1
Ring-Out Technique
Ringing out a monitor means proactively finding its feedback frequencies before the show, instead of discovering them mid-song. You slowly raise the monitor's gain until one frequency starts to ring, apply a narrow notch cut exactly there, then push the gain further to find the next one.
It has a limit: after three to five notches the monitor starts to lose its natural tone. Past that point the answer is not more EQ, it is fixing the physical setup.
In practice: Three notches in and the wedge still feeds back and now sounds thin. Stop notching: reposition the wedge into the mic's null, move the mic, or switch the player to in-ears.
Notch out feedback before the show, but only 3-5 times.
2
Ring-Out Mastery: The Deep Technique
Ringing out a monitor means proactively finding its feedback frequencies: slowly raise the gain until a frequency sustains, identify it, apply a narrow notch only as deep as needed (3-6 dB).
The limit is real, about 6-8 notches before the monitor's tone is audibly degraded. Past that, more EQ is not the answer: the physical setup needs fixing.
In practice: Eight notches into a wedge and it still rings and now sounds thin: stop notching: reposition the wedge or the mic instead.
Ring out with narrow, shallow notches: past ~6-8, fix the setup, not the EQ.
3
Ringing Out a Wedge: Discipline, Not Bravado
A wedge ringout is a hunt for resonant feedback modes, not a vanity exercise. Push gain slowly, listen for the first hint of ring, identify its frequency by ear (or by a hot band on a graphic EQ if you have a feedback finder), notch it. Push higher; find the next mode; notch it. Stop with enough margin that the performer's actual peaks don't cause runaway feedback mid-show.
Bravado ringouts: pushing past the first mode to "see how high we can go": heat up drivers, blow tweeters, and damage the engineer's ears. Pros ring out fast, mark the modes, and move on.
In practice: Push wedge slow, find a 250Hz mode, notch -6dB at Q3. Push, find a 1kHz mode, notch -4dB. Push, find a 4kHz mode, notch -3dB. Done in 90 seconds, with 10dB of margin.
Slow push, narrow notch, ~10dB margin. Bravado kills tweeters.
4
Monitor EQ: Ring-Out and HPF
Every monitor wedge has to be rung out independently, not given a single shared EQ, because feedback frequencies depend on each wedge's position, the nearby mics' polar patterns, and the room surfaces right there. What rings on one wedge will not match another.
Also engage the HPF on every monitor send: low-frequency energy just wastes monitor headroom and couples into the stage floor.
In practice: Copying one wedge's graphic-EQ settings to all of them: the others will still ring at their own frequencies, ring out each wedge where it sits.
Ring out each wedge independently, feedback frequencies are position-specific.
5
Feedback in Monitors: Diagnosis with PFL
When a monitor feeds back mid-show, the problem is finding which wedge among several is ringing, fast. The tool is PFL: solo each monitor aux send into your headphones until you hear the ringing one.
Then apply the notch to that monitor send only, not the channel EQ or the main bus, so the fix touches only the problem wedge and leaves FOH and the other monitors untouched.
In practice: Feedback erupting from somewhere on stage: PFL each monitor send to find the ringing one, then notch that send alone.
Monitor feedback: PFL each send to find the ringing wedge, notch that send only.
6
HPF on Everything
A high-pass filter (HPF) removes the lowest frequencies from a channel. In live sound you engage it on nearly every channel, vocals, guitars, fiddle, even kick and bass set just below their useful range, because almost no source needs that sub-low energy, but every channel picks some up: stage rumble, foot noise, mic handling, HVAC, wind.
On its own each channel's low junk is small. Across a whole console it sums into a muddy mess that eats headroom. The HPF stops that buildup before it starts.
In practice: The mains sound muddy even though every instrument sounds clean soloed. That is low-frequency buildup across unfiltered channels, engage HPFs on all of them and the mix clears up.
HPF nearly every channel, low junk sums into mud.
7
Every Notch Costs Tone: Knowing When to Stop
A ring-out feels like free headroom and is not. Every notch is a transaction: you buy gain before feedback and you pay with a hole in the response, cut out of the same band the voice lives in.
Three or four narrow cuts are ordinary tuning and largely inaudible. Past roughly six you have removed enough of the vocal range that the wedge goes loud without going clearer, and the performer starts reporting the specific complaint that gives it away: it is loud and I still cannot hear myself. That is not a request for more level, it is a description of a response with a dozen bites taken out of it.
So treat notch count as a diagnostic rather than a score. A high count means there is an upstream cause you have been paying to work around: mic technique and distance, wedge geometry relative to the microphone null, a hard surface behind the performer, the wrong capsule, stage volume, or too many open mics. Find it, fix it, flatten the graphic and ring out again from scratch.
And keep every cut you do make narrow, because a wide filter removes far more programme material for the same headroom.
In practice: A singer telling you their wedge is loud but they cannot hear themselves after twelve notches: the notches are the problem now. Find the upstream cause, flatten the graphic, and start over.
Notches buy headroom and cost tone. A high count is a diagnostic pointing upstream, not a job well done.
8
Automatic Feedback Destroyers: Trust and Override
An automatic feedback destroyer uses FFT analysis to spot a frequency building in level with no harmonic content, then drops a narrow notch on it within milliseconds. Useful: but it has a real limitation: a sustained pure tone, like a held fiddle note or a vocal sustain, can look like feedback and get notched out.
Best practice: use "fixed" filters for known room modes, keep only 2-3 "live" filters for real-time protection, and set sensitivity as low as still works.
In practice: A feedback destroyer notching out a singer's sustained notes: too many aggressive live filters, cut back to 2-3 and lower the sensitivity.
Feedback destroyers can misfire on sustained notes, few live filters, low sensitivity.
These lessons are the teach side of knowledge cards from the Live Sound deck. In the daily plan each one is followed by a quiz, spaced over weeks, so it stays known rather than read once.