7. System Examples (F-121C and F-121CM)
When using the F-121C or F-121CM, an optional
electronic controller AC-120 is required. The AC-120
has internal equalizing filters designed exclusively for
both the F-121C and F-121CM.
System employing no sub-woofer
Note:
Set the AC-120's mode switch to F-120C
position.
System employing a sub-woofer
When using TOA's digital signal processor instead of the AC-120, it is recommended that frequency
characteristics be set as shown in the following tables:
Filter characteristics for F-121C/F-121CM (normal mode)
(Setting for ordinary applications)
Filter
PEQ
HPF
LPF
Frequency
85 Hz
212 Hz
900 Hz
10 kHz
37.5 Hz
37.5 Hz
20 kHz
Gain
+11.5 dB
-2.5 dB
-8 dB
+8 dB
Q
2.871
0.667
2.871
0.267
0.7
0.5
0.7
Filter characteristics for sub-woofer
Filter
PEQ
LPF
Frequency
112 Hz
100 Hz
Gain
+2.5 dB
Q
0.667
0.5
Filter characteristics for F-121C/F-121CM (low-
frequency cut mode)
(Setting for speech applications)
Filter
PEQ
HPF
LPF
Frequency
80 Hz
180 Hz
900 Hz
11.2 kHz
45 Hz
45 Hz
20 kHz
Gain
+6.5 dB
-4.5 dB
-7.5 dB
+8 dB
Q
1.414
0.667
2.871
0.267
0.7
0.5
0.7
TOA Corporation
533-06-046-3A
Mixer/pre-amplifier
Electronic controller
AC-120
Power amplifier
Mixer/pre-amplifier
Electronic controller
AC-120
Power amplifier
F-121C
(F-121CM)
F-121C
(F-121CM)
F-121C
(F-121CM)
F-121C
(F-121CM)
Sub-woofer