Alesis MultiMix 12R Reference Manual - Page 49

Applications Using the HIGH and LOW EQ controls The Multimix 12R provides standard shelving EQ controls on each channel. The HIGH knob range is +/- 15 dB with a shelving frequency of 12 kHz. "Shelving" means that all frequencies above 12 kHz will be boost or cut by the same amount , and frequency response between 1 kHz and 12 kHz will gradually rise or fall to the shelving point. The LOW knob range is +/- 15 dB at a shelving frequency of 80 Hz. This means that frequencies below 80 Hz will be boosted or cut by the same amount, and frequency response will gradually rise or fall from 80 Hz to about 1 kHz. The frequency response range is shown in the curve below: +15 dB -15 dB 20 Hz 100 Hz 1 kHz 10k 20k ✪ The normal position for the EQ controls is "12 o'clock" or straight up. A "click" or detent will be felt at this position. At this position, the EQ does not affect the frequency response of the channel--it is "flat". Use only the amount of EQ necessary to achieve the desired effect. Excessive boost on either EQ section may cause clipping in the channel electronics, and will amplify noise. Multimix 12R Reference Manual 39