Frequency Characteristics; Hpf; Lpf (Mono); Channel Equalizer Characteristics - Yamaha MG32/14FX Service Manual

4.3 Frequency Characteristics

In the signal routes of the Table 4.2-1 to 4.2-12 indicated with (#), the 20Hz and 20kHz frequency response of each
output shall be within the range of 0 dB +1/-2.5 dB compared to the 1kHz (0dB). When indicated with (##) [TB MIC
IN],163Hz (instead of 20Hz) frequency response shall be within the range of -3 +/-2 dB.
The 20Hz level when the GAIN volume is Max shall be within the range of 0 dB +1.0/-4.5 dB compared to the 1kHz
(0dB).
The 20Hz level at PHONES when the Gain volume is maximum shall be within the range of 0dB +1.0/-4.5dB
compared to the 1kHz (0dB).
The 20Hz level at PHONES when the Gain volume is maximum shall be within the range of 0dB +0/-3.5dB
compared to the 1kHz (0dB).
In the route of table 4.2-1 and 4.2-2, check every OUT when the signal is fed to CH1, and check only the ST L OUT
when the signal is fed to CH2 and other channels.

4.4 HPF

In the state of the Table 4.2-1, feeding 80 Hz -36dBu signal, and setting the GAIN to MIN, the STEREO L OUT level
obtained when the 80 switch is set to ON shall be within the range of -3 +/-2 dB compared to the level obtained when the
switch is set to OFF.

4.5 LPF (MONO)

In the state of the Table 4.2-2, set the LPF (MONO) switch to ON. When the LPF (MONO) frequency control set to MIN
(80Hz) and feed 90Hz signal, the MONO OUT output level shall be within the range of -3 +/-2dB compared to the level
obtained when the switch is set to OFF. The same is said of setting frequency control to MAX (120Hz) and feeding 145Hz
signal. Measure only CH1.

4.6 Channel Equalizer Characteristics

In the state checked in 4.1 above, check the output level obtained at GROUP1 OUT in the case of CH INPUT and ST CH
INPUT L and at GROUP2 OUT in the case of ST CH INPUT R when LO, HI and MID of INPUT are moved respectively.
Its level of each frequency shall be within the range specified in the table 4.6-1~2 compared to the output level obtained
when the EQ level control is center click position. If it is without the range, search the frequency, within the range of +/-
20%, of that the level is within the range of Table 4.6-1~2.
Table 4.6-1 CH1-16/24 [dBu]
EQ Level control
MAX
HIGH
MIN
MAX
MIN
MID
MAX
MIN
MAX
LOW
MIN
Table 4.6-2 ST CH17-24/25-32 [dBu]
EQ Level control
MAX
HIGH
MIN
MAX
HI-MID
MIN
MAX
LO-MID
MIN
MAX
LOW
MIN
f control Applied frequency
–
10kHz
–
MAX 5kHz
MIN 250Hz
–
100Hz
–
Applied frequency Variation width
+12 ± 2
10kHz
-12 ± 2
+15 ± 2.5
3kHz
-15 ± 2.5
+15 ± 2.5
800Hz
-15 ± 2.5
+12 ± 2
100Hz
-12 ± 2
Variation width
+12 ± 2
-12 ± 2
+15 ± 2.5
-15 ± 2.5
+15 ± 2.5
-15 ± 2.5
+12 ± 2
-12 ± 2
MG24/14FX
MG32/14FX
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