Monitor Wedge Tuning: Clarity on Stage Without Feedback

The Monitor Engineer's Challenge

Stage monitoring is fundamentally harder than FOH mixing. The monitor speaker and the microphone are in the same acoustic space, typically 1-3 meters apart, with the microphone pointed roughly toward the monitor (or at least not away from it). This geometry maximizes the feedback risk that FOH systems are designed to minimize.

The performer wants their monitor louder. The engineer knows that louder means closer to feedback. The solution is not volume — it is intelligibility. A well-tuned monitor at 90 dBA sounds "louder" to the performer than a muddy, resonant monitor at 95 dBA.

Ring-Out EQ Procedure

Before the performer arrives on stage, tune each monitor wedge individually:

1. Place a measurement mic at the performer's head position (use a mic stand at ear height).
2. Open the RTA in SonaVyx with 1/6 octave smoothing.
3. Send pink noise to the monitor channel at a low level.
4. Slowly increase the monitor send gain until a narrow peak begins rising in the RTA — this is the first feedback frequency.
5. Note the frequency. Apply a notch filter: Q = 10-16, gain = -6 dB.
6. Continue increasing gain. The next frequency will ring. Apply another notch.
7. Repeat until you have placed 6-10 notches and achieved the target GBF.

The feedback elimination workflow automates step 4-6: the problem detector identifies rising feedback frequencies in real-time and suggests notch parameters.

Monitor System EQ

After the ring-out notches are set, the monitor's frequency response will have narrow dips at the notch frequencies but may still have broad tonal imbalances. Measure the transfer function with pink noise through the monitor and apply broad corrections:

• Low-mid cut at 200-400 Hz (floor coupling makes wedges boomy): -4 to -6 dB, Q = 0.8
• High-pass at 80-100 Hz (wedges should not reproduce sub-bass)
• Presence boost if needed at 2-5 kHz for vocal clarity: +2 to +3 dB, Q = 1.0

The AI diagnostic can analyze the monitor TF and suggest corrections specific to the monitor model if an equipment scan is available.

Stage Volume Management

Excessive stage volume is the hidden enemy of FOH mix quality. Every dB of stage noise that reaches FOH microphones reduces the engineer's control over the mix. A general guideline:

• Target: Each wedge at 90-95 dBA at 1 meter
• Maximum: Combined stage SPL should not exceed 98 dBA at the drum position
• Measurement: Use the SPL meter with A-weighting and Fast time constant at the mic position

IEM vs Wedge: The Measurement Perspective

Parameter	Wedge Monitor	In-Ear Monitor
GBF challenge	Severe (shared space)	None (isolated)
Stage SPL contribution	90-100 dBA per wedge	0 dBA
Frequency response	Limited by wedge + room	Determined by IEM driver
FOH mic bleed	Significant	None
Performer preference	Physical feel, familiar	Isolation, detail
Hearing safety	Variable (depends on stage)	Controllable (limiter)

From a measurement standpoint, IEMs are strictly superior — they eliminate the feedback loop entirely. But many performers prefer the physical sensation of wedges, especially for bass-heavy music. The noise dose calculator can track cumulative exposure for performers using either system.

Multi-Wedge Stages

A full band stage might have 6-12 wedge mixes. The cumulative SPL from all wedges creates a noise floor that limits FOH mix clarity. Strategies:

• Reduce the number of open wedge sends (each doubling costs 3 dB in the NOM equation)
• Use side-fills for drums and bass instead of individual wedges
• Gate or automate wedge sends to mute between performer activities
• Hybrid approach: IEMs for vocalists (highest feedback risk), wedges for instrumentalists

The audience absorption effect reduces stage bleed impact during the show compared to soundcheck — but do not rely on this. Tune for the worst case (empty room).