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10
AIR Filter
10. LEVEL
The AIR fi 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
vocals, acoustic guitars, and brass
instruments have a wide dynamic
range. A musician uses this dynamic
range to accentuate the “feel”
of a particular section in a song.
Compression is the key to balancing these dynamic
signals in a live sound system so they don’t jump out
in the mix during hard hitting sections or get lost in the
softer passages.
Unfortunately, compression also tends to dull an
instrument’s sound, and the sound, although more
balanced, loses its sparkle.
The AIR fi lter is a high-frequency shelving fi lter
whose amplitude varies depending on the amount
of compression applied to the signal. When softly
compressing the signal, the AIR fi lter provides very little
high-frequency boost (it’s not really needed). When
squeezing the signal hard with compression, the AIR
fi lter has more high-frequency boost available.
This makes the AIR fi lter a great tool for live sound.
Experiment with the AIR LEVEL control to fi nd the best
sound for the particular instrument or voice being
compressed.
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.
When the signal is below the threshold and there
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.
12. POWER Switch
Use this switch to turn the SQ•2 on and off. The LED
above the switch lights when the power is on.
REAR PANEL FEATURES
13. Line Cord Socket and Fuse
Here is where you connect the detachable line
cord that came in the box with your SQ•2. Plug
the other end of the line cord into an AC outlet
properly confi gured 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.
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 SQ•2 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
“Troubleshooting” section on page 12 for instructions
on replacing the fuse.
LOOK
CLOSER
BY
BY
SQ•2
POWER
ON
THRESHOLD
CLOSE
RATIOTHRESHOLD ATTACK RELEASE
AUTO
IN/OUT
OUTPUT LEVEL
CHAN 1
IN/OUT
CHANNEL 1 CHANNEL 2
THRESHOLD
CLOSE
RATIOTHRESHOLD ATTACK RELEASE
AUTO
IN/OUT
OUTPUT LEVEL
CHAN 2
IN/OUT
GATE COMPRESSOR / LIMITER COMPRESSOR / LIMITER
OFF
+
10
0
dBu
-
70
-
50
-
30
-
15
-
40
+
20
+
10
-
30
-
20
-
10
0
1 LIM
81
1.5
2
2.5
5
0.1 200
150
10
50
100
50ms 3
20.1
0.3
0.5
1
dBu n:1
ms sec
-
20
+
20
+
14
-
14
-
6
0
+
6
dB
GAIN REDUCTION(dB)
30
CH 1
CH 2
AUTO
CH 1 CH 2
IN AUTO IN
20 15 10 6 4 2 1
-
70
GATE
OFF
+
10
0
dBu
-
50
-
30
-
15
-
40
+
20
+
10
-
30
-
20
-
10
0
1 LIM
81
1.5
2
2.5
5
0.1 200
150
10
50
100
dBu n:1
ms
50ms 3
20.1
0.3
0.5
1
-
20
+
20
+
14
-
14
-
6
0
+
6
sec
dB
AIR
OFF FULL
AIR
OFF FULL
6
7
8
9
10
1
4
5
3
2
11
12
AC FUSE
T 0.315A
AC~120V/60Hz
SERIAL / DATE CODE
TIP
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=
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SLEEVE
=
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OUTPUT
BAL/
UNBAL
BAL/
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