Genelec 1092A User manual

OperatingOperating
OperatingOperating
Operating
ManualManual
ManualManual
Manual
Genelec 1094A and 1092AGenelec 1094A and 1092A
Genelec 1094A and 1092AGenelec 1094A and 1092A
Genelec 1094A and 1092A
ActiveSubwooferSystemsActiveSubwooferSystems
ActiveSubwooferSystemsActiveSubwooferSystems
ActiveSubwooferSystems

General Description
TheGenelec1094Aand1092Aactive
subwoofersarepowerfullowfrequency
loudspeakers, incorporating all the
amplifier and crossover electronics
needed to combine them with other
loudspeakers and amplifiers.
Drivers
The 1094A contains a single 385mm
(15") long throw cone driver, housed
in a 110 litre vented cabinet. A cavity
over the driver boosts the drivers
efficiencyandacousticallyattenuates
possible distortion components. The
1092A utilises two 210mm (8") cone
drivers, housed in a 55 litre vented
cabinet, and employs driver front
loading.
Crossovers
The 3+1 channel active crossover
within the amplifier unit filters the low
andhighfrequencycomponentsofthe
threefrontchannels,dividingtheinput
signals between the subwoofer and
the main monitors. A separate
subwoofer input connector allows for
complete compatibility with digital 5.1
channel surround sound systems.
The crossover filter also provides
calibrated ‘Bass Roll-off’ and ‘Phase’
controls, minimising the effects of the
room on the performance of the
subwoofer.
Amplifiers
The amplifier unit is mounted in the
rear of the cabinet on quick release
vibrationisolatorstoensurerattlefree
operation and long term reliability.
The1094Aand1092Aamplifieroutput
powers are 400W and 180W
respectively. The amplifiers
incorporate special driver protection
circuitryfordriveroverloadprotection.
Table 1. Suggested Bass Roll-Off switch settings.
Room Type Bass Roll-Off
Sw1 (-2dB) Sw2 (-4dB)
Flat Anechoic Response OFF OFF
Positioned near a wall ON OFF
Positioned in a corner ON ON
Installation
Each subwoofer is supplied with a
mainscableandanoperatingmanual.
Onceunpacked, placethe subwoofer
in a suitable position (for more details
see the 'Positioning' section).
Before connecting the audio signals,
ensure that both the subwoofer and
the main monitors are switched off.
Check that the subwoofer voltage
selector switch is set to the correct
voltage and that the correct fuse for
that voltage is fitted.
Audio connections to the subwoofer
are made via balanced XLR
connectors. Signals from the source
are fed into the subwoofer input
connectors and signals for the main
monitorsaretakenfromthesubwoofer
output connectors. Once all
connections have been made, the
subwoofer and main monitors are
ready to be powered up.
Setting the Input Sensitivity
The subwoofer requires input
sensitivity alignment to the mixing
console or other source to obtain a
correctly balanced system. The input
sensitivity control is located on the
rear panel of the subwoofer. An input
voltage of -6dBu with a -6dBu input
sensitivity setting will produce 100dB
SPL @ 1m. To obtain a 110dB SPL
output an input voltage of +10dBu is
required when the input sensitivity is
set to 0dBu.
Setting the Bass Roll-Off
Switches
The acoustic response of the
subwoofermayhavetobematchedto
the characteristics of room in which it
will be used. To adjust the subwoofer
to match these characteristics use
the ''Bass Roll-off' control switches
located on the rear panel of the
subwoofer. Table 1 provides some
suggestions for the 'Bass Roll-off'
switch settings. When both roll-off
switches are 'off', a flat anechoic
response results.
Genelec 1094A and 1092A Subwoofers
Figure1.FunctionalblocksofGenelec1094Aand1092ASubwoofers
H P 85 H z
Balanced
In p u ts
L
C
R
L
C
R
S e n s itiv ity
±6dB
Balanced
O utputs
0°
180°
Sta t/Stop
Mute
Pow e supply
cicuits
CRO SSO VER FILTER
D ive
P otection
Powe
A m p lifie
90°
270°
B ass
Roll-off
Phase
LP
85 H z
S
ub

Subwoofer Positioning
1 22
33 4
'Soffit' Mount
5The 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.
1 Recommended position.
2 & 3 Recommended only when using two subwoofers.
4 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.
5 The 'Soffit' or flush mount is also recommended.
Here the vents must radiate into the room.
Safety Considerations
The1094A/92Ahasbeendesignedin
accordance with international safety
standards. However, to ensure safe
operationandmaintaintheinstrument
under safe operating conditions the
followingwarningsandcautionsshould
be observed.
- 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!
Thisequipmentiscapableofdelivering
sound pressure levels in excess of
85dB, which may cause permanent
hearing damage.
Overload Indicators
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.
Positioning in the Room
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
andthesubwoofer,andalsothebass
roll-off rate. These effects can be
compensatedbytheuseofthecontrols
inthe amplifier unit; but consideration
should be made when placing the
subwoofer.
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.
See the section titled 'Subwoofer
Positioning' for examples of
recommendedpositionswithinaroom.
Figure2.Subwooferpositioning

Coarse Phase Correction
Method
Themethodtocoarsealignthephase
of the system is as follows.
•Connect an audio frequency signal
generatortooneofthechannelsused
in the system. If the signal generator
hasanunbalancedoutputuseacable
withpin3groundedtopin1attheinput
as shown in figure 4 below.
ON
1234
•Toggle the -180°phase
switch 'on' and 'off' and set it
to the position which gives
the lowest sound level at the
listening position.
ON
1234
•Finally, set the -180°phase
switchtotheoppositesetting.
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).
If a dip appears at several switch
positionsselect theonethat givesthe
deepest reading. This should be the
case where the phase difference
between the subwoofer and the main
monitorsis ata maximum. Tochange
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.
ON
1234
•Next toggle the -90°phase
switch'on'and'off',andagain
set it to the position which
gives the lowest sound level.
Phase Difference: 0°
Phase Difference: 90°
Phase Difference: 180°
Phase Difference: 270°
85 Hz
85 Hz
85 Hz
85 Hz
Setting the Phase Control
Theeffectofincorrectphasealignment
betweenmainmonitorsandsubwoofer
isa drop in thefrequency response of
the whole system at the crossover
frequency. The graphs below (figure
3)show theeffect of phasedifference
on the frequency response.
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.
Figure4.XLRtoRCAconnectorfor
unbalancedoperation.
21
3
SCREEN
CABLE
RCA
XLR
MALE
•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. Subwoofer Bypass Control
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
bypassedandthesystembehavesas
if the subwoofer were not connected.
The bypass remote controller is
inserted into the ¼inch jack socket
located on the rear amplifier panel.
See figure 5 for construction details.
SPST Switch
Mono ¼inch
Jack Socket
Figure5.BypassRemoteSwitch
Construction.
Phase Correction Method
with Test Equipment
If a frequency analyser and a pink
noisegeneratorareavailablethenthe
following procedure can be used to
match the phasing between the
subwoofer and the main monitors.
Figure3. Theeffect ofphase difference
betweenthesubwooferandthemain
monitors

SystemConnection
Subwoofer in two channel
Stereo mode.
Bothleftandrightstereochannelsare
fed into the inputs of the subwoofer.
Each subwoofer output is then
connected to the corresponding main
monitor.
The following diagrams show the
variouswaysthesubwoofercaneasily
be included into an existing system.
Allconnectionstothesubwoofershould
Two Subwoofers (stereo) in
two channel Stereo mode.
To combine the two subwoofers into
thesystemsothattheyproducestereo
sub-basssignals,connectthesystem
as shown to the left.
Two Subwoofers (mono) in
two channel Stereo mode.
To combine the subwoofers into the
system so that they produce mono
sub-basssignals,connectthesystem
as shown to the left.
Note that the level generated by the
subwoofers will be 6dB greater than
thatgeneratedbyasinglesubwoofer,
hencereducethesensitivitycontrolof
each subwoofer by 6dBu, so that the
level balance is maintained between
thesubwooferandthemainmonitors.
beofthebalancedXLRtypetominimise
the noise immunity of the speaker
system. If an unbalanced source has
to be used then an RCA to XLR
connection is required; the electrical
connectiondiagram is shownin fig. 4.
Figure 6. One subwoofer in a two-
channel system.
Figure 7. Two subwoofers (stereo) in a
two-channel system.
Figure 8. Two subwoofers (mono) in a
two-channelsystem

Subwoofer in Analogue
Matrix Surround Sound
systems.
When using a single subwoofer in an
analogue matrix surround sound
system, such as Dolby Surround or
Dolby Pro-Logic, only the front three
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.
Ifthere isa subwoofer channeloutput
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.
Subwoofer in Digital
Discrete 5.1 Surround
Sound systems
Digital decoders, for example, Dolby
Digital Surround (AC-3), DTS and
DMAG2, have a discrete subwoofer
channel output which should be
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 do not limit the
bandwidth of the rear channels. If
necessary, a second Genelec 1092A
or1094Asubwoofercanbeconnected
to the rear channels.
Figure9.
Subwooferinan
AnalogueMatrix
SurroundSound
system
Figure10.
Subwooferina
digitalDiscrete
5.1Surround
Soundsystem

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
thatgeneratedbyasinglesubwoofer.
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.
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.
Guarantee
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)
Accessories
Additional options available :
Bypass switch box 1092-400
1092 Magnetic shielding 1092-403
1094 Magnetic shielding 1094-403
Maintenance
No user serviceable parts are to be
found within the amplifier unit. Any
maintenanceoftheunitshouldonlybe
undertaken by qualified service
personnel. Ensure that if fuse
replacementisrequired,only fusesof
the appropriate voltage and current
ratings are used. REMEMBER to
disconnect the power supply by
removingthemainscablebeforefuse
replacement.
Figure11.Twosubwoofers(stereo)in a three-channel system
Figure12.Two subwoofers(mono)ina three-channelsystem

Freefieldfrequencyresponse
of system (± 2.5 dB): 29 - 80 Hz 33 - 80 Hz
Maximumshort termsine wave
acoustic output in half space,
averagedfrom35 Hzto85 Hz
@ 1m: >120 dB SPL >115 dB SPL
Selfgeneratednoiselevelinfree
field@ 1mon axis (A-weighted) < 10 dB < 10 dB
Harmonic distortion at 100 dB SPL
@ 1m on axis in half space
(30...100Hz): < 3% < 4%
Drivers: 385mm 2 x 210 mm
(15") (2 x 8")
Weight: 50 kg 30 kg
(110lb) (66 lb)
Dimensions: Height 739mm 615mm
(291/16") (243/16")
Width 468mm 320mm
( 18 7/16") (125/8")
Depth 620mm 510mm
(247/16") (201/16")
SYSTEMSYSTEM
SYSTEMSYSTEM
SYSTEM
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONSSPECIFICATIONS
SPECIFICATIONS 1094A1094A
1094A1094A
1094A 1092A1092A
1092A1092A
1092A
Subsonicfilter(18dB/octave)
below: 29 Hz 33 Hz
Crossoverfrequency,(sub/mainmonitors) 85 Hz
Crossoverfrequency,(subinputchannel) Fullband/85Hz
Crossoveracousticalslope
Lowpass: 28 dB/octave
Highpass: 12dB/octave
Midband rejection, freq. > 400 Hz: > 50 dB
Bassroll-offcontroloperating
range in 2 dB steps: from 0 to -6 dB @ 33 Hz
Phase matching control in 90°steps: from 0°to -270°@ 85 Hz
CROSSOVERCROSSOVER
CROSSOVERCROSSOVER
CROSSOVER
SECTIONSECTION
SECTIONSECTION
SECTION Both ModelsBoth Models
Both ModelsBoth Models
Both Models
Genelec Oy, Olvitie 5Genelec Oy, Olvitie 5
Genelec Oy, Olvitie 5Genelec Oy, Olvitie 5
Genelec Oy, Olvitie 5
FIN - 74100 IISALMI, FINLANDFIN - 74100 IISALMI, FINLAND
FIN - 74100 IISALMI, FINLANDFIN - 74100 IISALMI, FINLAND
FIN - 74100 IISALMI, FINLAND
Phone:Phone:
Phone:Phone:
Phone: +358 - 17 - 813 311+358 - 17 - 813 311
+358 - 17 - 813 311+358 - 17 - 813 311
+358 - 17 - 813 311
Telefax:Telefax:
Telefax:Telefax:
Telefax: +358 - 17 - 812 267+358 - 17 - 812 267
+358 - 17 - 812 267+358 - 17 - 812 267
+358 - 17 - 812 267
Web:Web:
Web:Web:
Web: www.genelec.comwww.genelec.com
www.genelec.comwww.genelec.com
www.genelec.com
E-mail:E-mail:
E-mail:E-mail:
E-mail: [email protected][email protected]
[email protected][email protected]
[email protected]
Shorttermamplifieroutput
power: 400 W (8 Ohm) 180 W (4 Ohm)
(Longterm output poweris limited
bydriver unitprotectioncircuitry.)
Amplifier system distortion
atnominal output: THD < 0.08% < 0.08%
SMPTE-IM < 0.08% < 0.08%
CCIF-IM < 0.08% < 0.08%
DIM100 < 0.08% < 0.08%
Signal to Noise ratio,
referredtofulloutput: > 100 dB > 100 dB
Mainsvoltage: 100/200or115/230V
Voltageoperatingrange: ± 10%
Powerconsumption(average):
Idle 60 VA 50 VA
Fulloutput 650 VA 300 VA
AMPLIFIERAMPLIFIER
AMPLIFIERAMPLIFIER
AMPLIFIER
SECTIONSECTION
SECTIONSECTION
SECTION 1094A1094A
1094A1094A
1094A 1092A1092A
1092A1092A
1092A
INPUTINPUT
INPUTINPUT
INPUT
SECTIONSECTION
SECTIONSECTION
SECTION Both ModelsBoth Models
Both ModelsBoth Models
Both Models
OUTPUTOUTPUT
OUTPUTOUTPUT
OUTPUT
SECTIONSECTION
SECTIONSECTION
SECTION Both ModelsBoth Models
Both ModelsBoth Models
Both Models
Inputconnectors:XLRfemale. pin 1: gnd
pin 2: +
pin 3: -
Inputimpedance: 10kOhmbalanced
Inputlevelfor100 dBSPL
output @ 1m: variablefrom +6to -6 dBu
Outputconnectors:XLRmale. pin 1: gnd
pin 2: +
pin 3: -
Outputimpedance: 100Ohmbalanced,
activefloating
Gain: 0 dB
Genelec Document DR920021Genelec Document DR920021
Genelec Document DR920021Genelec Document DR920021
Genelec Document DR920021
(1092-0106-3)(1092-0106-3)
(1092-0106-3)(1092-0106-3)
(1092-0106-3)
COPYRIGHT GENELEC OY 1998COPYRIGHT GENELEC OY 1998
COPYRIGHT GENELEC OY 1998COPYRIGHT GENELEC OY 1998
COPYRIGHT GENELEC OY 1998
All data subject to change without prior noticeAll data subject to change without prior notice
All data subject to change without prior noticeAll data subject to change without prior notice
All data subject to change without prior notice