Genelec LSE 7071A, LSE 7070A, LSE 7060A User Manual

LSE Series
Operating Manual Genelec 7060A, 7070A and 7071A
Active Subwoofers
7060A, 7070A and 7071A Active Subwoofers
General description
Bass management unit
The built-in bass management unit has six signal input and output channels (L/C/R Front and L/C/R Rear), a discrete LFE signal input and a summed signal output, providing great fl exibility and easy connection in all monitor­ing environments.
The active crossover contained in the bass management unit splits the input signals into low and high frequency components at 85 Hz. Frequencies below 85 Hz are directed to the subwoofer and frequencies above 85 Hz to the main speakers.
The low pass section sensitivity can be adjusted from +12 dBu to -6 dBu to allow
easy subwoofer level matching with various main speakers. All outputs have 0 dB pass­band gain.
The low pass frequency of the LFE input channel can be set to 85 Hz, 120 Hz or 85 Hz with "Redirect" function that routes LFE con-
tent above 85 Hz to the front center monitor. The input sensitivity of the LFE channel can be set to 0 dB or +10 dB.
Balanced XLR connectors are used for the system audio inputs and outputs.
Two "Bass Roll-Off" switches are included to provide a fl at bass response in all acous- tical environments, enabling adjustments of the subwoofer response in three -2 dB steps. Two phase matching switches in the crosso­ver allow compensation for the delay which occurs if the subwoofer is placed away from the main speakers, or for other speaker sys­tems phase behaviour. Four settings are pro­vided between 0° and -270°. An 85 Hz test tone generator is included to help achieve accurate crossover phase alignment.
Installation
Each subwoofer is supplied with a mains cable and an operating manual. Once unpacked, place the subwoofer in a suitable location (f or 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 voltage selector switch is set according to your local mains voltage (subwoofers sold in Europe have a fi xed 230V setting). Connections are easier to make if you roll the subwoofer on its side with the amplifi er panel facing up. Use this position only for making the connections and roll the subwoofer back to its normal upright position before use. Audio connec­tions to the subwoofer are made via balanced XLR connectors. An unbalanced source can also be used with a special RCA to XLR cable; the correct connection for the cable is shown in Fig. 2. Howev er , we recommend the use of balanced cables and connectors due to their better noise immunity . The connectors are arranged in three rows on the amplifi er panel (see Fig. 1):
Top row
LFE IN / SUM IN: Use this connector for the LFE or .1 output channel of a 5.1- or
6.1-channel discrete surround sound source, or the SUM OUT signal from the "master" subwoofer in a daisy-chained multiple sub­woofer confi guration. Note that the "sub- woofer out" channel of an analogue matrix surround decoder (Dolby Surround, Dolby
Figure 2. XLR to RCA connector for unbalanced operation.
Figure 1. 7070A's amplifier panel, connectors and controls.
Pro Logic) should not be connected to the "LFE IN" input. See section "Subwoofer in analogue matrix sound systems".
SUM OUT: Use this output connector when you want to link another subwoofer to your system. "SUM OUT" carries an unfi ltered sum of signals combined from all input chan­nels. See section "Using multiple subwoof­ers".
Middle row
FRONT L, C, R CHANNELS IN/OUT: Use these connectors for the Front Left, Center and Right channels of a surround sound system or the Left and Right channels of a Stereo system. Connect line level signal cables from your signal source to their respec­tive "LEFT IN", "CENTER IN" and "RIGHT IN" connectors. Then connect the subwoofer to your main monitors with XLR cables from the "LEFT OUT", "CENTER OUT" and "RIGHT OUT" connectors. All "L, C and R OUT" chan­nels are high pass fi ltered with the fi ltering frquency fi xed at 85 Hz (12 dB/octave).
Bottom row
REAR L, C, R CHANNELS IN/OUT: Use these connectors for the Rear Left, Center and Right channels of a surround sound system. The connection is made in the same
way as with the Front channels. Also these channels are high pass fi ltered at 85 Hz.
subwoofer and main monitors are ready to be powered up.
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 fi nd the optimum placement.
difference between the main monitors and the subwoofer , and also the bass roll-off rate . These effects can be compensated by the use of the controls in the amplifi er unit; but we recommend that at fi rst you leave the switches untouched and concentrate on nding the position where the subwoofer gives the smoothest response, and only then use the controls to fi ne-tune the balance and phase alignment between the subwoofer and the main monitors.
Once all connections have been made, the
Positioning in the room
The placement will affect the phase
To begin with, place the subwoofer slightly
Figure 3. Recommended distances to the front wall
offset from the center of the front wall. The recommended distance to the wall is less than 60 cm / 24" measured from the subwoofer's driver (See Fig. 3). This position gives increased acoustic loading (and SPL) due to the proximity of the front wall and fl oor . Cancellations from the front wall and fl oor are also avoided. Front wall cancellation for the 85 Hz high pass fi ltered main speakers can be eliminated by placing them at least 110 cm / 43" away from the front wall. In a multichannel system the main monitors should ideally be positioned symmetrically and at an equal distance from the listening position.
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 refl ections and the loss of mutual coupling is compensated by the bass boost caused by corner positioning.
Phase Difference: 0°
Phase Difference: 90°
Table 1. Suggested Bass Roll-Off settings
85 Hz
Phase Difference: 180°
85 Hz
Figure 4. The effect of phase difference between the subwoofer and the main monitors
Although the 7060A, 7070A and 7071A subwoofers are magnetically shielded, they may cause some picture distortion if placed near 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.
Minimum clearances to walls
85 Hz
Phase Difference: 270°
85 Hz
er cooling. This can be done by making the recess 7,5 centimeters (3") wider than the subwoofer . Place the subwoof er into the right end of the recess with the driver side facing the room. This leaves suffi cient 7,5 centime- ters (3") of free space on the refl ex port side. The height and depth of the recess should not be any bigger than those needed to fi t the subwoofer fl ush with the wall surface.
or other objects
The power amplifi ers are attached to the lower part of the aluminium grille, which func­tions as a heatsink. Do not cov er the g rille or place the subwoofer so that there is less than 10 centimeters (4") of free space in front of the grille.
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 refl ex port side (opposite of the ampli- er panel side) should always have a clear­ance of at least 7,5 centimeters (3") to any objects to ensure proper functioning of the refl ex port.
Flush mounting the subwoofer
If the subwoofer is fl ush mounted into a wall or a cabinet, it is important to ensure unre­stricted airfl ow from the refl ex port and ampli-
Setting the input sensitivity
The subwoofer requires input sensitivity alignment to the source to obtain a correctly balanced system. The input sensitivity con­trol is located on the amplifi er panel of the subwoofer. An input voltage of -6 dBu with a
-6 dBu input sensitivity setting will produce 100 dB SPL @ 1m in free fi eld. To obtain a 110 dB SPL output an input voltage of +10 dBu is required when the input sensitivity is set to 0 dBu.
Setting the Bass Roll-Off
switches
The acoustic response of the subwoofer may have to be matched to the characteristics of the room and the positioning in which it will be used. To adjust the subwoofer to match these characteristics use the ''Bass Roll-Off' control switches located on the amplifi er
Figure 5. Flush mounting the subwoofer. Note the clearance needed on the reflex port side.
panel. Table 1 provides some suggestions for the "Bass Roll-Off" switch settings. When both roll-off switches are set to "OFF", a fl at anechoic response is obtained.
Setting the phase control
Incorrect phase alignment between main monitors and subwoofer causes a drop in the frequency response of the whole system at the crossover frequency. The graphs above (Fig. 4) show the eff ect of phase difference to the frequency response.
The phase difference between the main monitors and subwoofer at the listening posi­tion is dependent upon the position of the subwoofer, so the phase adjustment should be done only after the preferred position 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.
Coarse phase adjustment
method
Genelec 7060A, 7070A and 7071A subwoof­ers are equipped with a built-in 85 Hz fre­quency test tone generator for easy phase alignment. The test tone generator is con­nected to the subwoofer's "FRONT CENTER OUT" channel only. In a stereo system it is
Table 2. Recommended subwoofer/main monitor combinations.
consists of a LED in a compact case and a RJ11 cable to connect the case and the "REMOTE" RJ11 connector on the amplifi er panel.
Subwoofer bypass control
A bypass control feature is included in 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 fi lters for the main monitors are overridden and the system behaves as if the subwoofer was not connected. The bypass function has no effect on the LFE input. Two different bypass remote controllers are avail­able as optional equipment: 1092-400 switch that can be connected to a 1/4" jack connec­tor on the amplifi er panel and 7000-416 that connects to the "REMOTE" RJ11 connector. The 7000-416 option also includes remote control of the "LFE +10 dB" function and a link for the 7000-415 remote LED option.
necessary to temporarily connect either of the channels to this output.
Power up the system and set the DIP switches 3 (SUM IN MODE) and 4 (LFE +10 dB) on the fi rst switch group to "ON" Now you should hear an 85 Hz test signal from the subwoofer and the main monitor connected to the center channel output.
Toggle the -180° phase switch (DIP 4 on the second switch group) on and off, and set it to the position which gives the lowest sound level at the listening position.
Next toggle the -90° phase switch (DIP 3) on and off, and again set it to the position which gives the lowest sound level.
Finally , set the -180° phase switch (DIP 4) to the opposite setting and deactivate the test signal.
Phase correction method with
test equipment
The following procedure matches the phase between the subwoofer and the main moni­tors 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. The subwoofer's bass man­agement system will direct the frequencies above 85 Hz to the center main monitor while the subwoofer reproduces the frequencies below 85 Hz.
Position the microphone at the listening position and adjust the input sensitivity 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).
Change the -180° switch to the opposite setting. The phase should now be set correctly and the frequency analyser should show a smooth response around 85 Hz.
Overload indicators
The mode indicator LED on the amplifi er panel will turn from green to yellow to indi­cate clipping and then to red to indicate that the protection circuit has activated. If this occurs frequently, reduce the input level to the subwoofer until the LED remains green.
If the LED on the amplifi er panel is not easily visible, the optional Remote LED Kit can be used to bring it into view. The kit
Subwoofer in analogue matrix
surround sound systems.
When using Genelec 7060A, 7070A or 7171A subwoofers in a consumer analogue matrix surround sound system, such as Dolby Sur­round, Dolby Pro-Logic or Pro-Logic II or a professional matrix decoder such as a Dolby SDU-4, route the front channels through the subwoofer so that the output of the sub­woofer is matched to the rest of the system and select "Large" setting for the front speak­ers on the decoder. If there is a subwoofer channel output on the decoder it should NOT be connected to the subwoofer's "LFE IN" input since the processing within an ana­logue decoder will confl ict with the fi ltering in the subwoofer. Connecting the rear channels to the subwoofer is optional since the rear channels from most matrix decoders are band limited down to 100 Hz.
Monitoring the LFE channel
in digital discrete surround
sound systems
Some digital surround sound systems use a discrete Low Frequency Effects channel which should be connected to the "LFE IN" input on the amplifi er panel. This enables the subwoofer to correctly reproduce all the bass information in the mix.
The LFE channel on the 7060A, 7070A and 7071A can be set to two frequency ranges: 19 to 85 Hz or 19 to 120 Hz by using the "LFE BANDWIDTH" switch. If the LFE signal includes higher frequencies than 120 Hz, they can be monitored by using the "Redirect" function: Set "LFE BANDWIDTH" switch to "85" and the "REDIRECT" switch to "ON". Now the subwoofer reproduces LFE frequencies up to 85 Hz and reroutes all higher LFE content to the front center channel. This is the most fl exible setting for LFE signal management, as it ensures that all LFE content can be monitored in all situations and encoding formats. Note that the "Redirect" function is not enabled when the "LFE BANDWIDTH" switch is set to 120 Hz.
Typical applications of different
LFE bandwidth settings
As stated above, using the 85 Hz LFE band­width setting with "Redirect" function is the most universal confi guration for LFE moni- toring. However, there are situations when the band-limited LFE settings serve a defi nite 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 (de­correlated) from the low frequency content of the main channels when mixing music and sound effects for fi lm release.
Using the LFE +10 dB function
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 head­room of the LFE channel. Consumer and the­atrical decoders automatically add +10 dB of LFE gain to restore the level balance.
The "LFE +10 dB" function on the 7060A, 7070A and 7071A subwoofers 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's rst switch group to "ON" or by using the remote control. A yellow LED indicates that the function has been activated.
The "LFE +10 dB" function should not be used in following cases:
If the +10 dB LFE gain is already
implemented by another device.
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.
Using multiple subwoofers
Genelec 7060A, 7070A and 7071A subwoof­ers are equipped with a "SUM OUT" connec­tor to provide an easy way of coupling two or more subwoofers together in high SPL appli­cations. Table 2 shows the recommended confi gurations with different Genelec moni- tors. Connect an XLR cable from the "SUM OUT" connector of the "master" subwoofer to which the main monitor channels are con­nected, to the "LFE IN / SUM IN" connector of the other, "slave" subwoofer and turn the "SUM IN MODE" dip switch on the "slave" subwoofer to "ON".
When two subwoofers connected in this way are positioned close to one another , bass level increases by 6 dB. Three subwoofers give an SPL increase of 9,5 dB and four
subwoofers 12 dB compared to a single subwoofer. Adjust the sensitivity control of all subwoofers in the group to match the SPL level of the main monitor system.
Phase and Bass Roll-Off adjustments should be done individually for each subwoofer in the chain, especially if they are not placed close together. To check the phase alignment for the "master" subwoofer switch off the "slave" subw oofer and follow the instructions given in the previous sections.
To adjust the phase alignment of the "slave" subwoofer, you need to switch off the "master" subwoofer, connect a signal cable from the "slave" subwoofer's "FRONT CENTER OUT" connector to the center channel monitor and switch the "SUM IN MODE" switch to "OFF". This effectively changes the "slave" to "master" mode and the phase adjustment can be carried out. Return the connections and "SUM IN MODE" setting on the "slave" subwoofer back to the "SUM IN" mode after completing the adjustment.
Safety considerations
The LSE series subwoofers have been designed in accordance with international safety standards. However, to ensure safe operation and maintain the unit in safe oper­ating condition, the following warnings and cautions must be observed:
Do not expose the subwoofer to water
or moisture. Do not place any objects fi lled with liquid, such as vases on the subwoofer or near it.
Servicing and adjustment must only
be performed by qualifi ed
service personnel.
Opening the amplifi er panel is
strictly prohibited except by qualifi ed service personnel.
Always use a mains power connection
with protective earth. Failing to do
this may lead to personal injury.
Warning!
This equipment is capable of delivering sound pressure levels in excess of 85 dB, which may cause permanent hearing damage.
Maintenance
No user serviceable parts are inside the amplifi er unit. Any maintenance of the unit must only be performed by qualifi ed service personnel.
Guarantee
This product is supplied with a ONE year guarantee against manufacturing faults or defects that might affect the performance of the unit. Refer to supplier for full sales and guarantee terms.
Accessories
1092-400 1/4 jack "Bypass" switch 7000-415 RJ11 remote Power/Overload indicator LED 7000-416 RJ11 remote control for "Bypass" and "+10 dB LFE" functions
Figure 9. The free field frequency response of the 7060A subwoofer at different Bass Roll-Off settings
Figure 10. The free field frequency response of 7070A and 7071A subwoofers at different Bass Roll-Off settings.
Figure 6. 1092-400 "Bypass" switch
Figure 7. 7000-415 Remote Power/OVL LED
Figure 8. 7000-416 Remote control switch for "Bypass" and "+10 dB LFE" functions
Figure 11. The curves above show the harmonic distortion analysis of the 7060A in free field. In half space the SPL will be 6 dB higher.
Figure 12. The curves above show the harmonic distortion analysis of the 7070A and 7071A in free field. In half space the SPL will be 6 dB higher.
7060A, 7070A and 7071A Operating Manual
SYSTEM SPECIFICATIONS
7060A 7070A 7071A
Free fi eld frequency response 29 Hz85 Hz 19 Hz85 Hz 19 Hz85 Hz (+/- 3 dB) LFE 85/120 Hz LFE 85/120 Hz LFE 85/120 Hz
Maximum short term sine wave SPL output averaged from 30 to 85 Hz, measured in half space at 1 meter 108 dB SPL 112 dB SPL 118 dB SPL
Maximum peak SPL output with random pink noise, measured in half space at 1 meter 113 dB SPL 117 dB SPL 123 dB SPL
Self generated noise level in free fi eld @ 1 m on axis (A-weighted) 15 dB
Harmonic distortion @ 95 dB SPL @ 95 dB SPL @ 100 dB SPL at @ 1 m on axis in half space 30 85 Hz 30 85 Hz 30 85 Hz 2nd 2 % 2 % 2 % 3rd 2 % 2 % 2 %
Driver, magnetically shielded 250 mm (10) 305 mm (12) 2 x 305 mm (12”) Weight 26 kg (57 lbs) 50 kg (110 lbs) 81 kg (178 lbs) Dimensions
Height 527 mm (20 3/4) 625 mm (24 5/8) 755 mm (29 3/4”) Width 462 mm (18 3/16) 555 mm (21 7/8) 803 mm (31 5/8”) Depth 360 mm (14 3/16) 490 mm (19 5/16) 490 mm (19 5/16”)
CROSSOVER SECTION
7060A 7070A 7071A
Subsonic fi lter (18 dB/octave) below 29 Hz 19 Hz 19 Hz
Crossover frequency, (sub/main channels) 85 Hz
LFE cutoff Hz 85 Hz/120 Hz selectable Crossover slopes
Lowpass 36 dB/octave Highpass 12 dB/octave
Midband rejection >400 Hz 50 dB Bass Roll-Off control operating From 0 to –6 dB From 0 to –6 dB From 0 to –6 dB
range in 2 dB steps @ 30 Hz @ 20 Hz @ 20 Hz Phase matching control From 0 to 270
in 90° steps @ 85 Hz
AMPLIFIER SECTION
7060A 7070A 7071A
Short term amplifi er output power (Long term output power is limited by driver unit protection circuitry) 120 W 250 W 500 W
Amplifi er system distortion at nominal output THD 0.05%
Mains voltage 230 V, 115/230V or 100/200V according to region
Power consumption (average) Idle 15VA 15 VA 30 VA Full output 150 V A 250 VA 500 VA
INPUT SECTION
7060A 7070A 7071A Input connector XLR female
pin 1 gnd pin 2 + pin 3
Input impedance 10 kOhm balanced Input level for 100 dB SPL
output @ 1 m Variable from +12 to –6 dBu
OUTPUT SECTION
7060A 7070A 7071A Output connector XLR male
pin 1 gnd pin 2 + pin 3
Remote LED connector (RJ11) Remote LED for Power/Overload+Bypass Main monitor Out gain 0 dB Sum Out gain 0 dB
Genelec Document D0032R001. Copyright Genelec Oy 5.2002. All data subject to change without prior notice
7060A 7070A 7071A
Input sensitivity +12 to –6 dBu for 100dB @ 1 m Bypass Bypasses the bass management for the main channels LFE bandwidth 85 / 120 Hz LFE sensitivity 0 / +10 dB Redirect Redirects LFE channel signal above 85 Hz to center channel Sum in Changes subwoofer to Sum in mode Test tone for phase adjustment 85 Hz Bass Roll-Off 0/-2 dB/ -4 dB/ -6 dB 0/-2 dB/ -4 dB/ -6 dB 0/-2 dB/ -4 dB/ -6
@ 30 Hz @ 20 Hz dB @ 20 Hz Phase 0/90/180/270° @ 85 Hz
International enquiries: Genelec, Olvitie 5 FIN-74100, Iisalmi, Finland Phone +358 17 83 881 Fax +358 17 812 267 Email genelec@genelec.com
CONTROLS
In the U.S. please contact Genelec, Inc., 7 Tech Circle Natick, MA 01760 Phone +1 508 652 0900 Fax +1 508 652 0909 Email genelec.usa@genelec.com
www.genelec.com
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