SABINE FBX SOLO 620 SL-620 User manual

OPERATING
GUIDE
SL-620
SM-620 INSIDE THIS GUIDE:
About the FBX 2,3
Quick-Start Operation 2
FBX-SOLO Controls 4,5
Applications 6-8
Understanding Fixed
& Dynamic Filters 9
Operating Instructions 10-12
Troubleshooting Tips 13
Product Specifications 14
Cautions 14
Warranty 15
FBX and FBX Feedback Exterminator are registered trademarks of Sabine, Inc., and are the brand names of its line of automatic
feedback controllers. Covered by U.S. Patent No. 5,245,665, Australian Patent No. 653,736, Canadian Patent No. 2,066,624-2,
German Patent No. 69118486.0, and British Patent No. 0486679. Other patents pending. © 1996 Sabine Inc.
FBX-SOLO
Model SM-620
FBX-SOLO
Model SL-620
CONGRATULATIONS! You now have the state-of-the-art in feedback control. The Sabine
FBX-SOLO gives you automatic real-time feedback control for any channel on your mix. In
setup and during the performance, it gives you more gain and increases the clarity of your
mains and monitors. It's the affordable solution to feedback problems, perfect for wireless
mics, monitors, acoustic/electric instruments, harmonica mics, multi-mic locations like
conference rooms and courthouses -- wherever there's an open microphone.
The FBX-SOLO incorporates the latest in design and digital signal processing technology.
It automatically senses feedback in a sound system and determines its pitch. It then places
one of its six constant "Q" micro-filters on the resonating frequency and eliminates the
feedback in typically less than one second.
Special features of the SL-620 and SM-620:
• The SL-620 has 1/4" in/out connectors and input/output level switches for any
combination of ins and outs. The SL is for use with acoustic/electric guitars and guitar
amplifiers, mixer insert points, powered mixer patch points and high impedance mics.
• The SM-620, with selectable phantom power, has XLR in/out connectors for use with
balanced microphones.
• Both models offer standard FBX features like switchable filter widths and lockable
fixed filters.
See page 2 for quick-start operating procedures.

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WORLD'S BEST FEEDBACK CONTROLLER:
Before the invention of the FBX, the most common device for controlling feedback was the
31-band graphic EQ. However, the FBX has three distinct advantages. The most obvious
is the FBX functions automatically, even during the program. Another is the FBX micro-
filters are precisely placed while EQ filters are fixed. The difference: FBX filters do not have
to be as deep, so there is more system gain. The most important advantage is that FBX
micro-filters are ten times narrower than 31-band EQ filters. FBX micro-filters return up to
90 percent of the power removed by EQ filters.
Over the years, engineers stopped using 12-band EQs in favor of the narrower-filter 31-
band EQ for controlling feedback. The FBX represents the next step. An EQ would need
more than 10,000 sliders to be equivalent to your FBX. With the SOLO, your monitors will
finally sound loud enough, everyone in the audience will understand each word, and the
mains will sound natural and transparent.
WHO NEEDS THE FBX?
Virtually every sound system will be improved with the FBX. Small bands that do not have
sound technicians can now increase their monitor volumes so they can hear themselves
clearly and with full fidelity, without worrying if the program is going to be ruined by
feedback.
Auditoriums and churches of all sizes will enjoy reliable feedback control. Hotels and
conference centers around the world can offer meeting rooms with sound systems that
won’t howl during programs. The SOLO can be installed in theaters, schools, sports
arenas, courtrooms -- anywhere multiple microphones are used. It can also be used for
teleconferencing, intercoms or interactive remote classrooms.
WHY THE FBX?
The simple beauty of the FBX is its ability to quickly and effectively eliminate feedback with
narrower filters than ever before possible. The FBX delivers superior sound quality auto-
matically.
ABOUT THE FBX...
QUICK-START OPERATION
For best results, read all operating instructions before using the FBX-SOLO. If you're
already familiar with the FBX or just want a basic overview of FBX operation, this simple
quick-start procedure is for you. More detailed instructions begin on page 9 inside this
operating guide.
1. Patch in the SOLO where appropriate for your model, and select the input/output level
on the back.
2. With gain down on the input channel, put the SOLO in ACTIVE mode (green bypass
LED), then slowly raise the channel gain to the point of feedback.
3. Raise the gain slowly until 5 FBX filters are set, then reduce gain slightly.
4. Adjust the CLIP LEVEL on the SOLO, and you're ready to go.
READ THE ENTIRE OPERATING GUIDE FOR COMPLETE INSTRUCTIONS.

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100 Hz
-15.00
-13.13
-11.25
-9.375
-7.500
-5.625
-3.750
-1.875
0.0 dBV
1K 10K
FREQUENCY RESPONSE:
Full Set-Up FBX vs. 1/3-Octave Graphic
Equalizer. Test procedure: A PA system was
set up using a microphone, mixer, FBX, power
amp and two speakers. The system's gain was
raised until the FBX removed six feedback points.
Next, the FBX was replaced with a 1/3-octave
graphic EQ. The EQ was adjusted while the
input was raised to the same level achieved with
the FBX. The frequency response curves of each
device were then plotted.
What this means to you: Doubling the cost of your
microphones, speakers and power amp probably
would not improve your system's frequency
response as much as replacing your EQ with an
FBX for chasing feedback.
12 dB
500 Hz 1000 Hz 2000 Hz
6 dB
0 dB
A DIRECT HIT ON FEEDBACK! The
FBX-SOLO targets feedback without taking
a big chunk out of your sound. Tests prove
that a single 1/3-octave EQ slider pulled
down 12 dB removes almost half the power
going to the speakers over a two-octave
range. And, as the illustration at right
shows, you can't place a graphic EQ filter
precisely on the ringing frequency. When
you pull down multiple sliders in a normal
setup (below), you end up with giant holes
in your sound. On the other hand, FBX
constant "Q" micro-filters are 10 times
narrower - you get back up to 90% of the
power you lose with a graphic EQ! That
means more gain before feedback and no
loss in sound quality.
Look for this symbol for
specific information on
the SL-620.
Look for this symbol for
specific information on
the SM-620.
HOW CAN THE SOLO BE USED?
Assign a SOLO to any specific mixer channel. You can also use the SM-620 to connect a
phantom-powered mic to a non-phantom-powered mixer.

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SL-620 Front & Back Panels
POWER
The ON/OFF power switch is a two-position push button switch.
The LEDs corresponding to all active filters will blink on power-
up.
FILTER WIDTH SWITCH
Switch to narrow 1/10-octave filters for music applications or to
wider 1/5-octave filters for spoken word applications. The
change takes effect only on power up. Selecting a new width
has no effect unless you power down and then power up again.
INPUT LOW/HIGH SWITCH
Switch to LOW for instrument or microphone in (use with low
level inputs such as piezo mics); this provides a 30dB boost in
the FBX's input gain structure. Switch to HIGH for insert or line
in (use with high level output instruments and signal proces-
sors).
OUTPUT UNITY/LINE SWITCH
Switch to UNITY (for level in=level out) for use with amplifiers
that accept low level signals, such as guitar amps. In the UNITY
setting the SL-620 has a system gain of 1 (input=output level).
Switch to LINE (for line level out) if your signal needs
preamping. In the LINE setting the gain is adjusted between 0
and +35dB (HIGH IN; +30 to +65dB LOW IN) via the clip level
adjust.
4
ACTIVE/BYPASS
In Active mode, the unit controls feedback automatically. The
two-color "BY" LED lights green when the unit is in Active mode
and lights red when in Bypass mode. The mic preamp remains
active in Bypass mode; only the FBX function is bypassed.
RESET
Press until the LEDs stop flashing to reset or clear all filters.
FILTER ACTIVITY
When one of the unit’s constant "Q" filters is activated, the
corresponding LED lights. A blinking LED indicates the filter
that was most recently activated.
LOCK FIXED FILTERS
When the "LOCK FIXED" button is pressed, its LED will light to
indicate that the FBX is in "LOCK FIXED" mode. "LOCK
FIXED" mode can be activated at any time after system setup
and will stay on until the button is pressed again and the LED
turns off. The dynamic filters are not affected.
CLIP LEVEL ADJUST
Adjust the clip level so that the clip LED blinks intermittently.
Higher levels will cause distortion, and lower levels will cause an
increase in sound system noise level. When the output level
switch is set to UNITY: The FBX combines input and output
levels into one control so there is no net gain or loss of signal
regardless of where the clip level is set. When the output level
switch is set to LINE: The FBX has an adjustable gain which
ranges from 0dB to +35dB.
12VDC ADAPTOR
The FBX external power supply (single unit power supply;
model #S-PSU1) is included with the unit. Use of any other
power supplies may cause permanent damage to the unit and
WILL VOID THE WARRANTY.
INPUTS & OUTPUTS
The connector labeled IN/OUT serves as both the unit's input
(tip) and output (ring) when used with a single TRS plug. When
used with a Y-cord, use the IN/OUT as the input and the
OUTPUT as the output.

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SM-620 Front & Back Panels
POWER
The ON/OFF power switch is a two-position push button switch.
The LEDs corresponding to all active filters will blink on power-
up.
LOCK FIXED FILTERS
When the "LOCK FIXED" button is pressed, its LED will light to
indicate that the FBX is in "LOCK FIXED" mode. "LOCK FIXED"
mode can be activated at any time after system setup and will
stay on until the button is pressed again and the LED turns off.
The dynamic filters are not affected.
FILTER ACTIVITY
When one of the unit’s constant "Q" filters is activated, the
corresponding LED lights. A blinking LED indicates the filter that
was most recently activated.
ACTIVE/BYPASS
In Active mode, the unit controls feedback automatically. The
two-color "BY" LED lights green when the unit is in Active mode
and lights red when in Bypass mode. Phantom power and the
mic preamp remain active in Bypass mode; only the FBX function
is bypassed.
RESET
Press until the LEDs stop flashing to reset or clear all filters.
FILTER WIDTH SWITCH
Switch to narrow 1/10-octave filters for music applications or to
wider 1/5-octave filters for spoken word applications. The change
takes effect only on power up. Selecting a new width has no effect
unless you power down and then power up again.
OUTPUT LO/HI SWITCH
In the LO setting, the SM-620 has unity gain (input=output); use
LO for mic level. In the HI setting, gain is adjustable between
-15dB and +20dB using the clip level adjust; use HI for line level,
or when you need to preamp the signal.
PHANTOM POWER ON/OFF SWITCH
The SM-620 is set to "PHANTOM POWER - OFF" at the factory.
If you wish to use phantom power, move the switch to "ON."
12VDC ADAPTOR
The FBX external power supply (single unit power supply;
model #S-PSU1) is included with the unit. Use of any other
power supplies may cause permanent damage to the unit and
WILL VOID THE WARRANTY.
INPUT
The input accepts balanced XLR-3 (PIN 2 high) plugs.
OUTPUT
Use balanced XLR-3 plugs (PIN 2 high) for balanced mixer line
inputs.
5
CLIP LEVEL ADJUST
Adjust the clip level so that the clip LED blinks intermittently.
Higher levels will cause distortion, and lower levels will cause an
increase in sound system noise level. When the output level
switch is set to UNITY: The FBX combines input and output
levels into one control so there is no net gain or loss of signal
regardless of where the clip level is set. When the output level
switch is set to LINE: The FBX has an adjustable gain which
ranges from -15dB to +20dB.

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SL-620: You can use the SL-620 with acoustic/electric guitars and guitar amplifiers, mixer
insert points, powered mixer patch points and high impedance mics. Note: In each of these
drawings, the output level could be set to line or unity depending on your situation. Use the
following wiring diagrams (presented in order of most common to least common
setup) as guides for setup:
SL-620,
Configuration 3
6
SL-620,
Configuration 1
SL-620,
Configuration 2
APPLICATIONS

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SL-620,
Configuration 6
SL-620,
Configuration 4
SL-620,
Configuration 5

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SM-620: Use the SM-620 with balanced microphones.
SM-620,
Configuration 1
SM-620,
Configuration 2

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The FBX automatic feedback controller improves any sound reinforcement system. By
following these simple instructions, you will be assured of the most benefit from your FBX
and sound system. The instructions presume that you are familiar with the fundamentals of
sound reinforcement. If any of the terms are not clear, or if the system does not perform as
expected, contact your local Sabine dealer for further information. Read on for a basic
explanation of FBX features you should understand before using your FBX.
POWERING UP
When connecting the power supply to the FBX-SOLO, angle the connector down,
then push the connector up into the input gently, with the lip facing up as shown. Do
not force the connector into or out of the FBX.
UNDERSTANDING FIXED & DYNAMIC FILTERS
The FBX has two types of constant "Q" filters: FIXED and DYNAMIC. Both filters are placed
the same way: Feedback is detected, and the filter is placed just deep enough to eliminate it.
The difference comes after the filter is placed. FIXED FILTERS are set automatically during
the initial setup and remain on the initially detected feedback tone -- they do not move. The
system’s gain before feedback is provided by the FIXED FILTERS; i.e., increasing the
number of FIXED FILTERS increases the system’s gain before feedback. The FBX's DY-
NAMIC FILTERS control intermittent feedback that occurs during the program; they can
release and move to new feedback frequencies and are for adaptive feedback control during
the performance. For many applications, the optimal setting is the one which gives
maximum gain - i.e., four FIXED and two DYNAMIC filters (default setting). However,
in some applications, such as use of wireless microphones, mobility is more impor-
tant than maximum gain. In this case, you may wish to have more dynamic than fixed
filters. Any combination is possible.
The filters can be reconfigured easily from the factory default setting (four fixed and two
dynamic) to any combination of fixed and dynamic filters. For example, the following
procedure will set three filters fixed and three dynamic:
1. Place the unit in BYPASS mode.
2. Power down the SOLO.
3. While depressing the RESET button, power up the unit.
4. Release the RESET button. The FILTER INDICATOR LEDs will now light in sequence.
5. When the third LED is lit, press the RESET button.
6. Notice that the first three LEDs flash three times to verify that they are now the fixed
filters.
Note: The fixed filters flash three times whenever the FBX is powered up.
BEFORE YOU BEGIN

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SL-620 SYSTEM INITIALIZING PROCEDURE
Choose the input level. Switch to LOW for instrument or microphone in (use with low
level inputs such as piezo mics); this provides a 30dB boost in the FBX's input gain struc-
ture. Switch to HIGH for insert or line in (use with high level output instruments and signal
processors).
Choose the output level. Switch to UNITY (for level in=level out) for use with
amplifiers that accept low level signals, such as guitar amps. In the UNITY setting the SL-
620 has a system gain of 1 (input=output level). Switch to LINE (for line level out) if your
signal needs preamping. In the LINE setting the gain is adjusted between 0 and +35dB via
the clip level adjust.
Follow these steps to obtain the maximum gain before feedback without changing the tonal
quality of your program. Set up only one SOLO at a time. The following instructions are for
using the SOLO on the mains. For use with monitors, substitute monitor send and master
monitor control for input channel level fader and mixer master output. Be sure to turn off the
mains when initializing the SOLO in your monitor system.
11. Place the speakers and microphones in the positions where they
will be used during the program. Avoid placing microphones
directly in front of speakers.
2. Set the mixer master output, all channel level faders, and the
monitors to minimum.
3. Turn on the SOLO.
4. Turn on the mixer, any signal processing equipment, and finally the
power amp. Press the SOLO's RESET button until the LEDs stop
flashing to clear out filters set previously.
5. If you are using a graphic EQ, adjust it only for the desired tonal
qualities. DO NOT NOTCH FOR FEEDBACK.
6. Be sure the SL-620 is in active mode. The "BY" LED will light green to
indicate the SL-620 is active and red if it is in bypass mode.
7. Turn the SOLO's clip level adjust to the two o'clock position.
8. Set the mixer master output to a nominal level, and lower all channel
levels to minimum.
9. Slowly raise the input channel level fader for the channel being set
until feedback occurs. The SL-620 should quickly remove the
feedback. The first FILTER LED will then blink to indicate a filter has
been set.
10. Keep raising the level slowly until all FIXED FILTERS and one dynamic filter is set. Any
uninitialized dynamic filters will be set later if feedback occurs during the program.
11. Now lower the channel level fader slightly so that the system is not on the verge of
another feedback point. This is the maximum volume level that the SL-620 will be able to
provide. Higher levels will cause uncontrollable feedback.
12. Finally, during sound check, adjust the CLIP LEVEL ADJUST so that the red CLIP LED
blinks intermittently, as you would adjust the recording level of a tape recorder. The unit
will clip and distort the program if the CLIP LEVEL ADJUST is set too high. If it is set too
low, the signal-to-noise ratio will degrade and the system may hiss. The best adjustment
occurs when the clip levels of the SOLO and the final power amp are matched (when the
clip level indicators blink at the same time).
SM-620 SYSTEM INITIALIZING PROCEDURE
Choose the output level. In the LO setting, the SM-620 has unity gain (input=output);
use LO for mic level. In the HI setting, gain is adjustable between -15dB and +20dB using the
clip level adjust; use HI for line level, or when you need to preamp the signal.
INSTRUCTIONS FOR OPERATION

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Select Phantom Power ON/OFF. Your SM is delivered from the factory with the
phantom power function disabled. If you wish to use phantom power, you may enable the
function by switching to "PHANTOM POWER - ON" on the back panel. The majority of low
impedance balanced non-phantom-powered mics are wired to ignore phantom power. Check
your microphone owner's manual for verification to avoid damage.
To initialize the SM-620:
Follow these steps to obtain the maximum gain before feedback without changing the tonal
quality of your program. Set up only one SOLO at a time. The following instructions are for
using the SOLO on the mains. For use with monitors, substitute monitor send and master
monitor control for input channel level fader and mixer master output. Be sure to turn off the
mains when initializing the SOLO in your monitor system.
1. Place the speakers and microphones in the positions where they will be used during the
program. Avoid placing microphones directly in front of speakers.
12. Set the mixer master output, all channel level faders, and the monitors to minimum.
13. Turn on the SOLO.
4. Turn on the mixer, any signal processing equipment, and finally the power amp. Press
the SOLO's RESET button until the LEDs stop flashing to clear out filters set previously.
15. If you are using a graphic EQ, adjust it only for the desired tonal qualities. DO NOT
NOTCH FOR FEEDBACK.
6. Be sure the SM-620 is in active mode. The "BY" LED will light green to indicate the SOLO
is in active mode and red if it is in bypass mode.
7. Turn the SOLO's clip level adjust to the two o'clock position.
8. Set the mixer master output to a nominal level, and lower all channel levels to minimum.
9. Slowly raise the channel level fader for the channel being set until feedback occurs. The
SM should quickly remove the feedback. The first FILTER LED will then blink to indicate
a filter has been set.
10. Keep raising the channel level fader slowly until all FIXED FILTERS and one dynamic
filter is set. Any uninitialized dynamic filters will be set later if feedback occurs during the
program.
11. Now lower the channel level fader slightly so that the system is not on the verge of
another feedback point. This is the maximum volume level the SM will be able to provide.
Higher levels will cause uncontrollable feedback.
12. Finally, during sound check, adjust the CLIP LEVEL ADJUST so that the red CLIP LED
blinks intermittently, as you would adjust the recording level of a tape recorder. The unit
will clip and distort the program if the CLIP LEVEL ADJUST is set too high. If it is set too
low, the signal-to-noise ratio will degrade and the system may hiss. The best adjustment
occurs when the clip levels of the SOLO and the final power amp are matched (when the
clip level indicators blink at the same time).
HOW TO USE THE "LOCK FIXED" FEATURE
In certain situations the FBX may mistake music for feedback and drive the fixed filters
deeper than necessary, like in a church with a pipe organ or during a performance with a
great deal of intentional sustained electric guitar feedback. You may prevent the fixed filters
from deepening beyond their initial depth by pressing the "LOCK FIXED" button on the front
panel AFTER setting the fixed filters as described previously. The "LOCK FIXED" LED will
light to indicate that the FBX is in "LOCK FIXED" mode. The fixed filters will stay locked until
you press the "LOCK FIXED" button again. The dynamic filters are not affected. In almost
every situation, it is best to lock the fixed filters right after the initial setup.
LIMITING THE TOTAL NUMBER OF ACTIVE FILTERS
You may choose to limit the total number of active filters for each application by using the
"LOCK FIXED" button. For example, if you wish to use only three fixed and one dynamic
filter, set the FBX so there are five fixed and one dynamic filter. Then during the setup
procedure, simply press the "LOCK FIXED" button after setting the first three fixed filters.
The remaining two fixed filters will be locked in their zero position.
SELECTING FILTER WIDTH
If the SOLO is to be used for a music application, 1/10-octave filters are most effective.
However, in spoken word applications, such as lectures or teleconferencing, the wider 1/5-

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octave filters are recommended. Select the filter width using the switch on the SOLO back
panel. The change takes effect only on power-up. Selecting a new width has no effect unless
you power down and then power up again.
ENGAGING THE NOISE GATE
One outstanding feature of your FBX-SOLO is a user-selectable noise gate. It acts as an
automatic switch that opens a microphone only when someone is speaking directly into it. A
noise gate is especially useful in systems that have a number of open microphones, such as
courtrooms, conference rooms, or parliament buildings. Gating microphones greatly reduces
the number of possible feedback points in the room and allows for more system gain.
The level that turns the noise gate on and off is called the threshold. If the level coming into
the gate is greater than the threshold, the noise gate opens, and the mic is turned
on. If it is less than the threshold, the noise gate closes, and the mic is turned off.
You can adjust your SOLO to four different threshold levels (see diagram at left),
or turn it off. To select the threshold, power down the SOLO. Hold in the LOCK
FIXED button, and power up the SOLO. The clip level LEDs will light in se-
quence. Select the threshold level by pressing the LOCK FIXED button again
when the clip LED lights at the corresponding threshold level. The noise gate is
now enabled, indicated by a flashing level LED on power-up. Pressing the
LOCK FIXED button with no clip LEDs lighted turns off the noise gate. If no lights
flash on power-up, the noise gate is not engaged. When the SOLO's noise gate is
enabled, it will not become engaged until after you've set all fixed filters and one dynamic
filter (if the SOLO is configured for any).
USING SABINE'S OPTIONAL SOLO ACCESSORIES
1-U rack tray (model #SL6RACK): An optional 1-U rack tray holds up to six SOLOs. Mount
the SL-620s, SM-620s, or a combination of both side by side on the tray. Use only Sabine
supplied screws; use of any other screws may damage the SOLO and void the war-
ranty.
IMPORTANT OPERATING CONSIDERATIONS
MEMORY:
The FBX stores the positions and depths of the filters in nonvolatile internal memory when the
unit is turned off or during a power failure. The unit will return all filters to their previous
frequencies and depths when it is turned back on.
BYPASS MODE:
Placing the FBX-SOLO in bypass mode only shuts down the FBX function; the microphone
preamp still functions when the unit is in bypass mode. The SOLO will not pass signal if the
power is off in either active or bypass mode.
RESETTING THE FILTERS:
The user must reset the FBX if the microphones or speakers are moved significantly. To reset
the unit, press RESET until the LEDs stop flashing.

Q. Can I patch the SOLO SL-620 after the mixer and before the power amp, just like other
FBX models?
A. Yes, but only in cases where just six feedback filters are needed, such as on the moni-
tors alone. Six FBX filters may not provide enough gain before feedback for your entire
mix.
Q. Sometimes I don't get enough gain before feedback. Why?
A. Gain before feedback is determined by the number of fixed filters you set; increasing the
number of fixed filters during setup increases the system's gain before feedback. Fixed
filters are set automatically during the initial setup and remain on the initially detected
feedback tone -- they do not move. You can reconfigure the filters from the factory
default setting (four fixed and two dynamic) to any combination of fixed and dynamic
filters. Review the procedure on page 9 ("UNDERSTANDING FIXED AND DYNAMIC
FILTERS") of this operating guide.
Q. The CLIP LEVEL LEDs do not light. The unit will not catch feedback. Why?
A. The unit is not in the signal path. Check the connections.
Q. Why does one of the FILTER ACTIVITY LEDs blink?
A. The last filter to be automatically updated blinks. During normal operation, the blinking
will move from filter to filter as the SOLO finds new feedback points. This gives the user
a visual confirmation that the unit is functioning properly.
Q. Why would the FBX cause a noticeable hum?
A. It may hum if the system is improperly grounded. Check for bad grounds.
Q. Why does my system sound thin and muffled?
A. Place the SOLO in BYPASS MODE. If the system still sounds thin, your problem is
probably with improper use of a graphic EQ. If the problem exists only with the SOLO in
ACTIVE mode, verify the clip level setting, reinitialize the system and lock the fixed
filters.
Q. With the SL-620 in the insert point, I hear no audio. Why?
A. Your insert point may be wired opposite to the SOLO. Try reversing the tip and ring (in
and out) of your Y-cord. If you are using a single TRS cable, you will have to reconfigure
one end of it to conform to your mixer insert point.
Q. Will the SOLO eliminate feedback in both mains and monitors?
A. Yes, but for maximum gain you should set as many fixed filters as possible on the
system with the most feedback problems. Choose which system is more likely to have
feedback, and follow the system initializing procedure for either mains or monitors.
During program, the dynamic filters will control feedback for both mains and monitors if
they are in use, but only on the input channel the SOLO is patched into.
Q. The channel I have the SOLO in seems noisy. What can I do?
A. If the noise floor is too high, you need to readjust the gain structure of that channel.
Follow the SOLO initialization instructions in this guide.
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13
TROUBLESHOOTING TIPS

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14
ENGINEERING SPECIFICATIONS
FILTERSFILTERS
FILTERSFILTERS
FILTERS
Six independent digital notch filters controlled automatically from
51Hz to 17,000Hz
Filter width: 1/10 octave, typical, or 1/5-oct. selectable; constant "Q"
Filter depth: DSP controlled, variable to -50dB
Resolution: 1Hz from 51Hz to 17KHz
Time required to find and eliminate feedback: 0.4 seconds,
typical @ 1KHz
Total number of combined filters active: User selectable, from 1
to 6
Number of Dynamic vs. Fixed filters: User selectable
Last configuration stored in memory
INPUT/OUTPUT - SL-620 ONLYINPUT/OUTPUT - SL-620 ONLY
INPUT/OUTPUT - SL-620 ONLYINPUT/OUTPUT - SL-620 ONLY
INPUT/OUTPUT - SL-620 ONLY
I/O Connectors:1/4" TRS; tip=input, ring=output, sleeve=ground
Input Impedance:Unbalanced >1 meg Ohm
Output Impedance: Unbalanced 10 Ohms nominal; Maximum load
2K Ohms
Maximum Input/Output Level at lowest gain: +20 dBV
Gain Range (with line out selected): 0 to +35 dB (high in), +30 to
+65 dB (low in)
Input to Output Gain @ unity setting: +/- 0.5 dBV
Bypass: Digital
INPUT/OUTPUT - SM-620 ONLYINPUT/OUTPUT - SM-620 ONLY
INPUT/OUTPUT - SM-620 ONLYINPUT/OUTPUT - SM-620 ONLY
INPUT/OUTPUT - SM-620 ONLY
I/O Connectors:XLR-3 PIN 2 high Balanced
Input Impedance:1K Ohm nominal
Output Impedance: Unbalanced 10 Ohms nominal; Maximum load
2K Ohms
Maximum Input/Output Level at lowest gain: -10 dBV**
EXPOSURE TO EXTREMELY HIGH NOISE LEVELS MAY CAUSE A PERMANENT
HEARING LOSS. INDIVIDUALS VARY CONSIDERABLY IN SUSCEPTIBILITY TO
NOISE INDUCED HEARING LOSS, BUT NEARLY EVERYONE WILL LOSE SOME
HEARING IF EXPOSED TO SUFFICIENTLY INTENSE NOISE FOR A SUFFICIENT
TIME. THE U.S. GOVERNMENT'S OCCUPATIONAL SAFETY AND HEALTH
ADMINISTRATION (OSHA) HAS SPECIFIED THE FOLLOWING PERMISSIBLE
NOISE LEVEL EXPOSURES:
DURATION/DAY IN HOURS SOUND LEVEL IN dBA, SLOW RESPONSE
890
692
495
397
2 100
1-1/2 102
1 105
1/2 110
1/4 or less 115
ACCORDING TO OSHA, ANY EXPOSURE IN EXCESS OF THE ABOVE
PERMISSIBLE LIMITS COULD RESULT IN HEARING LOSS. EAR PLUGS OR
PROTECTORS IN THE EAR CANALS OR OVER THE EARS MUST BE WORN
WHEN OPERATING THIS DEVICE IN ORDER TO PREVENT A PERMANENT
HEARING LOSS. IF EXPOSURE IS IN EXCESS OF THE LIMITS AS SET FORTH
ABOVE, TO ENSURE AGAINST POTENTIALLY DANGEROUS EXPOSURE TO
HIGH SOUND PRESSURE LEVELS, IT IS RECOMMENDED THAT ALL PERSONS
EXPOSED TO EQUIPMENT CAPABLE OF PRODUCING HIGH SOUND
PRESSURE LEVELS SUCH AS THIS DEVICE BE PROTECTED BY HEARING
PROTECTORS WHILE THIS UNIT IS IN OPERATION.
1. Read all safety and operating instructions before using this product.
2. All safety and operating instructions should be retained for future reference.
3. Obey all cautions in the operating instructions and on the unit.
4. All operating instructions should be followed.
5. This product should not be used near water, i.e a bathtub, sink, swimming pool,
wet basement, etc.
6. This product should be located so that its position does not interfere with its
proper ventilation. It should not be placed flat against a wall or placed in a built-in
enclosure that will impede the flow of cooling air.
7. This product should not be placed near a source of heat such as a stove or
radiator.
8. Connect only to a power supply of the type marked on the unit adjacent to the
power.
9. Never break off the ground pin on the power supply cord.
10. Power supply cords should always be handled carefully. Never walk or place
equipment on power supply cords. Periodically check cords for cuts or signs of
stress, especially at the plug and the point where the cord exits the unit.
11. The power supply cord should be unplugged when the unit is to be unused for
long periods of time.
12. Care should be taken so that objects do not fall and liquids are not spilled into
the unit through the ventilation holes or any other openings.
13. This unit should be checked by a qualified service technician if:
A. The power supply cord or plug has been damaged.
B. Anything has fallen or been spilled into the unit.
C. The unit does not operate correctly.
D. The unit has been dropped or the enclosure damaged.
14. The user should not attempt to service this equipment. All service work should
be done by a qualified service technician. OSHA 2201; 1995 revised.
CAUTION:
*Below approximately 200Hz the feedback filters become slightly wider to increase the feedback and rumble capture speed at these low frequencies.
**Note: Inputs may be balanced or unbalanced.
***Tests performed using an Audio Precision System One model 322 or equal.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.
Gain Range: -15 to +20dB (at high output)
Input to Output Gain @ unity setting: +/- 0.5 dBV
Bypass: Digital
EIN: -105dBm @ 150 Ohms, 20Hz-17KHz or better
Phantom Power: 48V switch selectable
PERFORMANCE***PERFORMANCE***
PERFORMANCE***PERFORMANCE***
PERFORMANCE***
Frequency Response:< +0.75dB, 20Hz to 17,000Hz
Signal to Noise Ratio: >87dB typical
Total Harmonic Distortion:<0.02% @ 1KHz @ any gain setting
Dynamic Range:>92dB
NOISE GATENOISE GATE
NOISE GATENOISE GATE
NOISE GATE
Attack Time:Fixed (400mS)
Threshold:Selectable (-24dB, -36dB, -48dB, -60dB)
POWER SUPPLYPOWER SUPPLY
POWER SUPPLYPOWER SUPPLY
POWER SUPPLY
8-20VDC @ 400 mA
MEMORY BATTERY LIFEMEMORY BATTERY LIFE
MEMORY BATTERY LIFEMEMORY BATTERY LIFE
MEMORY BATTERY LIFE
7 years, typical
DIMENSIONSDIMENSIONS
DIMENSIONSDIMENSIONS
DIMENSIONS
1-U height, 1/6-RU width; 2.78 x 1.65 x 5.5 in. (6.95 x 4.13 x 13.75 cm)
WEIGHTWEIGHT
WEIGHTWEIGHT
WEIGHT
9 oz. (0.26 kg)
OPTIONSOPTIONS
OPTIONSOPTIONS
OPTIONS
SL6RACK Rack Tray (holds up to six units)

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15
ONE-YEAR LIMITED WARRANTY:
THIS LIMITED WARRANTY VALID ONLY WHEN PURCHASED AND
REGISTERED IN THE UNITED STATES OR CANADA. ALL EX-
PORTED PRODUCTS ARE SUBJECT TO WARRANTY AND
SERVICES TO BE SPECIFIED AND PROVIDED BY THE AUTHO-
RIZED DISTRIBUTOR FOR EACH COUNTRY.
Ces clauses de garantie ne sont vaiables qu’aux Etats-Unis et au
Canada. Dans tous les autres pays, les clauses de garantie et de
maintenance sont fixees par le distributeur national et assuree par lui
selon la legislation en vigueur.
Diese Garantie ist nur in den USA and Kanada gultig. Alle Export-
Produkte sind der Garantie und dem Service des Importeurs des
jewelligenLandesuntervorfen.
Esta garantia es valida solamente cuando el producto es comprado en
E.U. continentales o en Canada. Todos los productos que sean
comprados en el extranjero, estan sujetos a las garantias y servicio que
cada distribuidor autorizado determine y otrezca en los diterentes paises.
ONE-YEARLIMITEDWARRANTY/REMEDY
SABINE, INC. (“SABINE”) warrants this product to be free from defects in
material and workmanship for a period of one (1) year from date of
purchase PROVlDED, however, that this limited warranty is extended only
to the original retail purchaser and is subject to the conditions, exclusions
and limitations hereinafter set forth:
CONDITIONS, EXCLUSIONS AND LIMITATIONS OF LIMITED
WARRANTIES
These limited warranties shall be void and of no effect if:
a. The first purchase of the product is for the purpose of resale; or
b. The original retail purchase is not made from an AUTHORIZED
SABINEDEALER; or
c. The product has been damaged by accident or unreasonable use,
neglect, improper service or maintenance, or other causes not arising out
of defects in material or workmanship; or
d. The serial number affixed to the product is altered, defaced or
removed; or
e. The power supply grounding pin is removed or otherwise defeated. In
the event of a defect in material and/or workmanship covered by this
limited warranty, Sabine will repair the defect in material or workmanship
or replace the product, at Sabine’s option; and provided, however, that, in
any case, all costs of shipping, if necessary, are paid by you, the
purchaser.
THE WARRANTY REGISTRATION CARD SHOULD BE ACCU-
RATELY COMPLETED, MAILED TO AND RECEIVED BY SABINE
WITHIN FOURTEEN (14) DAYS FROM THE DATE OF YOUR
PURCHASE.
In order to obtain service under these warranties, you must:
a. Bring the defective item to any AUTHORlZED SABlNE DEALER and
present therewith the ORIGINAL PROOF OF PURCHASE supplied to you
by the AUTHORIZED SABINE DEALER in connection with your purchase
from him of this product. If the DEALER is unable to provide the
necessary warranty service, you will be directed to the nearest other
SABINE AUTHORIZED DEALER which can provide such service.
OR
b. Call Sabine for a RETURN AUTHORIZATION NUMBER and ship the
defective item, prepaid, to:
SABINE,INC.
13301 HIGHWAY 441
ALACHUA, FL 32615-8544 USA
including therewith a complete, detailed description of the problem,
together with a legible copy of the original PROOF OF PURCHASE and a
complete return address. Upon Sabine’s receipt of these items:
If the defect is remedial under the limited warranties and the other terms
and conditions expressed have been complied with, Sabine will provide
the necessary warranty service to repair or replace the product and will
return it, FREIGHT COLLECT, to you, the purchaser.
Sabine’s liability to the purchaser for damages from any cause whatso-
ever and regardless of the form of action, including negligence, is limited
to the actual damages up to the greater of $500.00 or an amount equal to
the purchase price of the product that caused the damage or that is the
subject of or is directly related to the cause of action. Such purchase
price will be that in effect for the specific product when the cause of
action arose. This limitation of liability will not apply to claims for personal
injury or damage to real property or tangible personal property allegedly
caused by Sabine’s negligence. Sabine does not assume liability for
personal injury or property damage arising out of or caused by a non-
Sabine alteration or attachment, nor does Sabine assume any responsibil-
ity for damage to interconnected non-Sabine equipment that may result
from the normal functioning and maintenance of the Sabine equipment.
UNDER NO CIRCUMSTANCES WILL SABINE BE LIABLE FOR ANY
LOST PROFITS, LOST SAVINGS, ANY INCIDENTAL DAMAGES OR
ANY CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
INABILITY TO USE THE PRODUCT, EVEN IF SABINE HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
THESE LIMITED WARRANTIES ARE IN LIEU OF ANY AND ALL
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR USE; PROVIDED, HOWEVER,
THAT IF THE OTHER TERMS AND CONDITIONS NECESSARY TO
THE EXISTENCE OF THE EXPRESS LIMITED WARRANTIES, AS
HEREINABOVESTATED, HAVE BEENCOMPLIED WITH, IMPLIED
WARRANTIES ARE NOT DISCLAIMED DURING THE APPLICABLE
ONE-YEAR PERIOD FROM DATE OF PURCHASE OF THIS PRODUCT.
SOME STATES DO NOT ALLOW LIMITATION ON HOW LONG AN
IMPLIED WARRANTY LASTS, OR THE EXCLUSION OR LIMITATION
OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE
LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO YOU. THESE
LIMITED WARRANTIES GIVE YOU SPECIFIC LEGAL RIGHTS, AND
YOU MAY ALSO HAVE OTHER RIGHTS WHICH MAY VARY FROM
STATE TO STATE.
THESE LIMITED WARRANTIES ARE THE ONLY EXPRESS
WARRANTIES ON THIS PRODUCT, AND NO OTHER STATEMENT,
REPRESENTATION, WARRANTY OR AGREEMENT BY ANY PERSON
SHALL BE VALID OR BINDING UPON SABINE.
In the event of any modification or disclaimer of express or implied
warranties, or any limitation of remedies, contained herein conflicts with
applicable law, then such modification, disclaimer or limitation, as the case
may be, shall be deemed to be modified to the extent necessary to
comply with such law.
Your remedies for breach of these warranties are limited to those
remedies provided herein, and Sabine gives this limited warranty only with
respect to equipment purchased in the United States of America.
INSTRUCTIONS-WARRANTY REGISTRATION CARD
1. Mail the completed WARRANTY REGISTRATION CARD to:
SABINE,INC.
13301 HIGHWAY 441
ALACHUA, FL 32615-8544 USA
a. Keep the PROOF OF PURCHASE. In the event warranty service is
required during the warranty period, you will need this document.There
will be no identification card issued by Sabine, Inc.
2. IMPORTANCE OF WARRANTY REGISTRATION CARDS AND
NOTIFICATION OF CHANGES OF ADDRESS:
a. Completion and mailing of WARRANTY REGISTRATION CARDS -
Should notification become necessary for any condition that may require
correction, the REGISTRATION CARD will help ensure that you are
contacted and properly notified.
b. Notice of address changes - If you move from the address shown on
the WARRANTY REGISTRATION CARD, you should notify Sabine of the
change of address so as to facilitate your receipt of any bulletins or other
forms of notification which may become necessary in connection with any
condition that may require dissemination of information or correction.
3. You may contact Sabine directly by telephoning [phone].
4. Please have the Sabine product name and serial number available
when communicating with Sabine Customer Service.

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MADE IN USA.
Manufactured by: Sabine, Inc. • 13301 Highway 441 • Alachua, FL 32615-8544 USA •
Phone: [phone] • Fax: [phone] • www.sabineinc.com 12/3/96