A lot of instruments such as microphones, amplifiers, guitar pickups, etc generate some noise, either at low
Pic. 1 Front Panel of The ACL2 PRO
When engaged, the Master channel (channel 1) will take control of both channels and override all the controls
and switches of channel 2 with the exception of the SC Monitor, SC External, SC Filter and Bypass switches as
well as the Peak Limiter control.
Expander/Gate Section
3
1
Pic. 2 Controls of Expander /Gate section
23
4
frequencies (hum) or at high frequencies (hiss) such noise will inevitably interfere with the quality of your
audio signal. Now, if you scream into a microphone you will not hear the noise generated by such micro-
phone because such noise will be "masked" by the higher level of the signal, your voice in this case.
But if you sing into your microphone more gently in a soft passage, the level of the signal generated by your
voice will get much closer to the floor noise level and such floor noise will become disturbing. In order to kill
this problem Expanders and noise-gates are used. An expander is the opposite of a compressor: attenuating
the signal when the amplitude drops they can limit the floor noise.
Now, we do not need dramatic expansion of a signal across the range, This would generate a resulting dy-
namic range of over 150dB. For this reason the amplitude control will be applied only to those audio signals
which are below a set threshold. Those audio signals above the set threshold will not be affected. Noise-
gate can be regarded as a simple Expander. But the Expander will attenuate the audio signal continuously
below the set threshold while the noise-gate will simply dramatically cut-off the audio signal completely.
Voltage Controlled Amplifier (VCA)
The VCA is the soul of the TCL-2 and it is one of the best components available today in his category thanks
to its excellent performances in terms of distortion, linearity, noise and temperature stability.
Inputs
Take it easy: Balanced Inputs
To make your life easy and clean we have provided TCL-2 with electronically balanced inputs. Even if
you operate at high signal levels, hum and noise will be reduce automatically. There is also a servo-function
that will automatically adjust the internal level when unbalanced connectors are detected. The correction
if of 6dB and it will avoid differences in level in between input and output signal.
Your TCL-2 presents with right and left channels. Each channel is equipped with the same control elements: 7 push-
button switches, 8 rotary controls and 26 LEDs. You can easily operate the stereo mode via pressing the Couple switch.
The details please refer to following content.
1. Couple Switch
Pressing this push-button for stereo mode operation.
1:N
2.5
7
8
1.2
RATIO
dBu
OFF
-60
+15
THRESHOLD
0
-35
1.5
EXPANDER / GATE
POWER
DUAL MONO
CH 1 MASTER
COUPLE
MANUALMANUAL
AUTOAUTO
SC MONITORSC MONITOR
RATIORATIO
SC EXTERANLSC EXTERANL
00
THRESHOLDTHRESHOLD
3030 2727 2424 2121 1818 1515 1212 99664422
GAIN REDUCTION(dB)GAIN REDUCTION(dB)
4
10
1
2
N:1
RATIORATIO THRESHOLDTHRESHOLD
dB/mSec
dB/mSec
30
6
110
7015
1
150
ATTACK
ATTACK RELEASE
RELEASE
SC FILTERSC FILTER I/O METERI/O METER
BYPASSBYPASS
COMPCOMP
dB
0
OUTPUT GAINOUTPUT GAIN
CH2CH1
INPUT / OUTPUT LEVEL(dB)INPUT / OUTPUT LEVEL(dB)
00 66 1212
LIMLIM
THRESHOLDTHRESHOLD
SMARTSMART
+10
+20
11
dBu
OFF
+15
THRESHOLDTHRESHOLD
0
1818
LIMITERLIMITER COMPRESSORCOMPRESSOR EXPANDER / GATEEXPANDER / GATE
60
35
10
20
2424 1818 1212 66
ON
OFF
COMPRESSOR/
LIMITER/GATE
TCL-2
R
1:N
2.5
7
8
1.2
1.5
dBu
+20
+1030
40
10
dB/Sec
0.5
3
1.50.3
5
0.1
0.05
0
dBu
+18
OFF
+12
+4
dBu
OFF
+15
0
60
35
1:N
2.5
7
8
1.2
1.5
dBu
+20
+1030
40
104
10
1
2
N:1
30
6
110
7015
1
150
dB/Sec
0.5
3
1.50.3
5
0.1
0.05
dB
0
+10
+20
10
20 0
dBu
+18
OFF
+12
+4
6
More about noise: Expanders and Noise-Gates
CONTROLS
