Topp Music Gear TCL Series, User Manual

5. Threshold Control 

This control adjusts the threshold level for the Compressor section in the range of -40dBu to +20dBu. The SKC 
(Smart Knee Control) is applied to the audio signal, which is a maximum of 10dB above the set threshold. 
Above such level (10dB) a hard knee compression will be applied.

6. Threshold LED 

These LED's will show you the state of the input signal in relation to the threshold level. If the input signal 
falls below the set threshold level the left "-" LED will light up. This means that no signal is being compressed. 
If the input signal rises above the set threshold level, this signal will be compressed and the SKC level will be 

 shown by the middle "0" LED.

7. Ratio Control 

The ratio between the input and output level of audio signals exceeding the set threshold level is determined by 

 this control. This control is manually adjustable from 1:1 to  :1.

8. Attack Control 

This control determines how fast the compressor is to respond to audio signals that will exceed the set threshold.
It can be manually adjusted from 1 to 150 ms.

9. Release Control 

This control determines how fast is the compressor to return to unity gain when the audio signal falls below the 
set threshold level. It can be manually adjusted from 0.05 to 5 seconds.

10.Auto Switch 

Who needs attack and release control? Activate this switch and these controls will be deactivated. Attack and 
release controls will be automatically set by the unit depending on the program material.

Pic. 3 Controls of the Compressor Section

5

6

7

8

9

10

12

13

14

15

16

17

18

19

11

2. Threshold Control 

This control adjusts the threshold level for the Expander / Gate Section in the range of Off to +15dBu. Signals 
below this level cause expansion.

3. Ratio Control 

This control determines the expansion ratio when the signal drops below the threshold level. The expansion 
ratio can be set from 1:1.2 to 1:8 (Low ratio for Expander application or 1:8 for Gate application). 

4. Threshold LED 

The "+" Led lights up when an audio signal is below the set threshold. The "-" Led lights up in presence of an

 expansion

    Compressor Section 

MANUAL
AUTO

SC MONITOR

SC EXTERANL

dBu

-10

-30

+20

+10

-40

0

THRESHOLD

30 27 24 21 18 15 12 9 6 4 2

GAIN REDUCTION(dB)

4

10

1

2

N:1

RATIO

THRESHOLD

dB/mSec

30

6

110

70

15

1

150

ATTACK

dB/Sec

0.5

3

1.5

0.3

5

0.1

0.05

RELEASE

SC FILTER

I/O METER

BYPASS
COMP

dB

0

-10

OUTPUT GAIN

  CH2

INPUT / OUTPUT LEVEL(dB)

-24 -18 -12 -6 0

6 12

SMART

+10

+20

1

18

COMPRESSOR

7