Aux Sends are simply what the name implies, an auxiliary send of the audio signal or source input for that channel strip. On mixers with "Pre/Post" EQ selector buttons for these controls, they will come after the EQ section, otherwise they will be right after the Gain, Trim, etc. This extremely versatile "knob set: allows you to route the channel signal to an outboard effects processor, recording device, assistive listening or broadcast output. Additionally Aux Sends are often used to provide a separate mix for the stage monitors. The reason for there being more than one Aux Send control on the channel and more than one Aux Master Control is so that you can mix for more than one monitor system. The drummer, for example, usually needs to hear himself and the vocals extra loudly, and the vocalists, of course, need to hear themselves very loudly while the guitarist might want to hear a predominance of bass and keyboards because his amp is almost all he can hear.
The EQ or Equalizer section usually follows the Aux Sends and is usually desirable only on that portion of the channel signal headed for the FOH system.
For example, stage monitors operate in a terribly demanding acoustic environment - speakers are close to mics and everything tends to be very loud. As a result, the best way to mix for monitors is to treat them as a totally independent system. Large concert PA's usually have a separate monitor mixer and someone to run it. Smaller systems still need to treat the monitor mix as separately from the main mix as possible. That is why the channel signals would not, as a rule, be EQ'd before being sent to the Mon/Aux busses. That way, the only equalization they get will be specifically for the stage monitor system.
For that reason, some mixers have Aux Send controls after the EQ with "Pre/Post" selector buttons to put the desired ones through the channel EQ ("Post") or to bypass it ("Pre"). In other mixers, one or more of the Mon/Aux controls may simply be after the EQ (i.e. "post EQ") and are therefore permanently affected by it.
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Experiencing Worship, The Study