Genelec SE7261A Owner's Manual

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SE7261A DSP Subwoofer Operating Manual
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Introduction
Congratulations and a thank-you for the purchase of this Genelec SE7261A DSP Subwoofer. This manual addresses setting up and using the Genelec SE7261A DSP Subwoofer with Genelec 8130A digital input loudspeakers in stand-alone mode without the GLM.SE™ software and the proprietary Genelec loudspeaker control network. Use with the GLM.SE™ network is described in the GLM.SE™ System Operating Manual.
EC Declaration Of Conformity
Safety: EN 60065: 2002 / IEC 60065:2001 7th Edition
EMC: EN 55013:2001 + A1:2003
EN 55020 :2002 + A1:2003
EN 61000 -3-2:2000 + A2:2005
EN 61000-3-3:1995 + A1:2001
The products herewith comply with the requirements of The Low
Voltage Directive 73/23/EEC, EMC Directive 2004/108/EC
Signed: Ilpo Martikainen Position: Chairman of the Board Date: 20-September-2007
Compliance to FCC Rules
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
• This device may not cause harmful interference, and
• This device must accept any interference received, including interference that may cause undesired operation.
with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Modifications not expressly approved by the manufacturer could void the user’s authority to operate the equipment under FCC rules.
System
Genelec SE7261A DSP Subwoofer is designed for precise monitoring of 24 bit/192 kHz AES/EBU digital audio signal. It is fully compatible with Genelec GLM.SE™ Loudspeaker Manager Software and the proprietary Genelec loudspeaker control network and Genelec 8130A digital input loudspeakers.
The SE7261A can perform bass management. The DSP bass management system splits the signal from each input into low and high frequency components. Signal content below the crossover frequency is reproduced by the subwoofer and signal content above the crossover frequency is reproduced by the loudspeakers connected to the outputs of the subwoofer.
Using the SE7261A in Stand-Alone Mode
When the subwoofer is not connected to the Genelec loudspeaker control network, it operates in stand-alone mode and only the functions actuated by the controls on the connector panel can be used. However, the settings made with the GLM.SE™ software can be saved into the subwoofer and applied even when the
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network is disconnected by setting CONTROL” on the subwoofer’s connector panel to position “STORED.”
This manual concentrates on using the subwoofer without the control network. All issues concerning the control network are explained in detail in the System Operating Manual provided with the GLM.SE™ Genelec Loudspeaker Manager kit.
switch “STORED/MANUAL
Installation
The SE7261A is supplied with a mains cable control network cable and place the subwoofer in a suitable location (for more details see the "Positioning" section).
Before connecting the audio signal cables, ensure that both the subwoofer and the main loudspeakers are switched off. Connections are easier to make if you roll the subwoofer on its side with the connector panel facing up. Use this position only for making the connections and roll the subwoofer back to its normal upright position before use.
this operating manual. Once unpacked,
, one 5 m GLM
Connections
Audio connections
Audio connections to the subwoofer are made by XLR connectors. All audio cabling from the source must always go first to the input connectors of the subwoofer and then on to the main loudspeakers from the subwoofer’s output connectors.
Connect the digital audio signal cables from your signal source to the four female XLR “AES/EBU INPUT” connectors. The inputs accept Single-Wire AES/EBU signal or S/P-DIF or AES3id signals with suitable impedance converters. The SE7261A cannot be used with analog audio input signal. If the chosen audio format includes an LFE (.1) channel, it must be connected to INPUT 4 and the “LFE IN USE” switch must be turned to “YES” position in order to utilize the versatile LFE channel controls integrated in the subwoofer. If there is no LFE channel to reproduce, INPUT 4 can be used for a normal full­bandwidth signal. In this case the “LFE IN USE” switch must be turned to “NO”
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Connect the signal cables for the main loudspeakers to the male “AES/EBU OUTPUT” connectors on the subwoofer. Each of these connectors carries a high-pass filtered version of the signal(s) received by the input connector marked with the same number. The default filtering frequency is 85 Hz. The filtering frequency cannot be changed with the controls available in the stand-alone mode. This feature is only available when the subwoofer is controlled by the GLM.SE™ software.
Network, mains, bypass and remote connectors
Two “CONTROL NETWORK” RJ-45 sockets are provided to connect the subwoofer to the proprietary Genelec loudspeaker control network. See the System Operating Manual for more information. The mains cable may only be connected to an earthed mains power supply. The “BYPASS” 1/4” Jack provides connection to the optional Genelec 1092-400 switch to operate the Bypass function. See “SE7261A Subwoofer Features” for description of this function.
The “REMOTE” RJ 11 connector can be used to connect the optional Remote Power/OVL LED (Genelec 7000-415) or 7000-416 Remote control switch for "Bypass" and "+10 dB LFE" functions.
If the frequency balance is not 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. If you are using two subwoofers, try placing them asymmetrically relative to the side walls. Sometimes moving the subwoofers apart into the front corners helps with problematic rear wall reflections and the loss of mutual coupling is compensated by the bass boost caused by corner positioning.
Although the SE7261A subwoofer is magnetically shielded, it may cause some picture distortion if placed near to very sensitive video monitors or computer displays. Move the subwoofer further away or try turning the driver side of the subwoofer away from the screen.
Positioning the subwoofer 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 subwoofer'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 subwoofer, and also the bass roll-off rate. These effects can be compensated by the use of the Tone and Phase controls on the subwoofer; but we recommend that at first you leave the controls untouched and concentrate on finding the position where the subwoofer gives the smoothest response, and only then use them to fine-tune the balance and phase alignment between the subwoofer and the main loudspeakers.
To begin, place the subwoofer at the front wall slightly offset from the center. The recommended 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
Minimum clearances to walls or other objects
The power amplifiers are attached to the lower part of the aluminium grille functioning as a heatsink. Do not cover the grille or place the subwoofer so that there is less than 10 centimeters (4") of free space in front of the grille. the subwoofer must either be ventilated or sufficiently large to dissipate heat so that the ambient temperature does not rise above 35 degrees Celsius (95°F).
Make sure that the space underneath the subwoofer is clear from obstructions. Thick carpets may block the ventilation clearance needed for cooling the electronics box. The reflex port side (opposite of the connector panel side) should always have a clearance of at least 7,5 centimeters (3") to any objects to ensure proper functioning of the reflex port.
The space adjacent to
Flush mounting the subwoofer
If the subwoofer is flush mounted into a wall or a cabinet, it is important to ensure unrestricted airflow from the reflex port and amplifier cooling. This can be done by making the recess 7,5 centimeters (3") wider than the subwoofer. Place the subwoofer
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into the right end of the recess with the driver side facing the room. This leaves sufficient 7,5 centimeters (3") of free space on the reflex port side. The height and depth of the recess should not be any bigger than those needed to fit the subwoofer flush with the wall surface.
SE7261A Subwoofer Features
Various controls and switches are accessible on the connector panel. Let us define and explain here their use and function (from left to right):
LFE Input 4 Controls
LFE in Use
When producing audio content in multichannel audio formats, the use of the LFE channel is directly linked to the media release format and the type of production. If in use, the LFE or (.1)
channel must be connected to AES/EBU INPUT 4 and the ‘LFE IN USE’ switch must be set to YES position. If no LFE signal is used, the ‘LFE IN USE’ switch should be set to NO position. The LFE input (AES/EBU INPUT 4) then operates in the same way as the other inputs.
AES/EBU Channel
An AES/EBU Single Wire signal normally carries two audio channels in what are called subframes A and B. The “AES/EBU CHANNEL” switch selects if the LFE signal is designated to subframe A or B.
LFE Bandwidth
The LFE input can be set to two frequency ranges: 19 to 85 Hz or 19 to 120 Hz using the “LFE BANDWIDTH” switch. Signal content in the LFE signal above the frequency value selected on the “LFE BANDWIDTH” switch is either not reproduced or is redirected (see below). See also “Typical applications of different LFE bandwidth settings” below.
Redirect
Setting the “REDIRECT” switch to the “ON” position activates the redirect function and it can only be activated if the “LFE BANDWIDTH” switch is set to “85”.
The redirected LFE signal is added to the audio signal contained in the other subframe of the AES/EBU audio cable connected to INPUT 4. Typically the LFE channel is paired with the Front Center channel, so one of the subframes of OUTPUT 4 carries the sum of the redirected LFE signal and the center channel signal. OUTPUT 4 should then be connected to the Front Center loudspeaker.
LFE +10 dB
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Subwoofer input 4 Subwoofer output 4
Subframe A Subframe B Subframe A Subframe B
Center signal LFE signal Center + redirected
LFE signal
LFE signal Center signal Center + redirected
LFE signal
The “LFE +10 dB” function of the subwoofer is designed to add the +10 dB of gain to the LFE channel in the production stage if it is not already done by the source connected to the monitoring system, Switching the “LFE +10 dB” switch to the “ON” position or using the optional remote control activates the function. A yellow light next to the “LFE +10 dB” switch illuminates when the “LFE +10 dB” function is activated and +10 dB of gain is added to the LFE signal. If the audio source outputs the LFE signal at the same level as the other (non-LFE) signals and the LFE should be reproduced at a 10 dB higher level, set this control to “ON”. If the LFE output is at a 10 dB higher level than other (non-LFE) channels, this switch should be set to “OFF”.
The “LFE +10 dB” function should not be used in the following cases:
• If the +10 dB LFE gain is already implemented by another device, for example, a DVD player, surround sound processor or the output matrix of a mixing console
• When producing an audio format that does not require the use of +10 dB gain on the LFE channel, such as DVD-Audio (MLP) and SACD (DSD).
Bypass
The “BYPASS” section allows the use of an optional Genelec 1092-400 remote bypass switch. This allows for remote control
of the subwoofer’s bass management bypass function. The red “BYPASS” light is illuminated when the bypass mode is active.
With the bypass mode on, the high pass filters for the loudspeakers are disabled and the system behaves as if the subwoofer was not connected. The bypass function has no effect on the LFE signal. If there is no LFE signal, the subwoofer will not reproduce any signal when the bypass is active.
Controls selection
The subwoofer works in stand-alone mode when the GLM.SE™ Control Network is not connected. The “CONTROLS SELECTION” switch allows selection between two basic methods to control a subwoofer in stand-alone mode.
“MANUAL CTRLS” refers to controlling the subwoofer using the controls on the subwoofer’s connector panel.
“STORED CTRLS” refers to using the settings stored inside the memory of the subwoofer. These settings can be set using the GLM.SE™ Loudspeaker Manager Software and the GLM. SE™ control network. The stored settings provide additional
Selection Switch setting
STORED
MANUAL CTRL
LFE In Use
Disabled Disabled Disabled Disabled Active Active Disabled Disabled Disabled Disabled
Active Active Active Active Active Active Active Active Active Active
LFE AES/EBU Channel
LFE Bandwidth
Redirect LFE
+10 dB
Bypass Mode Tone
Controls
Subwoofer Level
System Level
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functionality compared to the basic controls on the panel.
When the GLM.SE™ Control Network is connected, or when the “CONTROLS SELECTION” switch is in the “STORED CTRLS” position, some of the controls on the subwoofer’s electronics panel may be disabled. They are disabled because the subwoofer is being controlled through the GLM.SE™ Control Network, or by the settings stored inside the memory of the subwoofer. If a disabled control on the panel is adjusted, all the lights on the connector panel flash rapidly to inform that the control is disabled and that the change has no effect.
Roll-Off
The frequency response of the subwoofer may have to be adjusted to match the acoustic environment. The Bass Roll­Off adjustment reduces the level of the very low subwoofer frequencies. You can combine the -2 dB, -4 dB and -8 dB switches, providing an attenuation range from 0 to -14 dB – see table below for examples of combinations and the corresponding attenuation.
Roll-Off Sw 1 (-8 dB) Sw 2 (-4 dB) Sw 3 (-2 dB)
-0 dB
-2 dB
-4 dB
-6 dB
-8 dB
-10 dB
-12 dB
-14 dB
OFF OFF OFF
OFF OFF ON
OFF ON OFF
OFF ON ON
ON OFF OFF
ON OFF ON
ON ON OFF
ON ON ON
Test Tone:
The SE7261A subwoofer contains a tone generator for phase alignment. The “TEST TONE” switch activates the tone generator at the crossover frequency. The test tone signal is sent to OUTPUT 1 on AES/EBU subframe A. To perform an adjustment one main loudspeaker has to be connected to this channel and set to reproduce this signal with the subwoofer.
or -270 degrees of adjustment is provided at 85 Hz – see table below for switch combinations and the corresponding phase change. Incorrect phase alignment between the loudspeakers and the subwoofer causes a drop in the frequency response around the crossover frequency.
Acoustic measuring equipment such as Genelec AutoCal accurately align the phase. Alternatively, the following quick phase alignment process can be done:
• Disconnect all loudspeakers from the subwoofer outputs.
• Select the loudspeaker to be used as the reference for the phase alignment. Typically, this is the Front Center loudspeaker in a 5.1 multi-channel system.
Connect this loudspeaker to subwoofer’s AES/EBU OUTPUT 1
connector.
• Select subframe A for reproduction on the reference loudspeaker.
• The test tone is played simultaneously from the subwoofer and loudspeaker.
• Listen to the tone and adjust both “PHASE” control switches to find the setting that gives the minimum tone level at the listening position.
• After having found this minimum level setting, set the “-180 DEG” switch to the opposite setting to complete the setup. This puts the subwoofer in phase with the reference loudspeaker and completes the phase calibration.
• Finally, reconnect all loudspeakers to the subwoofer outputs.
Phase Sw 6 (-180 deg) Sw 7 (-90 deg)
-90°
-180°
-270°
OFF OFF
OFF ON
ON OFF
ON ON
Phase:
The phase relationship between a main loudspeaker and the subwoofer must be adjusted at the crossover point. A 0, -90, -180
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Subwoofer level
The level of the subwoofer relative to the loudspeakers can be adjusted with the “SUBWOOFER LEVEL” rotary control. This control allows matching the subwoofer level to the levels of the other loudspeakers.
System level
All digital audio inputs and outputs are referenced to 0 dBFS (digital Full Scale, the largest possible signal that can be represented by an AES/EBU signal). Genelec SE7261A subwoofer produces a sound pressure level of 100 dB (at one meter distance in free space) for a digital input signal of –15 dBFS.
If the digital source can control the digital level, it may be advantageous to lower the sensitivity either with the GLM.SE™ or the ”SYSTEM LEVEL” control of the subwoofer. This will enable the use of the upper end of the digital level controller.
The “SYSTEM LEVEL” switch group allows scaling the maximum sound level of the whole loudspeaker system. This control changes the subwoofer level as well as the levels of all loudspeakers connected to the subwoofer outputs.
It may be necessary to use the “SYSTEM LEVEL” attenuation switches to ensure that high-level digital audio signals do not overload the loudspeaker system. The suitable setting also depends on the listening distance. The correct setting for this control depends on the program source and the maximum sound level needed.
Connector panel warning light
The clip warning light (yellow) is activated by:
• level limiter circuit (soft clip) being activated
Typical applications of different LFE bandwidth settings
Using the 85 Hz LFE bandwidth setting with "Redirect" function is the most universal configuration for LFE monitoring. However, there are situations when the band-limited LFE settings serve a definite purpose.
Limiting the LFE bandwidth to 85 Hz without using the "Redirect" function can be used to simulate 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.
The 120 Hz LFE bandwidth setting complies with the replay systems of movie theaters and cinemas. 35 mm movie soundtracks use the LFE channel to reproduce a bandwidth 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 acoustical summing if the same signal is present in both channels. To avoid this, the LFE content should be kept completely different (de-correlated) from the low frequency content of the main channels when mixing music and sound effects for film release.
Maintenance
No user serviceable parts are to be found within the subwoofer enclosure. Any maintenance or repair of the loudspeaker should be undertaken by qualified service personnel only.
Safety considerations
The overload light (red) is activated by:
• thermal overload of the power amplifier or loudspeaker drivers (thermal protection has activated)
If a red warning light appears, turn the source level down. If the levels are already modest, ensure that there are no bit errors in the AES/EBU digital audio data.
1. Servicing and adjustment may only be performed by qualified service personnel. The subwoofer enclosure must not be opened.
2. Do not use this product with an unear thed mains cable or a mains connection without the protective earth contact as this may lead to personal injury.
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3.
To prevent fire or electric shock, do not expose the unit to water or moisture. Do not place any objects filled with liquid, such as vases on the subwoofer or near it.
4. Note that the amplifier is not completely disconnected from the AC mains service unless the mains power cord is removed from the subwoofer or the mains outlet.
5. Free flow of air around the subwoofer is necessary to maintain sufficient cooling. Do not obstruct airflow around the subwoofer.
WARNING!
Guarantee
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The free field frequency response of the SE72 61A subwoofer at different Bass Rol l-Off settings
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SYSTEM SPECIFICATIONS
SE7261A
Free field frequency response (± 3.0 dB)
Maximum short term sine wave SPL output averaged from 30 to 85 Hz, measured in half space at 1 meter
Maximum peak SPL output with random pink noise, measured in half space @ 1 meter
Self generated noise level in free field @ 1 m (A-weighted)
Harmonic distortion @ 1 m in half space @ 90 dB SPL 30 to 85 Hz
2nd 3rd
Driver, magnetically shielded: 250 mm (10”)
Weight: 27 kg (58 lbs)
Dimensions:
Height Width Depth
19 Hz - 100 Hz
108 dB SPL
113 dB SPL
15 dB
3 %2 %
527 mm (20 3/4”) 462 mm (18 3/16”) 363 mm (14 5/16”)
CROSSOVER SECTION
SE7261A
Subsonic filter (18 dB/octave) below
Crossover frequency, (sub/ main channels)
LFE cutoff Hz 85 Hz/120 Hz selectable
Bass Roll-Off control operating range in 2 dB steps @ 20 Hz
Phase matching control in 90° steps
Subwoofer Level control 0 to -18 dB
System Level control 0 to -35 dB in 5 dB steps
19 Hz
85 Hz default in stand-alone use
From 0 to –14 dB
From 0 to -270°
DSP SECTION
SE7261A
Digital audio input connectors 4 XLR female
Digital audio input impedance 110 Ohm
Digital audio output connectors
Digital audio output impedance
Digital audio format AES/EBU (AES3-2003)
Digital audio word length 16 bits, maximum 24 bits. Fixed point,
Digital audio sample rate 32 kHz, maximum 192 kHz. Supports
4 XLR male
110 Ohm
Can also be used with S/P-DIF and AES3id signals when impedance converters are used
AES/EBU format
Single-Wire AES signals.
AMPLIFIER SECTI ON
SE7261A
Short term amplifier output power (Long term output power is limited by driver unit protection circuitry)
Amplifier system distortion at nominal output
THD
Mains voltage 100, 120, 220 or 230 V according to region
Voltage operating range ±10 %
Power consumption
Idle Full output
120 W
0.05 %
15 VA 150 VA
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Designed to Adapt
Genelec Document D0082R002. Copyright Genelec Oy 12.2007. All data subject to change
750-SE7261A
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