Alesis 12R manual Using the High and LOW EQ controls

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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

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Contents Reference Manual Page Important Safety Instructions Page Page Page Page Page CE Declaration Of Conformity Front Panel Table of Contents Applications Dimensional DrawingIntroduction Using this manualAlesis Multimix 12R Microphone Preamplifier/Mixer ConventionsGrounding Instructions AC power InstallationUnpacking Power switch Use clean powerMounting Inputs ConnectionsCable common sense Microphone Inputs Phantom power Line-level devices synthesizers, CD players, video Phantom Power will not be Used Tape in jacks Phonograph turntables Effects via Aux Send and Aux Return How to connect effect devices and signal processorsAbout stereo effect devices Using Aux 1 as an effects send Connecting an in-line processor Connections To a stereo PA system or instrument amplifier OutputsTo a mono system To a stage monitor foldback systemTo a stereo tape recorder To another mixerIn-line Adat recording To an Adat multitrack recorderUsing two Multimix 12Rs for more flexibility Connections Monitor Out PhonesConnections Before turning the mixer on, zero out the controls Operating InstructionsPeak LED method Setting input trim levelsMetering/Unity Gain method Unity gain points Typical Fader and Control LevelsTrim gain ranges Aux Send levelsProper gain staging of other equipment AUX System Effects Send/Receive How to Set Aux Send and Return LevelsPage Output distortion Using the meterSystem noise ground loops, hum, induced noise Avoiding noise① to Eliminate HUM if the Above has Failed Page Operating Instructions Multitrack recording ApplicationsTracking/Overdubbing Mixdown Using the High and LOW EQ controls Monitoring AUX 1 in the Phones jack Troubleshooting Index TroubleshootingPage Exterior cleaning Maintenance/ServiceRefer All Servicing to Qualified Technicians Connectors SpecificationsFrequency Response Impedance LevelsNoise performance typical PowerDistortion THD+N Dimensional Drawing Block Diagram Level diagram Tape IndexWarranty / Contact Alesis Contact Information