FXAlg #968: Graphic EQ ¥ FXAlg #969: Dual Graphic EQ
Algorithm Reference-174
FXAlg #968: Graphic EQ ¥
FXAlg #969: Dual Graphic EQ
Dual mono 10-band graphic equalizers
Allocation Units:
3
The graphic equalizer is available as stereo (linked parameters for left and right) or dual mono (independent
controls for left and right). The graphic equalizer has ten bandpass filters per channel. For each band the gain may
be adjusted from -12 dB to +24 dB. The frequency response of all the bands is shown in the Figure 1. The dual
graphic equalizer has a separate set of controls for the two mono channels.
Filter Response of Each Bandpass Filter
Like all graphic equalizers, the filter response is not perfectly flat when all gains are set to the same level (except at
0 dB), but rather has ripple from band to band (see Figure 2). To minimize the EQ ripple, you should attempt to
center the overall settings around 0 dB.
Overall Response with All Gains Set to +12 dB, 0 dB and -6 dB
2 0
1 0
0
Amp
(dB)
3 1
6 2
125
250
500
1000
16000
2000 4000 8000
Freq (Hz)
1 0
0
1 0
3 1
6 2
125
250
500
1000
16000
2000 4000 8000
Freq (Hz)
Amp
(dB)
