Genelec Speaker 1092A User Manual

Operating  
Manual  
Genelec 1094A and 1092A  
Active Subwoofer Systems  
 
Subwoofer Positioning  
The figure to the left shows some example subwoofer positions  
within a room. Unless mentioned otherwise, the vents of the  
subwoofer should face towards the nearest wall.  
'Soffit' Mount  
5
1
2
3
2
1
Recommended position.  
2 & 3 Recommended only when using two subwoofers.  
4
5
This arrangement may cause a loss in low  
frequencies if the distance from the listening position  
to the front wall is between 1 and 3m.  
The 'Soffit' or flush mount is also recommended.  
Here the vents must radiate into the room.  
4
3
Figure2.Subwooferpositioning  
Safety Considerations  
Overload Indicators  
Positioning in the Room  
The 1094A/92A has been designed in  
accordance with international safety  
standards. However, to ensure safe  
operationandmaintaintheinstrument  
under safe operating conditions the  
followingwarningsandcautionsshould  
be observed.  
The 1094A contains a red 'Clip' LED.  
This indicator is located on the rear  
panel of the subwoofer.  
The clip LED will light if the amplifier  
isoverloaded.Ifthisoccursfrequently,  
reducetheinputleveltothesubwoofer  
until the clip LED stops blinking.  
Theplacementofthesubwooferinthe  
room will affect the overall frequency  
response of the system as, with low  
frequencies, the effects of the room  
are more apparent.  
The subwoofer radiation ports should  
be placed within 1m of a wall. The  
amplifierpanelshouldnotbepositioned  
lessthan10cmfromasurface, asthis  
may cause heat dissipation problems  
from the amplifier back plate. The  
placement will affect the phase  
differencebetweenthemainmonitors  
and the subwoofer, and also the bass  
roll-off rate. These effects can be  
compensatedbytheuseofthecontrols  
in the amplifier unit; but consideration  
should be made when placing the  
subwoofer.  
-
-
Servicing and adjustment should  
only be performed by qualified  
service personnel.  
Opening the amplifier's rear panel  
is strictly prohibited except by  
suchpersonswho areawareofthe  
hazards involved.  
-
It is forbidden to use this product  
with an unearthed mains cable,  
which may lead to personal injury.  
Warning!  
Choose a central and symmetrical  
position for the subwoofer as this will  
giveanevenphasematchbetweenall  
monitor channels. Positioning the  
subwooferclosetoacornershouldbe  
avoided as it will boost the bass level  
at lower frequencies and may cause  
asymmetrical spatial imaging.  
Thisequipmentiscapableofdelivering  
sound pressure levels in excess of  
85dB, which may cause permanent  
hearing damage.  
See the section titled 'Subwoofer  
Positioning' for examples of  
recommendedpositionswithinaroom.  
 
Coarse Phase Correction  
Method  
Setting the Phase Control  
The method to coarse align the phase  
of the system is as follows.  
Theeffectofincorrectphasealignment  
betweenmainmonitorsandsubwoofer  
is a drop in the frequency response of  
the whole system at the crossover  
frequency. The graphs below (figure  
3) show the effect of phase difference  
on the frequency response.  
Connect a high grade measuring  
microphone to the analyser and feed  
pink noise into the left main monitor.  
Positionthemicrophoneatthelistening  
positionandadjusttheinputsensitivity  
of the subwoofer until frequencies  
belowandabove85Hzare reproduced  
withequallevel.Thenadjustthephase  
control switches until a clear dip of at  
least-6dBcanbeseenatthecrossover  
frequency (85 Hz).  
Connect an audio frequency signal  
generator to one of the channels used  
in the system. If the signal generator  
hasanunbalancedoutputuseacable  
withpin3groundedtopin1attheinput  
as shown in figure 4 below.  
The phase difference between the  
main monitors and subwoofer at the  
listening position is dependent upon  
the position of the subwoofer in the  
listening room. For accurate system  
alignment in the room acoustic  
measuring equipment is required. If  
this equipment is not available to the  
user coarse phase matching can be  
applied.  
If a dip appears at several switch  
positions select the one that gives the  
deepest reading. This should be the  
case where the phase difference  
between the subwoofer and the main  
monitors is at a maximum. To change  
thephasedifferencetoaminimumthe  
-180° switch should be moved to the  
opposite setting. The frequency  
analyser should now show the  
smoothest response around 85 Hz  
and the phase should now be set  
correctly.Repeattheaboveprocedure  
with the right channel and possible  
centre channel main monitors.  
2
1
CABLE  
3
RCA  
XLR  
MALE  
SCREEN  
Figure 4. XLR to RCA connector for  
unbalanced operation.  
Phase D ifference: 0°  
Setthefrequencygeneratorto85Hz.  
If a signal generator is not available  
then it is possible to use an audio test  
recording with a test frequency in the  
range 70Hz to 100Hz.  
85 Hz  
Subwoofer Bypass Control  
Toggle the -180° phase  
switch 'on' and 'off' and set it  
to the position which gives  
the lowest sound level at the  
listening position.  
A bypass control feature is included  
into the subwoofer circuits so that the  
effect of the subwoofer on the whole  
monitor system can be determined.  
With the bypass switch on, the high  
pass filters for the main monitors are  
bypassed and the system behaves as  
if the subwoofer were not connected.  
The bypass remote controller is  
inserted into the ¼ inch jack socket  
located on the rear amplifier panel.  
See figure 5 for construction details.  
Phase D ifference: 90°  
85 Hz  
Next toggle the -90° phase  
switch'on'and'off',andagain  
set it to the position which  
gives the lowest sound level.  
Phase D ifference: 18 0°  
Finally, set the -180° phase  
85 Hz  
switchtotheoppositesetting.  
Mono ¼inch  
Jack Socket  
Phase D ifference: 27 0°  
Phase Correction Method  
with Test Equipment  
SPST Switch  
If a frequency analyser and a pink  
noisegeneratorareavailablethenthe  
following procedure can be used to  
match the phasing between the  
subwoofer and the main monitors.  
85 Hz  
Figure 3. The effect of phase difference  
between the subwoofer and the main  
monitors  
Figure 5. Bypass Remote Switch  
Construction.  
 
SystemConnection  
beofthebalancedXLRtypetominimise  
the noise immunity of the speaker  
system. If an unbalanced source has  
The following diagrams show the  
variouswaysthesubwoofercaneasily  
be included into an existing system.  
Allconnectionstothesubwoofershould  
to be used then an RCA to XLR  
connection is required; the electrical  
connection diagram is shown in fig. 4.  
Subwoofer in two channel  
Stereo mode.  
Both left and right stereo channels are  
fed into the inputs of the subwoofer.  
Each subwoofer output is then  
connected to the corresponding main  
monitor.  
Figure 6. One subwoofer in a two-  
channel system.  
Two Subwoofers (stereo) in  
two channel Stereo mode.  
To combine the two subwoofers into  
thesystemsothattheyproducestereo  
sub-bass signals, connect the system  
as shown to the left.  
Figure 7. Two subwoofers (stereo) in a  
two- channel system.  
Two Subwoofers (mono) in  
two channel Stereo mode.  
To combine the subwoofers into the  
system so that they produce mono  
sub-bass signals, connect the system  
as shown to the left.  
Note that the level generated by the  
subwoofers will be 6dB greater than  
that generated by a single subwoofer,  
hence reduce the sensitivity control of  
each subwoofer by 6dBu, so that the  
level balance is maintained between  
the subwoofer and the main monitors.  
Figure 8. Two subwoofers (mono) in a  
two-channelsystem  
 
Figure9.  
Subwooferinan  
AnalogueMatrix  
Surround Sound  
system  
Subwoofer in Analogue  
Matrix Surround Sound  
systems.  
If there is a subwoofer channel output  
on the decoder it should NOT be  
connected to the subwoofer speaker  
since the filtering within the decoder  
will effect the performance of the  
subwoofer.  
channels should be connected to the  
subwooferinputs(seefigure9above).  
Allfrontchannelsthatareusedshould  
be connected via the subwoofer so  
that the output of the subwoofer is  
matched to the rest of the system. All  
othersurroundsoundchannelsshould  
be connected as normal.  
When using a single subwoofer in an  
analogue matrix surround sound  
system, such as Dolby Surround or  
Dolby Pro-Logic, only the front three  
Figure10.  
Subwoofer in a  
digitalDiscrete  
5.1Surround  
Sound system  
Subwoofer in Digital  
Discrete 5.1 Surround  
Sound systems  
Digital decoders do not limit the  
bandwidth of the rear channels. If  
necessary, a second Genelec 1092A  
or1094Asubwoofercanbeconnected  
to the rear channels.  
connected to the sub input on the  
1092Aor1094A(seefigure10above).  
Thisenablesthesubwoofertocorrectly  
reproduceallthesub-bassinformation  
in the mix. Genelec Subwoofers can  
be used to good effect in Discrete  
5.1system surround channels as  
they are wide band.  
Digital decoders, for example, Dolby  
Digital Surround (AC-3), DTS and  
DMAG2, have a discrete subwoofer  
channel output which should be  
 
Two Subwoofers (stereo) in  
three channel LCR mode.  
To combine the subwoofers into the  
system so that one subwoofer  
produces the left and centre bass  
signals, whilst the other produces the  
rightandcentrebasssignals, connect  
the system as shown to the left.  
Connection to the centre monitor can  
be made from either one of the  
subwoofer centre channels outputs.  
Notethatasabovethelevelsensitivity  
is 6dBu different from the single  
subwoofer system shown in figures 9  
and 10.  
Figure 11. Two subwoofers (stereo) in a three-channel system  
Two Subwoofers (mono) in  
three channel LCR mode.  
To combine the subwoofers into the  
system so that both subwoofers  
produce the bass signals for all three  
channels, connect the system as  
shown to the left.  
Note that the level generated by the  
subwoofer will be 6dB greater than  
that generated by a single subwoofer.  
Hence the sensitivity control of both  
subwoofersshouldbeturneddownby  
6dBu so that the level balance is  
maintained between the subwoofer  
and the main monitors.  
Connection to the centre monitor can  
be made from either one of the  
subwoofer centre channel outputs.  
Figure 12. Two subwoofers (mono) in a three-channel system  
Maintenance  
Guarantee  
Accessories  
No user serviceable parts are to be  
found within the amplifier unit. Any  
maintenanceoftheunitshouldonlybe  
undertaken by qualified service  
personnel. Ensure that if fuse  
replacement is required, only fuses of  
the appropriate voltage and current  
ratings are used. REMEMBER to  
disconnect the power supply by  
removing the mains cable before fuse  
replacement.  
This product is supplied with a ONE  
yearguaranteeagainstmanufacturing  
faults or defects that might alter the  
performanceofthe1094A/1092Aunit.  
Refer to supplier for full sales and  
guarantee terms. (Not applicable in  
the United States)  
Additional options available :  
Bypass switch box  
1092-400  
1092 Magnetic shielding 1092-403  
1094 Magnetic shielding 1094-403  
 
SYSTEM  
SPECIFICATIONS  
AMPLIFIER  
SECTION  
1094A  
1092A  
1094A  
1092A  
Freefieldfrequencyresponse  
of system (± 2.5 dB):  
Short term amplifier output  
power :  
29 - 80 Hz  
33 - 80 Hz  
400 W (8 Ohm) 180 W (4 Ohm)  
(Long term output power is limited  
by driver unit protection circuitry.)  
Maximum short term sine wave  
acoustic output in half space,  
averaged from 35 Hz to 85 Hz  
@ 1m:  
Amplifier system distortion  
at nominal output:  
THD  
>120 dB SPL >115 dB SPL  
< 0.08%  
< 0.08%  
< 0.08%  
< 0.08%  
< 0.08%  
< 0.08%  
< 0.08%  
< 0.08%  
SMPTE-IM  
CCIF-IM  
DIM100  
Selfgeneratednoiselevelinfree  
field @ 1m on axis (A-weighted)  
< 10 dB  
< 3%  
< 10 dB  
< 4%  
Harmonic distortion at 100 dB SPL  
@ 1m on axis in half space  
(30...100Hz):  
Signal to Noise ratio,  
referredtofulloutput:  
> 100 dB  
> 100 dB  
Mainsvoltage:  
100/200or115/230V  
± 10%  
Drivers:  
Weight:  
385 mm  
(15")  
2 x 210 mm  
(2 x 8")  
Voltageoperatingrange:  
50 kg  
30 kg  
Powerconsumption(average):  
(110 lb)  
(66 lb)  
Idle  
Full output  
60 VA  
650 VA  
50 VA  
300 VA  
Dimensions:  
Height  
Width  
Depth  
739 mm  
(291/16")  
615 mm  
(24 3/16")  
468 mm  
( 18 7/16")  
320 mm  
(12 5/8")  
INPUT  
SECTION  
Both Models  
620 mm  
(247/16")  
510 mm  
(201/16")  
Inputconnectors:XLRfemale.  
pin 1: gnd  
pin 2: +  
pin 3: -  
Inputimpedance:  
10 kOhm balanced  
CROSSOVER  
SECTION  
Both Models  
Input level for 100 dB SPL  
output @ 1m:  
variable from +6 to - 6 dBu  
Subsonicfilter(18dB/octave)  
below:  
29 Hz  
33 Hz  
OUTPUT  
SECTION  
Crossoverfrequency,(sub/mainmonitors)  
Crossoverfrequency,(subinputchannel)  
85 Hz  
Full band/85 Hz  
Both Models  
Crossoveracousticalslope  
Lowpass:  
Highpass:  
Output connectors: XLR male.  
pin 1: gnd  
pin 2: +  
pin 3: -  
28 dB/octave  
12dB/octave  
> 50 dB  
Midband rejection, freq. > 400 Hz:  
Outputimpedance:  
Gain:  
100Ohmbalanced,  
activefloating  
Bassroll-offcontroloperating  
range in 2 dB steps:  
from 0 to -6 dB @ 33 Hz  
0 dB  
Phase matching control in 90° steps: from 0° to -270° @ 85 Hz  
Genelec Oy, Olvitie 5  
FIN - 74100 IISALMI, FINLAND  
Phone: +358 - 17 - 813 311  
Telefax: +358 - 17 - 812 267  
Genelec Document DR920021  
(1092-0106-3)  
COPYRIGHT GENELEC OY 1998  
Web:  
E-mail: genelec@genelec.com  
All data subject to change without prior notice  
 

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