1
Fader Riding vs Compression: When to Use Each
Fader riding and compression both control dynamics, but at different timescales. Fader riding handles musical, section-level changes: verse to chorus, into and out of a solo. Compression handles momentary peaks, transients and unexpected spikes too fast for a hand.
The best live approach is both: light compression (2-3 dB of reduction) as the safety net, plus active fader riding for the music.
In practice: A vocal sounding lifeless under 6:1 heavy compression: it has flattened the musical dynamics, back the compression way off and ride the fader through the sections instead.
Ride faders for musical section changes; compress for momentary peaks, use both.
2
Vocal Compression for Live Acoustic
A live vocal needs compression to tame peaks, but in acoustic music it should be gentle. Use a low ratio (2:1-3:1), a medium attack (10-20 ms) so consonants articulate before the compressor clamps, and only enough threshold for 3-6 dB of reduction on the loudest phrases.
The key idea: the compressor is a safety net, not the primary dynamic control. Heavy compression flattens the expression that makes a vocal performance land.
In practice: A whisper-to-belt vocal sounding squashed under 4:1 fast-attack: drop to 2:1, slow the attack, and ride the fader for the rest.
Live vocal compression is gentle (2:1-3:1, 3-6 dB), a safety net, not the main control.
3
Vocal Compression on a Loud Stage
A vocal compressor on a loud stage is not just compressing the vocal. The mic hears the backline too, so every dB of gain reduction plus make-up gain lifts the bleed along with the voice. Compress hard enough and the quiet passages fill with guitar, the vocal reads as smaller rather than bigger, and you have spent gain before feedback to get there.
The fix is a higher threshold and a gentler ratio than a studio or a quiet room would want, roughly 3:1 catching only the peaks. Recover the rest physically: tighter pattern, closer mic technique, the wedge off the mic's hot axis, and stage volume under control. Fader rides handle what is left.
In practice: A screamed chorus and a whispered verse at 6:1: the verse fills with guitar bleed and the wedge starts ringing. Back off to 3:1 with a high threshold and fix the range with mic technique and stage volume.
On a loud stage, compression amplifies the bleed and spends your feedback headroom; compress gently and win the range physically.
4
Compression on Monitor Sends
Compression on a monitor mix must be inserted on the aux master output, not the channel strip, which would also compress the FOH mix.
The most valuable use is a limiter on a vocal monitor send: a feedback spike going straight into a wedge (or worse, an IEM) can be painfully loud, and a fast limiter with a high threshold catches that transient spike before it reaches the performer's ears.
In practice: A vocal wedge that briefly howls when the singer leans in: a limiter on that aux master catches the spike instantly, working alongside the notch filters.
Compress monitors on the aux master, a limiter there catches painful feedback spikes.
5
Compression for Speech and Presenters
Speech is compressed harder than music, and for a different reason: the goal is intelligibility, not expression. A listener who misses a word cannot ask for it again, so a flatter, more consistent level is the right outcome even though it would be wrong on a vocal.
A ratio around 4:1 with a threshold low enough to catch the quiet presenter, plus a limiter above it as a safety, handles a rotation of very different speakers. The trap is release time: a lectern mic is distant, so you are amplifying the room as well as the voice, and a fast release makes HVAC and audience noise breathe up between phrases. Slower, around 200 to 400 ms, moves the gain between sentences instead of between words.
In practice: Six presenters through one lectern: 4:1 catching the quietest, a limiter for the loudest, and a slow release so the room does not pump between sentences.
Speech wants flat and consistent, not expressive; watch the release or the room breathes.
6
Compression Against Backing Tracks
Pre-mastered backing tracks arrive dense and already limited. Compressing them again does nothing useful and usually produces audible pumping, because there is no dynamic range left for a compressor to act on.
The problem worth solving is the mismatch. A live drummer and bass player carry far more dynamic range than the tracks do, so they read as inconsistent sitting next to material that never moves. Compress the live elements harder than you otherwise would to bring their consistency up to the tracks, and consider parallel compression so the live parts keep their transient life while gaining the steadiness.
In practice: A live kick swinging around a rock-steady programmed one: compress the live channel, use a parallel path to keep its attack, and leave the track untouched.
Never compress the tracks; compress the live elements up to the tracks' consistency.
7
Compressors in Live Sound
Live compression plays two distinct roles. On individual channels, gentle compression: 2-4 dB of gain reduction, tames dynamics. On the main outputs, a limiter acts as a safety net, catching transient peaks before they damage speakers and amps.
Unlike studio mixing, keep it subtle: heavy compression raises the channel's overall level, which amplifies stage bleed and increases feedback risk. Tame the peaks, don't flatten the performance.
In practice: A vocalist whispering then belting: 3:1-4:1 for 3-6 dB of reduction, medium attack, but ride the fader for the big swings rather than compressing harder, which would feed back.
Live: gentle channel compression and a main-bus limiter, heavy compression invites feedback.
8
Limiter on the Main PA
A limiter on the main PA bus is a safety device, not a musical tool. Its job is to protect speakers and stop painful volume spikes for the audience, so it runs a fast attack, a brickwall ratio, and a threshold set just below the system's safe maximum.
The tell: it should rarely engage. A limiter flashing constantly means the mix is simply too loud for the system.
In practice: A venue's PA limiter flashing all through every chorus on a system that has blown speakers before: pull the master back, the limiter is a backstop, not a loudness control.
The mains limiter is speaker protection, if it engages constantly, the mix is too loud.
9
Standup Bass Compression for Live Sound
An upright bass almost always needs compression live, because its level is genuinely erratic, huge swings between plucked and bowed notes, plus pickup inconsistency. The settings: 3:1-4:1, a slow-ish attack (20-30 ms) so the pluck transient survives, fairly fast release.
Adding a limiter after the compressor is wise, a safety net for the extreme peaks that could damage speakers.
In practice: An upright alternating pizzicato and arco where bowed notes pump: slow the attack and release, or split into a gentle compressor plus a peak-catching limiter.
Upright bass needs compression, 3:1-4:1, slow attack to keep the pluck, limiter as backstop.
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.