Comp; Ratio; Attack Time And Release Time - Yamaha MG 166CX-USB Service Manual

2-17 COMP

2-17-1 GAIN
With controls set as specified in the section 2-2, set the COMP control of channels 1-6 to maximum.
Then check the output level obtained at INSERT OUT 1-6 is within the range specified in the table 2-17-1.
Table 2-17-1
CH INPUT 1-6 INPUT LEVEL
MIC

2-17-2 RATIO

Increase the input level by +10 dB and check the output level obtained at INSERT OUT 1-6 is within the range specified in the
table 2-17-2 compared with the output level specified in the table 2-17-1.
Table 2-17-2
CH INPUT 1-6 INPUT LEVEL
MIC
2-17-3 Frequency Characteristic
With the condition specified in the section 2-17-2, set the signal frequency to 20 Hz and 20 kHz and check the output level
obtained at INSERT OUT 1-6 is within the range of ± 3 dB compared with the 1 kHz (0 dB).
2-17-4 Distortion
With the condition specified in the section 2-17-2, set the signal frequency to 20 Hz, 1 kHz and 20 kHz and check the distortion
is less than the value specified in the table 2-17-4.
Table 2-17-4
Input Frequency
20 Hz
1 kHz
20 kHz
Note:
• Distortion should be measured with a 30 kHz low pass filter.

2-17-5 Attack Time and Release Time

With the condition specified in the section 2-17-2, check the attack time and the release time of the output obtained at INSERT
OUT 1-6 is within the range specified in the table 2-17-5.
Table 2-17-5
Attack Time 15 ms - 35 ms
Release Time 170 ms - 420 ms
Notes:
• Attack time: restoration time (at 90 %) after
changing the input level from -66 dBu to -56
dBu. (Fig. 2-17-5)
• Release time: restoration time (at 90 %) af-
ter changing the input level from -56 dBu
to -66 dBu. (Fig. 2-17-5)
COMP control
-65 dBu Max.
INSERT OUT 1-6
+3.5 ± 1 dBu
-55 dBu
Distortion
5.0 %
1.0 %
1.0 %
INSERT OUT
MG166CX-USB/MG166CX/MG166C-USB/MG166C
INSERT OUT 1-6
+3 ± 2 dBu
ATTACK TIME
Rectangular wave
Sine wave Sine wave
90%
Restoration Time
RELEASE TIME
Restoration Time
90%
100%
Fig. 2-17-5
100%
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