Channel input strip[edit]
The input strip is usually separated into these sections:
Input jacks
Microphone preamplifiers equalization Dynamics processing (e.g. dynamic range compression, gating)
Routing including direct outs, aux-sends, panning control and subgroup assignments
Input Faders
On many consoles, these sections are color-coded for quick identification by the operator. Each signal that is input into the mixer has its own channel. Depending on the specific mixer, each channel is stereo or monaural. On most mixers, each channel has an XLR input, and many have RCA or quarter-inch TRS phone connector line inputs.
Basic input controls[edit]
Below each input, there are usually several rotary controls (knobs, pots). The first is typically a trim or gain control. The inputs buffer the signal from the external device and this controls the amount of amplification or attenuation needed to bring the signal to a nominal level for processing. This stage is where most noise of interference is picked up, due to the high gains involved (around +50 dB, for a microphone). Balanced inputs and connectors, such as XLR or phone connectors, reduce interference problems.
There may be insert points after the buffer/gain stage, which send to and return from external processors which should only affect the signal of that particular channel. Effects that operate on multiple channels are connected to the auxiliary sends (below).
Auxiliary send routing[edit]
The auxiliary send routes a