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
5.1” system 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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