FOH / Mons Mixing / Gain Staging Setup Procedure

Gain Staging Setup Procedure Console Setup

Every mic that hits your console is putting out a wildly different voltage — a distant flute capsule and a mic jammed an inch from a kick beater aren't in the same universe electrically. The trim/gain knob at the top of the channel strip is what reconciles that, and getting it right there is what keeps the whole signal chain quiet. This is a straight, sequential setup routine — reference SRH-GAIN-STAGE-01 — so work it top to bottom rather than jumping around.

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Key facts

Mic-level signals can swing from around 0.00001V (a quiet, distantly-miked source) up to roughly 10V (a hot kick mic on a hard hit) — on the order of a million to one.
Rule of thumb: keep the electronics' noise floor at least 40 dB below the quietest signal you expect to send it, or you'll hear the console before you hear the source.
Take as much gain as you safely can at the mic preamp stage before leaning on downstream faders — every extra dB you're forced to add later adds noise along with it.
Target meter reading once gain is set: peaking around 0 VU, or roughly two-thirds of full scale.
Standard sub-mixer/line-level references worth knowing: -20 dBu (~78 mV), -10 dBV (~316 mV), and +4 dBu (~1.23 V) nominal.

Set the Starting Point

Spin the channel's trim/gain knob all the way down (usually full counter-clockwise) and confirm any pad or attenuator switch is off — you want zero help from either before you begin. Run the channel fader up to near the top of its travel — most strips mark a nominal or unity line on the scale; use that as your reference point. Do the same with any submaster faders in use, and with the master fader — get them up near their nominal mark too, not buried down low.

Bring Up the Gain

With everything else parked near nominal, slowly bring the trim/gain up until the channel meter is hitting your target level. Because the faders are already near the top, whatever gain you dial in here is genuinely coming from the preamp, not being masked by a fader that's still got room to give.

If It's Still Distorting: Reach for the Pad Last

If the signal is crunchy even with the trim backed off and the faders pulled down, and it still won't clean up, the source is probably just too hot for the preamp (or input transformer) to swallow before the gain control even gets a chance to act. Only now switch in the pad or mic attenuator. Doing it earlier throws away signal before it ever reaches the preamp, which means you then have to add more gain to compensate — and every bit of that makeup gain brings noise with it. Pad last, not first.

Protect the Summing Amp and Power Amp

Watch for this symptom: meters read fine but the sound is faintly crunchy, and you find yourself pulling the submasters or master way down just to tame the output. That's the summing amp in the bus or master section getting overloaded upstream of the fader that's supposedly controlling it. If your console has a separate bus trim, back that off instead of relying on the fader alone. If it's the power amp clipping, pull back its input sensitivity control rather than dumping all the reduction into your console faders — this also buys back useful fader travel on the submasters and master. No input control on the power amp? Spread the needed reduction across input gain, submasters, and masters together rather than dropping it all on the master fader alone — you'll keep more usable travel across the whole signal path that way.

Source: Davis, Gary D. & Jones, Ralph. The Sound Reinforcement Handbook, 2nd ed. (Hal Leonard/Yamaha). Section 11.7, pp.172-175. Rewritten in Ryan's own words from the source material.