Tapco Musical Instrument SQ2 User Manual

GATE  
COMPRECSHASNONERL 1  
/
LIMITER  
AIR  
GAIN REDUCTION(dB)  
GATE  
COMPRECSHASNONERL 2  
/
LIMITER  
AIR  
30 20 15 10  
6
4
2
1
-
-
0
-
-
0
30  
10  
2.5  
50  
0.5  
0.3  
30  
10  
2.5  
50  
0.5  
0.3  
-
-
-
-
+
6
-
-
-
-
+
6
50  
15  
20  
0
2
5
10  
100  
1
6
50  
15  
20  
0
2
5
10  
100  
1
6
ON  
CH  
CH  
1
2
+
+
10  
1.5  
10  
1.5  
-
-
-
+
-
-
-
+
70  
0
30  
8
1
150 0.1  
200 50ms  
2
14  
14  
70  
0
30  
8
1
150 0.1  
200 50ms  
2
14  
14  
BY  
CH  
1
CH  
2
+
-
+
-
+
+
-
+
-
20  
+
OFF  
10  
CLOSE  
THRESHOLD THRESHOLD  
40  
20  
1
LIM 0.1  
3
20  
20  
OFF  
10  
CLOSE  
THRESHOLD THRESHOLD  
40  
20  
1
LIM 0.1  
3
20  
OFF  
FULL  
AUTO  
IN  
AUTO  
IN  
OFF  
FULL  
SQ•2  
ms  
sec  
ms  
sec  
dBu  
dBu  
n:1  
dB  
dBu  
dBu  
n:1  
dB  
AUTO  
IN/OUT  
CHAN  
1
AUTO  
IN/OUT  
CHAN  
2
IN/OUT  
IN/OUT  
POWER  
RATIO  
ATTACK  
RELEASE  
OUTPUT  
LEVEL  
RATIO  
ATTACK  
RELEASE  
OUTPUT  
LEVEL  
AC 100-120V, 60Hz  
AC 200-240V, 50HZ  
RATED INPUT: 12.5W  
SERIAL /DATE CODE  
OUTPUT  
INPUT SIDE CHAIN  
OUTPUT  
INPUT SIDE CHAIN  
=
=
=
=
TIP  
INPUT  
TIP  
INPUT  
BAL/  
UNBAL  
BAL/  
UNBAL  
RING  
OUTPUT  
BAL/  
UNBAL  
BAL/  
UNBAL  
RING  
OUTPUT  
=
=
SLEEVE GROUND  
SLEEVE GROUND  
WWW.TAPCOGEAR.COM  
BROUGHT TO YOU BY THE GROOVY  
AC FUSE  
0.315A  
FOLKS IN WOODINVILLE, WA, USA  
MANUFACTURED IN CHINA  
"TAP  
CO" AND "MACKIE" ARE REGISTERED  
T
TRADEMARKS OF LOUD TECHNOLOG  
IES INC.  
COPYRIGHT ©2003  
CHANNEL  
2
CHANNEL  
1
by  
 
18. Exposure to extremely high noise levels may cause permanent  
hearing loss. Individuals vary considerably in susceptibility to  
noise-induced hearing loss, but nearly everyone will lose some  
hearing if exposed to sufciently intense noise for a period of  
time. The U.S. Governments Occupational Safety and Health  
Administration (OSHA) has specied the permissible noise  
level exposures shown in the following chart.  
According to OSHA, any exposure in excess of these permissible limits  
could result in some hearing loss. 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  
use hearing protectors while the equipment is in operation. Ear plugs or  
protectors in the ear canals or over the ears must be worn when operating  
the equipment in order to prevent permanent hearing loss if exposure is in  
excess of the limits set forth here.  
Duration Per Day Sound Level dBA,  
Typical  
Example  
In Hours  
Slow Response  
8
90  
Packed garage concert  
6
92  
4
95  
VW Bus Peace Train  
3
97  
2
100  
102  
105  
110  
115  
Cranked psychedelic tunes  
High speed chase on C.H.I.P.s  
Loudest parts at a Heavy Metal concert  
1.5  
1
0.5  
0.25 or less  
What me, read a manual?  
Before you begin, please make sure you read the Safety Instructions on page 2 and  
Getting Started on page 4.  
Your new TAPCO® SQ2 is designed to set up quickly and operate easily. We know its  
often seen as a sign of weakness to read a manual, along with asking for directions when  
lost, but maybe you can read the rest when nobody is looking.  
It is important to keep your receipt in a safe place, and not a bad idea to write your  
product information here for future reference (i.e., insurance claims, tech support, return  
authorization, etc.).  
Product Serial #:  
Purchased at:  
Date of purchase:  
Part No. 0009426 Rev. A 1/04  
©2004 LOUD Technologies Inc. All Rights Reserved.  
3
 
Getting Started  
The following steps will help you set up your SQ2, and get the  
levels just right.  
SETTINGS:  
1. Be sure the SQ2s POWER switch is off.  
SET THE CONTROLS:  
1. Make sure your signal source is turned up and  
delivering signal to the SQ2. The signal should  
pass through the SQ2 unaffected because the  
CHAN 1 and 2 IN/OUT buttons are out and the  
signal processing circuitry is bypassed.  
2. Turn all the controls to their center positions (12 oclock)  
and set all the switches out.  
CONNECTIONS:  
2. Push in the CHAN 1 and 2 IN/OUT buttons to  
enable the gate and compressor circuits. If the  
input signal is above 10 dBu, the compressor/  
limiter will begin working on the signal because  
the THRESHOLD control is set at 10 dBu (center  
position). You should see the GAIN REDUCTION  
meters indicating the amount of gain reduction  
being applied to the signal. Turn down the  
THRESHOLD control to see more compression.  
1. Using balanced or unbalanced cables, connect  
your mixers main outputs to the SQ2s inputs, and  
the SQ2s outputs to your ampliers (or powered  
speakers) inputs.  
If you are using the SQ2 in a channels insert,  
connect your mixers channel insert to the SQ2s  
INPUTs and OUTPUTs.  
Refer to page 11 to learn how to connect and use  
the SIDE CHAIN feature.  
3. If the input signal is below 30 dBu, the gate will  
close and attenuate the signal because the  
THRESHOLD control is set at 30 dBu (center). Turn  
down the GATE THRESHOLD control until the gate  
opens (the CLOSE LED will turn off).  
Note: The SQ2 Compressor/  
Limiter/Gate is designed to be  
inserted in-linewith the signal as  
a serial device. This means that the  
LOOK  
entire signal is routed through the  
CLOSER  
4. Read on to learn how to set each individual  
control to get the best performance from your  
SQ2.  
processor, in contrast to a parallel  
device where the processed signal is mixed back  
with the unprocessed signal, like a reverb or echo.  
Things To Remember:  
2. Connect the cables using either XLR or 1/4TRS  
connectors (balanced), or 1/4TS connectors  
(unbalanced).  
When you shut down your  
equipment, turn off the ampliers  
rst. When powering up, turn on the  
ampliers last.  
The XLR and TRS inputs for each channel are  
wired in parallel. Use only one input per channel.  
Save the shipping box and  
packing material! You may need it  
someday.  
The XLR and TRS outputs for each channel are  
wired in parallel.  
The balanced XLR connectors are wired as  
follows:  
Pin 1 = shield (ground)  
Pin 2 = hot (+)  
Pin 3 = cold ()  
The 1/4TRS connectors are wired as follows:  
Tip = hot (+)  
Ring = cold ()  
Sleeve = shield (ground)  
3. Plug all the sound system components into suitable  
AC outlets, properly grounded and capable of  
delivering adequate current.  
4. Turn all the equipment on. If you are monitoring the  
signal through speakers, turn the power amplier  
on last to avoid running any pops or thumps  
through your speakers.  
4
 
Contents  
Safety Instructions................................................................2  
Getting Started....................................................................4  
Introduction..........................................................................6  
Hookup Diagrams................................................................8  
Typical Hookup: In-line with Main Outputs.....................8  
Alternate Hookup: Individual Channel or Main Inserts ..8  
SQ•2 Features .....................................................................9  
FRONT PANEL FEATURES .................................................9  
GATE...........................................................................9  
1. THRESHOLD.......................................................9  
2. CLOSE LED .......................................................9  
COMPRESSOR/LIMITER..............................................9  
3. THRESHOLD.......................................................9  
4. RATIO.................................................................9  
5. ATTACK..............................................................9  
6. RELEASE ............................................................9  
7. AUTO IN/OUT....................................................9  
8. OUTPUT..............................................................9  
9. CHAN IN/OUT...................................................9  
AIR Filter ...................................................................10  
10. LEVEL.............................................................10  
11. GAIN REDUCTION Meters.................................10  
12. POWER Switch...................................................10  
REAR PANEL FEATURES..................................................10  
13. Line Cord Socket and Fuse..............................10  
14. AC Select Switch ..............................................10  
15. OUTPUT...............................................................11  
16. INPUT ..................................................................11  
17. SIDE CHAIN .......................................................11  
GENERAL PRECAUTIONS AND CONSIDERATIONS .....11  
Rack Mounting........................................................11  
Thermal Considerations .........................................11  
AC Power Considerations......................................11  
Appendix A: Service Information ....................................12  
Warranty Service..........................................................12  
Troubleshooting............................................................12  
Repair ............................................................................13  
Appendix B: Connections ................................................14  
Appendix C: Technical Info..............................................15  
SQ•2 Specifications ....................................................15  
SQ•2 Block Diagram....................................................16  
TAPCO LIMITED WARRANTY...............................................19  
for more information about this and other TAPCO products.  
5
 
Introduction  
®
Thank you for choosing a TAPCO Squeezdynamics processor  
®
by Mackie . The TAPCO product line hails back to the days of TAPCO  
Corporation, Greg Mackies rst company. TAPCO revolutionized  
the audio industry back in 1969 with the very rst 6-channel mixer  
specically designed for keyboards and rock Nroll PA.  
In essence, TAPCO redened the price performance ratio and made  
high-quality professional audio mixers accessible to virtually anyone.  
Today, TAPCO is reborn with the same ideals and is backed by the  
world-class engineering and manufacturing horsepower of Mackie. The  
TAPCO SQ2 is the rst compressor/limiter/gate processor in the TAPCO  
by Mackie® family.  
TAPCO version of Greg  
About Dynamic Processing  
The human ear has an incredible dynamic range (the difference between the softest  
and the loudest sounds) and can detect anything from the sound of a buttery sneeze  
(0 dB SPL, the threshold of hearing) to the sound of the space shuttle taking off (140 dB  
SPL, very painful without hearing protection). Audio electronics would like to be able to  
duplicate this dynamic range, but current technology falls somewhat short.  
Audio electronics introduces another limitation to dynamic range: noise. Even the best  
designed audio circuits produce noise due to the physics of electrons moving through  
conductors and resistors. Its called thermal noise, and produces that low level hiss you hear  
when you turn the volume controls all the way up on a mixer or on your stereo system at  
home.  
An experienced sound engineer knows that the louder the mix, the less perceptible the  
noise oor, because the louder sounds mask the noise. However, mixing at loud levels brings  
the signal closer to the point of clipping, where the signal can go no larger. Ideally, you  
would like to provide 10 to 20 dB of headroom between the nominal operating level and  
the clipping point, to provide a cushion for transient peaks (bass drum beats and cymbal  
crashes, for example) to get through without clipping. But then the soft passages may  
become too quiet and the noise oor becomes a factor. Enter dynamic processing.  
The Compressor/Limiter  
Wouldnt it be nice if you could have a hand on the faders and be able to quickly  
reduce the volume on the bass drum and cymbals every time they approached clipping,  
then quickly return them to their normal levels? A compressor does exactly that. Set the  
threshold control to the point where you want the signal to stop getting any louder, and  
set the ratio control to regulate the amount of attenuation applied to the signal when it  
goes above the threshold. When the ratio control is turned all the way up, it becomes a  
limiter and the signal stops getting any louder when it reaches the threshold. The attack  
and release controls are used to control how fast the compressor kicks in when the signal  
crosses the threshold and how fast it stops acting on the signal when it drops below the  
threshold. You can experiment with these controls to get the most natural sound, or simply  
push in the AUTO button and the SQ2 automatically adjusts the attack and release  
according to the dynamics of the signal.  
TAPCO van (a.k.a. micro bus)  
6
 
The Gate/Expander  
Typically, a gate is used to turn off a channel when there is no signal to reduce the  
overall noise level of the mix. When the signal drops below a certain level determined  
by the threshold control, it is turned off. When the signal comes back up and crosses the  
threshold, the level returns to normal. One problem with using a gate is that if the threshold  
is set too low, ambient sounds will cause the gate to turn on and off, which can be audible,  
and if the threshold is set too high, as a sound fades it will suddenly drop out, resulting in an  
unatural fade.  
Downward expansion can help solve this problem. When the signal level falls below the  
threshold, it is slightly attenuated. The further the signal falls below the threshold, the more  
it is attenuated. The expander in the SQ2 automatically adjusts the ratio of the expansion  
based on the type of program that it sees.  
The Squeez Seriesof processors are powerful and tough. They are designed to  
withstand the punishing rigors of the road and continue to perform day after day, year  
after year.  
Heres a quick glance at the features packed into the SQ2:  
2-channel compressor/gate with smooth, musical sound  
Automatic Soft Knee/Hard Knee curves depending on the compression setting  
Adjustable AIR Filter to enhance the high frequencies after compression  
Soft Gate/Expander for imperceptible gating  
Individual Threshold, Ratio, Attack, and Release controls on each channel  
Output gain compensation control on each channel to add gain back to the compressed signal  
Auto Attack/Release button with indicator on each channel  
Individual IN/OUT button with indicator for each channel  
Precision 8-segment gain reduction meters  
Balanced/unbalanced 1/4" TRS and XLR line input and output jacks  
Side Chain connections  
Selectable line voltage  
7
 
Hookup Diagrams  
Typical Hookup:  
In-line with Main Outputs  
FROM MIXING CONSOLE  
LEFT AND RIGHT MAIN OUTPUTS  
SERIAL/DATE CODE  
AC~120V/60Hz  
OUTPUT  
INPUT SIDE CHAIN  
OUTPUT  
INPUT SIDE CHAIN  
=
=
=
=
TIP  
INPUT  
TIP  
INPUT  
BAL/  
UNBAL  
BAL/  
UNBAL  
RING  
OUTPUT  
BAL/  
UNBAL  
BAL/  
UNBAL  
RING  
OUTPUT  
=
=
SLEEVE GROUND  
SLEEVE GROUND  
WWW.TAPCOGEAR.COM  
AC FUSE  
BROUGHT TO YOU BY THE GROOVY FOLKS IN WOODINV  
ILLE, WA, USA  
"TAPCO" AND "MACKIE" AR  
MANUFACTURED IN CHINA  
E
REGISTERED  
T
0.315A  
TRADEMARKS OF LOUD TECHNOLOGIES INC.  
COPYRIGHT ©2003  
CHAL  
2
CHL  
1
TO POWER AMPLIFIER OR  
POWERED SPEAKERS INPUTS  
Alternate Hookup:  
Individual Channel or Main Inserts  
Mono EQ  
SIDECHAIN  
Mono EQ  
PROCESSORS  
SERIAL/DATE CODE  
AC~120V/60Hz  
AC FUSE  
OUTPUT  
INPUT SIDE AIN  
OUTPUT  
INPUT SIDE HAIN  
TIP  
INPUT  
TIP  
INPUT  
BAL/  
UNBAL  
BAL/  
UNBAL  
RING  
UTPUT  
BAL/  
UNBAL  
BAL/  
UNBAL  
RING  
UTPUT  
SLEEVE OUND  
SLEEVOUND  
WWW.TAPCOGEAR.COM  
BROUGHT TO YOU BY THE GROOVY FOLKS IN WOODINV  
ILLE, WA, USA  
"TAPCO" AND "MACKIE" AR  
MANUFACTURED IN CHINA  
E
REGISTERED  
T
0.315A  
TRADEMARKS OF LOUD TECHNOLOGIES INC.  
COPYRIGHT ©2003  
CHANNEL  
2
CHANNEL  
1
TO CHANNEL OR MAIN INSERT  
TO CHANNEL OR MAIN INSERT  
RETURN  
TO  
MIXING  
CONSOLE  
SEND  
RETURN  
SEND  
8
 
SQ2 Features  
11  
12  
3
4 5  
6
8
10  
GATE  
MPRESONERL 1/LIMITR  
A
GAIN REDUCTION(dB)  
GATE  
COMPRECSHASNONERL 2/LIMITER  
AIR  
30 20 15 10  
6
4
2
1
-
-
0
-
-
0
30  
10  
2.5  
50  
0.5  
30  
10  
2.5  
50  
0.5  
-
-
-
-
+
-
-
-
-
+
6
50  
15  
20  
0
2
5
10  
100  
0.3  
150 0.1  
200 50ms  
1
6
6
50  
15  
20  
0
2
5
10  
100  
0.3  
150 0.1  
200 50ms  
1
6
1
ON  
CH 1  
CH 2  
+
+
10  
1.5  
10  
1.5  
-
-
-
+
-
-
-
+
70  
0
30  
8
1
2
14  
14  
70  
0
30  
8
1
2
14  
14  
BY  
CH  
1
CH  
2
+
-
+
-
+
+
-
+
-
20  
+
OFF  
10  
CLOSE  
THRESHOLD THRESHOLD  
40  
20  
1
LIM 0.1  
3
20  
20  
OFF  
10  
CLOSE  
THRESHOLD THRESHOLD  
40  
20  
1
LIM 0.1  
3
20  
OFF  
FULL  
AUTO  
IN  
AUTO  
IN  
OFF  
FULL  
SQ2  
ms  
sec  
ms  
sec  
dBu  
dBu  
n:1  
dB  
dBu  
dBu  
n:1  
dB  
AUTO  
CHAN  
1
AUTO  
IN/OUT  
CHAN 2  
IN/OUT  
IN/OUT  
IN/OUT  
POWER  
RATIO  
ATTACK  
RELEASE  
OUTPUT  
LEVEL  
RATIO  
ATTACK  
RELEASE  
OUTPUT  
LEVEL  
2
7
9
FRONT PANEL FEATURES  
5. ATTACK  
The controls for Channels 1 and 2 are the same, so  
these descriptions apply to both channels.  
This control determines how fast the compressor  
reacts once the threshold has been exceeded. It  
ranges from 0.1 ms (milliseconds) to 200 ms.  
GATE  
If you want to use the compressor as a limiter, set  
1. THRESHOLD  
the ATTACK knob to its lowest setting (0.1 ms). This way  
the limiter quickly catches the fast transients before  
they can clip the signal.  
Otherwise, set the ATTACK knob to a somewhat  
higher setting to avoid the pumpingeffect you  
sometimes hear when a compressor is triggered on  
and off frequently.  
Use this control to set the point where the gate  
begins to attenuate the signal. It ranges from OFF (no  
gating action) to +10 dBu.  
When the signal drops below the level indicated by  
the knob setting, the gate closesand the adaptive  
gain reduction of the downward expander kicks in.  
2. CLOSE LED  
6. RELEASE  
This LED lights when the signal drops below the  
threshold and the gate closes.It indicates that the  
gate is working.  
This determines how fast the compressor turns off  
once the signal falls below the threshold. It ranges  
from 50 ms to 3 seconds.  
Again, set the RELEASE knob to its lowest setting (50 ms)  
when using the compressor as a limiter. Otherwise, setting  
the RELEASE knob to a higher setting helps smooth out  
the compressors action, making it less audible.  
COMPRESSOR/LIMITER  
3. THRESHOLD  
This control is used to set the point where the  
compressor begins to attenuate the signal. It ranges  
from 40 to +20 dBu.  
As the input level increases, the output level  
increases linearly until the threshold point is reached.  
When the signal rises above the level indicated by  
the THRESHOLD knob setting, the compressor begins  
to act on the signal and the output level no longer  
increases linearly. Instead it increases at a reduced  
rate determined by the ratio setting.  
7. AUTO IN/OUT  
Push this switch in to bypass the ATTACK and RELEASE  
controls and let the SQ2 automatically determine  
the optimum settings, depending on the type of signal  
present. When the AUTO button is pushed in, the AUTO  
LED below the GAIN REDUCTION Meters lights.  
8. OUTPUT  
This control provides make-up gainfor the  
compressed signal. It ranges from 20 to +20 dB. Use  
this control to compensate for the loss of gain caused  
by the action of the compressor.  
For example, if you are seeing an average gain  
reduction on the meter of about 6 dB, turn the OUTPUT  
control up to +6 dB to make up for it.  
4. RATIO  
The RATIO control determines the change in output  
level as a function of the change in input level, once  
the threshold has been crossed. It ranges from 1:1 (off)  
to LIM (full compression), where the compressor acts  
as a peak limiter and the signal stops increasing once  
it crosses the threshold.  
9. CHAN IN/OUT  
As an example of how the compressor works, if the  
RATIO is set to 2 (2:1), an increase in the input level  
of 10 dB results in a 5 dB increase in the output level  
(assuming the input signal is above the threshold level).  
This is a bypassswitch that effectively disables the  
gate and compressor circuits. You can use this switch  
to compare the processed signal to the unprocessed  
signal. When the CHAN IN/OUT button is pushed in,  
the IN LED below the GAIN REDUCTION Meters lights.  
9
 
10  
11  
12  
3
4 5  
6
8
GATE  
MPRESONERL 1/LIMITR  
AIR  
GAIN REDUCTION(dB)  
GATE  
COMPRECSHASNONERL 2/LIMITER  
AIR  
30 20 15 10  
6
4
2
1
-
-
0
-
-
0
30  
10  
2.5  
50  
0.5  
30  
10  
2.5  
50  
0.5  
-
-
-
-
+
-
-
-
-
+
6
50  
15  
20  
0
2
5
10  
100  
0.3  
150 0.1  
200 50ms  
1
6
6
50  
15  
20  
0
2
5
10  
100  
0.3  
150 0.1  
200 50ms  
1
6
1
ON  
CH 1  
CH 2  
+
+
10  
1.5  
10  
1.5  
-
-
-
+
-
-
-
+
70  
0
30  
8
1
2
14  
14  
70  
0
30  
8
1
2
14  
14  
BY  
CH  
1
CH  
2
+
-
+
20  
-
+
+
-
+
-
20  
+
OFF  
10  
CLOSE  
THRESHOLD THRESHOLD  
40  
1
LIM 0.1  
3
20  
20  
OFF  
10  
CLOSE  
THRESHOLD THRESHOLD  
40  
20  
1
LIM 0.1  
3
20  
OFF  
FULL  
AUTO  
IN  
AUTO  
IN  
OFF  
FULL  
SQ2  
ms  
sec  
ms  
sec  
dBu  
dBu  
n:1  
dB  
dBu  
dBu  
n:1  
dB  
AUTO  
CHAN  
1
AUTO  
IN/OUT  
CHAN 2  
IN/OUT  
IN/OUT  
IN/OUT  
POWER  
RATIO  
ATTACK  
RELEASE  
OUTPUT  
LEVEL  
RATIO  
ATTACK  
RELEASE  
OUTPUT  
LEVEL  
2
7
9
When the signal is below the threshold and there  
AIR Filter  
is no compression taking place, there is no meter  
indication. As soon as the signal crosses the threshold  
and triggers the compressor, the meter LEDs begin  
to light from right to left, indicating more and more  
compression.  
10. LEVEL  
The AIR lter is a unique feature that restores  
brilliance and sizzle to compressed signals. It provides  
a high-frequency boost to the signal after the  
compression stage. It ranges from OFF to FULL, where  
FULL provides the maximum high-frequency boost.  
Certain instruments such as  
12. POWER Switch  
Use this switch to turn the SQ2 on and off. The LED  
above the switch lights when the power is on.  
LOOK  
vocals, acoustic guitars, and brass  
instruments have a wide dynamic  
range. A musician uses this dynamic  
range to accentuate the feel”  
REAR PANEL FEATURES  
CLOSER  
of a particular section in a song.  
Compression is the key to balancing these dynamic  
signals in a live sound system so they dont jump out  
in the mix during hard hitting sections or get lost in the  
softer passages.  
Unfortunately, compression also tends to dull an  
instruments sound, and the sound, although more  
balanced, loses its sparkle.  
13. Line Cord Socket and Fuse  
Here is where you connect the detachable line  
cord that came in the box with your SQ2. Plug  
the other end of the line cord into an AC outlet  
properly congured with the voltage required for your  
particular model (see AC Select Switch next).  
The fuse is located behind the fuse cover, at the  
bottom of the IEC socket. See the Troubleshooting”  
section on page 12 for information about replacing  
the fuse.  
The AIR lter is a high-frequency shelving lter  
whose amplitude varies depending on the amount  
of compression applied to the signal. When softly  
compressing the signal, the AIR lter provides very little  
high-frequency boost (its not really needed). When  
squeezing the signal hard with compression, the AIR  
lter has more high-frequency boost available.  
This makes the AIR lter a great tool for live sound.  
Experiment with the AIR LEVEL control to nd the best  
sound for the particular instrument or voice being  
compressed.  
14. AC Select Switch  
Set this switch to the correct voltage setting for the  
country you are in, 115 VAC or 230 VAC.  
Note: The SQ2 is shipped with the AC Select  
switch set to the 230 VAC position. If you are in a  
country that uses 100-120 VAC, remove the cover  
plate with a phillips-head screwdriver and set the  
switch to the 115 VAC position. A 315 mA fuse  
is used for both voltages (115V/230V). See the  
Troubleshootingsection on page 12 for instructions  
on replacing the fuse.  
11. GAIN REDUCTION Meters  
These 8-segment meters indicate the amount  
of gain reduction that is applied to the signal by  
the compressor. It ranges from 1 to 30 dB of gain  
reduction.  
14  
13  
15  
16  
17  
SERIAL/DATE CODE  
AC~120
AC FUSE  
OUTPUT  
INPUT SIDE CHAIN  
OUTPUT  
INPUT SIDE CHAIN  
=
=
=
=
TIP  
INPUT  
OUTPUT  
TIP  
INPUT  
BAL/  
UNBAL  
BAL/  
UNBAL  
RING  
BAL/  
UNBAL  
BAL/  
UNBAL  
RING  
OUTPUT  
=
=
SLEEVE GROUND  
SLEEVE GROUND  
WWW.TAPCOGEAR.COM  
BROUGHT TO YOU BY THE GROOVY FOL  
KS IN WOODINVILLE, WA, USA  
"TAPCO" AND "MACKIE" ARE REGISTERE  
D
T 0.315A  
TRADEMARKS OF LOUD TECHNOLOGIES  
INC.  
COPYRIGHT ©2003  
CHANNEL 2  
CHANNEL 1  
10  
 
15. OUTPUT  
GENERAL PRECAUTIONS AND  
CONSIDERATIONS  
Two types of connectors are provided for the  
outputs male XLR and 1/4TRS (Tip-Ring-Sleeve).  
These balanced outputs are in parallel, and provide  
exactly the same signal.  
Rack Mounting  
The SQ2 is designed to be mounted in a  
standard rack. It requires only a single rack space  
(1U = 1.75). It also requires 7.5depth inside the  
rack, not counting the front knobs or rear connectors.  
When designing your rack, put the heavier items at  
the bottom and the lighter items toward the top.  
Secure the front panel of the SQ2 to the front of  
the rack using four screws with soft washers to prevent  
scratching the panel.  
You can connect either a balanced TRS connector  
or an unbalanced TS connector to the 1/4output  
jack. See Appendix B: Connectionson page 14 for  
information on output connection wiring.  
16. INPUT  
Two types of connectors are provided for the inputs  
female XLR and 1/4TRS (Tip-Ring-Sleeve). These  
balanced inputs are in parallel, so do not connect  
more than one signal at a time to the input jacks for  
each channel.  
You can connect either a balanced or an unbalanced  
signal to the 1/4input jack. A servo-circuit detects when  
there is an unbalanced signal and automatically adjusts  
the input level by 6 dB to compensate for the lower  
level. See Appendix B: Connectorson page 14 for  
information on output connection wiring.  
Thermal Considerations  
Avoid mounting the SQ2 directly over devices  
that produce heat, such as power ampliers. As with  
all electronic components, it is best to provide cool  
air circulation around the SQ2 to avoid overheating.  
The ambient temperature should not exceed 113˚ F  
(45˚ C).  
AC Power Considerations  
Be sure the SQ2 is plugged into an AC outlet that  
is able to supply the specied voltage, and the AC  
Select switch is set to the correct voltage.  
Be sure the AC outlet can supply enough current  
to allow full power operation of all the components  
plugged into it, especially if there are power ampliers  
plugged in. The outlet should be a three-prong socket  
that matches the power cord.  
17. SIDE CHAIN  
This 1/4TRS connector serves as an insert point  
to control the compressor. When a 1/4TRS plug is  
connected to the SIDE CHAIN jack, the tip sends out  
a pre-compressor version of the signal, which can  
be passed through a processor like an equalizer or  
de-esser, and then returned via the ring of the plug.  
Special InsertY-cords are available for this type of  
Send/Return insert jack.  
Its important to note that the signal at the SIDE  
CHAIN SEND (Tip) is not the actual signal passing  
through the compressor, but a buffered duplicate of  
the signal that can be processed externally to tailor  
the control signal.  
WARNING: Bypassing the plugs  
safety ground pin can be  
dangerous. Dont do it!  
Here are some examples of common ways to use  
the SIDE CHAIN connection:  
Frequency-dependent compression: Connect the  
SIDE CHAIN SEND to the input of a graphic equalizer,  
and the output of the equalizer to the SIDE CHAIN  
RETURN. Boost the low frequencies with the graphic  
equalizer to trigger the compressor off the bass drum.  
Time-shifted compression: Split the audio signal  
prior to the SQ2 and route one signal directly  
to the SIDE CHAIN RETURN (no connection to the  
SIDE CHAIN SEND). Route the other signal through  
a delay processor and then to the SQ2 input. By  
experimenting with the delay time, the compressor  
can anticipate the signal at its input and trigger the  
compression slightly ahead of the actual peaks.  
Ducking: Use a microphone to trigger the  
compressor and reduce the level of the audio signal  
while an announcement is being made over a PA  
system. Connect the microphone signal to the SIDE  
CHAIN RETURN (no connection to the SIDE CHAIN SEND).  
11  
 
Appendix A: Service Information  
No Sound  
Warranty Service  
Is the GATE THRESHOLD control turned up too high?  
Details concerning Warranty Service are spelled  
out in the Warranty section on page 19.  
Turn the GATE THRESHOLD all the way OFF and see  
if you hear anything.  
If you think your SQ2 has a problem, please do  
everything you can to conrm it before calling for  
service. Doing so might save you from the deprivation  
of your compressor and the associated suffering.  
These may sound obvious to you, but here are  
some things you can check. Read on.  
Is the signal source turned up? Make sure the  
signal level from the mixing console (or whatever  
device immediately precedes the SQ2) is high  
enough to produce sound through the system.  
Are you using the SQ2 with an insert plug in an  
insert jack? Make sure that you are using an insert  
cable, and not a mono Y-cable.  
Troubleshooting  
No Power  
Poor sound  
Our favorite question: Is it plugged in? Make sure  
the AC outlet is live (check with a tester or lamp).  
Is it loud and distorted? Turn down the signal  
coming from the mixer or signal source.  
Our next favorite question: Is the POWER switch  
on? If not, try turning it on.  
Is the input connector plugged completely into  
the jack? Make sure all connections are good and  
sound.  
Is the red LED above to the POWER switch  
illuminated? If not, make sure the AC outlet is live.  
If so, refer to No Soundbelow.  
Switch the CHAN IN/OUT switch in and out to  
compare the sound with the compressor in the  
signal path and out of the signal path. This can  
help determine if the problem is with the SQ2 or  
elsewhere in the system.  
Is the fuse blown? If the POWER LED on the front  
panel is not illuminated and you are certain that  
the AC outlet is live, if is possible the fuse has blown.  
To remove and replace the fuse:  
Noise/Hum  
1. Disconnect the line cord from the IEC socket.  
Check the signal cable between the mixer and  
the SQ2. Make sure all connections are good and  
sound.  
2. Remove the fuse drawer by prying it open with a  
small screwdriver. It will slide all the way out.  
Make sure the signal cable is not routed near AC  
cables, power transformers, or other EMI-inducing  
devices.  
Is there a light dimmer or other SCR-based device  
on the same AC circuit as the SQ2? Use an AC  
line lter, or plug the SQ2 into a different AC  
circuit.  
FUSE  
3. Remove the fuse and replace it with an  
equivalent-type fuse:  
315 milliamp slo-blo (T315 A/250 V)  
Note: The same fuse is used for both 115 VAC and  
230 VAC operation.  
4. Replace the fuse drawer by pushing it all the way  
back into the IEC socket.  
5. Reconnect the line cord and turn the POWER  
switch on.  
If two fuses blow in a row, then something is wrong.  
See the Repairsection on the next page to nd  
out what to do.  
12  
 
Repair  
Service for TAPCO products is available from one  
of our authorized domestic service centers or at our  
factory, located in sunny Woodinville, Washington.  
Service for TAPCO products living outside the United  
States can be obtained through local dealers or  
distributors.  
6. Write the RA number in BIG PRINT on top of the box.  
Units sent to us without the RA number will be refused.  
7. Ship the SQ2 to us. We suggest insurance for all  
forms of cartage. Ship to this address:  
TAPCO  
If your SQ2 needs service, follow these instructions:  
1. Review the preceding troubleshooting suggestions.  
Please.  
SERVICE DEPARTMENT  
16220 Wood-Red Road NE  
Woodinville, WA 98072  
2. Call Tech Support at 1-877-827-2669, 7 am to 5 pm  
PST, to explain the problem and request an RA  
(Return Authorization) number. Have your SQ2s  
serial number ready. You must have an RA number  
before you can obtain warranty service at the  
factory or an authorized service center.  
8. Well try to x the SQ2 within ve business days.  
Ask Tech Support for the latest turn-around times  
when you call for your RA number. The SQ2  
must be packaged in its original packing box,  
and must have the RA number on the box. Once  
its repaired, well ship it back the same way in  
which it was received. This paragraph does not  
necessarily apply to non-warranty repair.  
3. Keep this owners manual and the detachable line  
cord. We dont need them to repair the SQ2.  
4. Pack the SQ2 in its original package, including  
endcaps and box. This is very important. When  
you call for the RA number, please let Tech  
Support know if you need new packaging. You  
can order new packaging through our parts  
department. LOUD Technologies is not responsible  
for any damage that occurs due to non-factory  
packaging.  
5. Include a legible note stating your name, shipping  
address (no P.O. boxes), daytime phone number,  
RA number, and a detailed description of the  
problem, including how we can duplicate it.  
Lonely? Looking for that special someone? Do you have a question about  
your TAPCO product?  
Please call our Technical Support folks at 1-877-827-2669, Monday to Friday, from 7 am to 5 pm PST.  
13  
 
Appendix B: Connections  
XLR Connectors  
1/4" TS Phone Plugs and Jacks  
TSstands for Tip-Sleeve, the two connection  
points available on a mono 1/4" phone jack or plug.  
They are used for unbalanced signals.  
The inputs and outputs use 3-pin male and female  
XLR connectors. They are wired as follows, according  
to standards specied by the AES (Audio Engineering  
Society).  
SLEEVE  
SLEEVE  
TIP  
2
SHIELD  
HOT  
TIP  
TIP  
1
3
COLD  
SLEEVE  
1/4" TS Unbalanced Wiring:  
Sleeve = Shield  
Tip = Hot (+)  
SHIELD  
COLD  
HOT  
1
3
2
XLR Balanced Wiring  
Pin 1 = Shield  
1/4" TRS Insert Plugs and Jacks  
The SIDE CHAIN connectors on the SQ2 are special  
1/4" TRS insert cables that use the tip to send the signal  
outside the box, and the ring to return the signal to  
the box. The sleeve is the common ground (earth) for  
both signals. These are both unbalanced signals.  
Note: This insert cable is also used with a mixers  
insert jack.  
Pin 2 = Hot (+)  
Pin 3 = Cold ()  
1/4" TRS Phone Plugs and Jacks  
TRSstands for Tip-Ring-Sleeve, the three  
connection points available on a stereo 1/4" or  
balanced phone jack or plug. TRS jacks and plugs are  
used for balanced signals.  
SEND to processor  
ring  
“tip”  
(TRS plug)  
tip  
sleeve  
RING SLEEVE  
SLEEVE RING TIP  
This plug connects to the  
SQ•2’s SIDE CHAIN Insert jack.  
TIP  
“ring”  
RETURN from processor  
RING  
TIP  
1/4" TRS Insert Wiring:  
Sleeve = Ground  
Tip = Send  
SLEEVE  
1/4" TRS Balanced Wiring:  
Sleeve = Shield  
Tip = Hot (+)  
Ring = Return  
Ring = Cold ()  
14  
 
Appendix C: Technical Info  
SQ2 Specications  
Frequency Response  
AC Power and Current Requirements  
Power Consumption: 12.5 watts  
AC Operating Voltages:  
20 Hz to 20 kHz (+0, 1 dB)  
U.S.  
120 VAC, 60 Hz  
240 VAC, 50 Hz  
100 VAC, 50/60 Hz  
220 VAC, 60 Hz  
315 mA @ 100-240 VAC  
Audio Input  
Europe  
Japan  
Korea  
Type:  
Active balanced XLR  
and 1/4" jacks  
60 kbalanced  
Impedance:  
Maximum Input Level: +21 dBu balanced and  
unbalanced  
Fuse:  
Physical Dimensions and Weight  
Height:  
Width:  
Depth:  
Weight:  
1.75 in/44 mm  
19.0 in/483 mm  
8.5 in/216 mm  
6.6 lb/3.0 kg  
Audio Output  
Type:  
Impedance:  
Maximum Output Level:  
THD+N @ 1 kHz, +4 dBu:  
SMPTE IMD, +4 dBu:  
XLR and 1/4" jacks  
<40 kunbalanced  
+21 dBu  
0.05% typical  
0.01%  
Disclaimer  
Since we are always striving to make our products  
better by incorporating new and improved materials,  
components, and manufacturing methods, we  
reserve the right to change these specications at  
any time without notice.  
Noise and Hum, unity gain:  
Noise and Hum, fully off:  
Crosstalk @ 20 kHz:  
< 93 dBu  
< 97 dBu  
< 85 dBu  
> 60 dB  
Common Mode Rejection:  
Compressor  
Type:  
Auto soft knee/hard knee  
40 dBu to +20 dBu  
1:1 to LIM  
Threshold:  
Ratio:  
Attack:  
Release:  
Output:  
0.1 ms to 200 ms  
50 ms to 3 sec  
20 dB to +20 dB  
Gate  
Type:  
Soft gate with expander  
OFF to +10 dBu  
Threshold:  
AIR Filter  
Type:  
Dynamically controlled  
frequency correction  
Variable from Off to Full  
Process:  
Switches  
CHAN IN/OUT  
AUTO  
Bypass switch  
Program dependent attack  
and release times  
Indicators  
CLOSE LED for Expander/Gate  
AUTO LED for Auto Attack/Release  
Channel IN LED for CHAN IN/OUT Status  
8-segment green LED Gain Reduction Meter  
POWER ON LED  
15  
 
SQ2 Block Diagram  
This outlines the signal ow inside the SQ2.  
16  
 
115V  
17  
 
by  
18  
 
TAPCO LIMITED WARRANTY  
G. LOUD Technologies warrants all repairs performed  
A. LOUD Technologies Inc. warrants all materials,  
workmanship and proper operation of this TAPCO  
product for a period of one year from the original  
date of purchase. If any defects are found in the  
materials or workmanship, or if the product fails to  
function properly during the applicable warranty  
period, LOUD Technologies, at its option, will repair  
or replace the product. This warranty applies only  
to equipment sold and delivered within the U.S. by  
LOUD Technologies or its authorized dealers.  
for 90 days or for the remainder of the warranty  
period. This warranty does not extend to damage  
resulting from improper installation, misuse,  
neglect or abuse, or to exterior appearance. This  
warranty is recognized only if the inspection seals  
and serial number on the unit have not been  
defaced or removed.  
H. LOUD Technologies assumes no responsibility for  
the quality or timeliness of repairs performed by  
TAPCO Authorized Service Centers.  
B. Failure to register online or return the product  
registration card will not void the 1-year warranty.  
I. This warranty is extended to the original purchaser  
and to anyone who may subsequently purchase  
this product within the applicable warranty period.  
C. Service and repairs of TAPCO products are to be  
performed only at the factory, OR at a factory-  
authorized service center. Unauthorized service,  
repairs, or modication will void this warranty.  
J. This is your sole warranty. LOUD Technologies Inc.  
does not authorize any third party, including any  
dealer or sales representative, to assume any  
liability on behalf of LOUD Technologies or to make  
any warranty for LOUD Technologies Inc.  
D. To obtain service, please follow the instructions  
found on page 13.  
E. LOUD Technologies Inc. and Authorized TAPCO  
Service Centers reserve the right to inspect any  
products that may be the subject of any warranty  
claims before repair or replacement is carried  
out. LOUD Technologies and Authorized TAPCO  
Service Centers may, at their option, require  
proof of the original date of purchase in the form  
of a dated copy of the original dealers invoice  
or sales receipt. Final determination of warranty  
coverage lies solely with LOUD Technologies Inc. or  
its Authorized Service Centers.  
K. THE WARRANTY GIVEN ON THIS PAGE IS THE SOLE  
WARRANTY GIVEN BY LOUD TECHNOLOGIES INC.  
AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS  
AND IMPLIED, INCLUDING THE WARRANTIES OF  
MERCHANTABILITY AND FITNESS FOR A PARTICULAR  
PURPOSE. THE WARRANTY GIVEN ON THIS PAGE  
SHALL BE STRICTLY LIMITED IN DURATION TO ONE  
YEAR FROM THE DATE OF ORIGINAL PURCHASE  
FROM AN AUTHORIZED TAPCO DEALER. UPON  
EXPIRATION OF THE APPLICABLE WARRANTY PERIOD,  
LOUD TECHNOLOGIES SHALL HAVE NO FURTHER  
WARRANTY OBLIGATION OF ANY KIND. LOUD  
TECHNOLOGIES INC. SHALL NOT BE LIABLE FOR  
ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL  
DAMAGES THAT MAY RESULT FROM ANY DEFECT IN  
THE TAPCO PRODUCT OR ANY WARRANTY CLAIM.  
Some states do not allow exclusion or limitation of  
incidental, special, or consequential damages or  
a limitation on how long warranties last, so some  
of the above limitations and exclusions may not  
apply to you. This warranty provides specic legal  
rights and you may have other rights which vary  
from state to state.  
F. TAPCO products returned to LOUD Technologies  
and deemed eligible for repair or replacement  
under the terms of this warranty will be repaired  
or replaced within thirty days of receipt by LOUD  
Technologies at our rainforest factory complex.  
LOUD Technologies may use refurbished parts for  
repair or replacement of any product. Products  
returned to LOUD Technologies that do not meet  
the terms of this Warranty will be repaired and  
returned C.O.D. with billing for labor, materials,  
return freight, and insurance. Products repaired  
under warranty at the factory will be returned  
freight prepaid by LOUD Technologies to any  
location within the boundaries of the USA.  
Please keep your sales receipt in a safe place.  
Mackie.and TAPCOare registered trademarks of  
LOUD Technologies Inc. Squeezis a trademark of  
LOUD Technologies Inc.  
All other brand names mentioned are trademarks or  
registered trademarks of their respective holders, and  
are hereby acknowledged.  
©2004 LOUD Technologies Inc. All Rights Reserved.  
19  
 

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