andmiddot Dual channel 15 band EQ with up to - 12dB adjustment per band.andmiddot Adjustment of up to 23 octave per channelandmiddot 2 switchable equalizing ranges -6dB and -12dB This compact 1U Equaliser gives total control of your sound. 15 23 octave bands on each channel allow individual fine adjustment of left and right channels for stereo operation.