal to the system.  
Alternatively, you can use a 85 Hz signal fom  
a suitable audio test recording. Make sure  
you connect (even temporarily) a main loud-  
speaker to the "FRONT CENTER" output, so  
that the test signal is properly reproduced by  
both subwoofer and main loudspeaker.  
The following procedure matches the phase  
between the subwoofer and the main loud-  
speakers using a frequency analyser and a  
pink noise generator. Connect a high grade  
measuring microphone to the analyser and  
feed pink noise into the "CENTER IN" input of  
the subwoofer. Position the microphone at the  
listening position and adjust the input sensi-  
tivity of the subwoofer until frequencies below  
and above 85 Hz are reproduced at equal  
level. Then adjust the phase control switches  
for the maximum dip of at least -6 dB at the  
crossover frequency (85 Hz).  
The 120 Hz LFE bandwidth setting com-  
plies with the replay systems of movie theat-  
ers and cinemas. 35 mm movie soundtracks  
use the LFE channel to reproduce a band-  
width of 20 - 120 Hz through dedicated  
subwoofers. In this case the LFE and main  
channel bandwidths overlap between 85 and  
120 Hz, which may create unwanted acousti-  
cal summing if the same signal is present in  
both channels. To avoid this, the LFE content  
should be kept completely different (de-cor-  
related) from the low frequency content of  
Toggle the -180° phase  
switch (DIP 5 from left)  
"ON" and "OFF", and set it  
 
the main channels when mixing music and  
sound effects for film release.  
Do not obstruct airflow around the  
subwoofer.  
In Dolby Digital and DTS encoding formats  
the LFE channel has to be monitored with  
+10 dB gain in relation to the main channels.  
The object is to increase the recording head-  
room of the LFE channel. Consumer and the-  
atrical decoders automatically add +10 dB of  
LFE gain to restore the level balance.  
Note that the amplifier is not completely  
disconnected from the AC mains service  
unless the mains power cord is removed  
from the amplifier or the mains outlet.  
Warning!  
This subwoofer is capable of delivering sound  
pressure levels in excess of 85 dB, which  
may cause permanent hearing damage.  
The "LFE +10 dB" function on the 7050B  
subwoofer is designed to add the +10 dB  
gain to the LFE channel in the production  
stage, if it is not already done in the output  
matrix of the mixing console. The function is  
activated by switching the "LFE +10 dB" dip  
switch on the subwoofer to "ON". The "LFE  
+10 dB" function should not be used in fol-  
lowing cases:  
Maintenance  
No user serviceable parts are inside the  
subwoofer. Any maintenance of the unit must  
only be performed by qualified service per-  
sonnel.  
Figure 6. The free field frequency  
response of the 7050B subwoofer at  
different Bass Roll-Off settings  
Guarantee  
If the +10 dB LFE gain is already  
implemented by another device.  
This product is supplied with a ONE year  
guarantee against manufacturing faults or  
defects that might alter the performance of  
the unit. Refer to supplier for full sales and  
guarantee terms.  
When producing an audio format that  
does not require the use of +10 dB  
gain on the LFE channel, such as  
DVD-Audio (MLP), SACD (DSD) etc.  
When monitoring a decoded Dolby  
Digital or DTS soundtrack. The decoder  
will automatically provide +10 dB  
LFE gain.  
EC Declaration of Conformity  
This is to certify that Genelec 7050B Active  
Subwooferconformtothefollowingstandards:  
Safety considerations  
Safety:  
Genelec 7050B subwoofer has been  
designed in accordance with international  
safety standards. However, to ensure safe  
operation and maintain the unit in safe oper-  
ating condition, the following warnings and  
cautions must be observed:  
EN 60065 / IEC 60065:1998 6th Edition  
EMC:  
EN 55020 : 2002 + A1 : 2003  
EN 55020: (1994), A11: (1996), A12: (1999),  
A13: (1999), A14: (1999)  
EN 61000-3-2 (2000)  
Servicing and adjustment must only be  
performed by qualified service  
EN 61000-3-3 (1995)  
personnel. The subwoofer cabinet or  
electronics unit must not be opened.  
Do not use this subwoofer with an  
unearthed mains cable or an unearthed  
mains connection as this may  
The product herewith complies with the  
requirements of The Low Voltage Directive  
73/23/EEC, EMC Directive 89/336/EEC and  
93/68/EEC  
harmonic distortion analysis of the 7050B  
in free field. In half space the SPL will be  
6 dB higher.  
compromise electrical safety.  
Do not expose the subwoofer to water  
or moisture. Do not place any objects  
filled with liquid, such as vases on the  
subwoofer or near it.  
Signed:  
Ilpo Martikainen  
Position: Managing Director  
Date:  
3-May-2005  
This subwoofer is capable of producing  
sound pressure levels in excess of  
85 dB, which may cause permanent  
hearing damage.  
Free flow of air around the subwoofer is  
necessary to maintain sufficient cooling.  
 
7050B Operating Manual  
SYSTEM SPECIFICATIONS  
AMPLIFIER SECTION  
7050B  
7050B  
Free field frequency response (± 3 dB)  
25 Hz...85 Hz  
LFE 85/120 Hz  
Amplifier short term output power  
(Long term output power is limited by driver  
unit protection circuitry)  
70 W  
Maximum short term sine wave SPL output  
averaged from 30 to 85 Hz, measured in half  
space at 1 meter  
100 dB  
Amplifier system THD at nominal output  
Mains voltage  
≤ 0.08 %  
100, 120 or 230 V  
Self generated noise level in half space at 1 m ≤ 15 dB  
on axis (A-weighted)  
Power consumption (average)  
Idle  
Full output  
11 VA  
120 VA  
Harmonic distortion at 90 dB SPL  
at 1 m on axis in half space 30… 85 Hz  
2nd  
3rd  
≤ 4%  
≤ 1 %  
Driver, magnetically shielded  
Weight  
205 mm (8")  
18 kg (39.6 lb)  
Dimensions  
Height  
INPUT SECTION  
410 mm (161/8”)  
350 mm (133/4”)  
319 mm (129/16”)  
7050B  
Width  
Depth  
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  
CROSSOVER SECTION  
7050B  
Subsonic filter (18 dB/octave) below  
Input channels  
25 Hz  
5 main + LFE  
85 Hz  
OUTPUT SECTION  
7050B  
Low pass frequency for 5 main channels  
LFE cutoff frequency  
Input connectors XLR male  
85 or 120 Hz selectable  
≥ 50 dB  
pin 1  
pin 2  
pin 3  
gnd  
+
-
Midband rejection >400 Hz  
Bass Roll-Off control in 2 dB steps  
Phase matching control in 90° steps  
Input sensitivity control  
0 to -6 dB @ 26 Hz  
0 to -270°  
Main loudspeaker Out gain  
0 dB  
Main loudspeaker Out connectors carry an unfiltered copy of the signal  
arriving into their respective Input connectors.  
+12 to -6 dBu  
0 or +10 dB selectable  
LFE input sensitivity control  
Genelec Document D0061R001 Copyright Genelec Oy 5.2005. All data subject to change without prior notice  
In Sweden please contact  
Genelec Sverige  
International enquiries:  
Genelec, Olvitie 5  
In the U.S. please contact:  
Genelec, Inc., 7 Tech Circle  
Natick, MA 01760, USA  
Phone +1 508 652 0900  
Fax +1 508 652 0909  
In China please contact:  
Genelec China Representative Office  
Soho New Town, 88 Jianguo Road  
D-1504, Chaoyang District  
FIN-74100, Iisalmi, Finland  
Phone +358 17 83881  
Fax +358 17 812 267  
Ellipsvägen 10B  
P.O. Box 5521, S-141 05 Huddinge  
Phone +46 8 449 5220  
Fax +46 8 708 7071  
Beijing 100022, China  
Phone +86 10 8580 2180 Fax +86 10 8580 2181  
 

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