Who is the FOH engineer?

The FOH engineer is responsible for the mix heard by the audience. FOH stands for Front of House and practically refers to both the role of the engineer and the mixing position located on the audience side.

The FOH engineer receives signals from microphones, DI boxes, electronic instruments, playbacks, and other sources on stage. Their task is to create a coherent mix and deliver it to the PA system.

Mix for the audience

The FOH engineer controls, among other things:

• the proportions of instruments and vocals,
• gain structure,
• EQ correction,
• dynamics,
• effects,
• groups and DCA,
• routing,
• the level of the entire mix.

It's not just about making every instrument audible. FOH must decide which elements should be in the foreground at any given moment, which can remain more in the background, and how to utilize the available headroom of the system.

During the concert, the mix is constantly adjusted. Musicians change the dynamics of their playing, the vocalist may sing differently than during rehearsal, and the acoustic level from the stage also affects what the audience hears.

Therefore the FOH operation during the concert is a process carried out throughout the performance, not just a one-time setting of the mix during soundcheck.

Where is the FOH position located?

The FOH position should be located in a representative part of the audience, where the engineer can hear the main system similarly to the audience.

Ideally, it should have:

• direct visibility of the stage,
• monitoring of the main PA,
• a position as close to the system axis as possible,
• acoustic conditions similar to most of the audience.

Placing the FOH behind a wall, in a closed booth, or far to the side significantly hinders the assessment of the mix.

The engineer mixing the concert must hear the result of their decisions. Measuring the level on the console alone does not indicate how the sound behaves in the room and what actually reaches the audience. 

Who is the monitor engineer?

 The monitor engineer is responsible for what the performers hear on the stage. Their task is to prepare a separate mix or several mixes for musicians, vocalists, and others who need monitoring.

Monitoring can use:

• wedge,
• sidefill,
• drum fill,
• wired IEM,
• wireless IEM.

Each musician may need completely different proportions.

The vocalist may primarily want their own voice and keys, the drummer bass and click, and the guitarist vocals and a small amount of the rest of the band.

Mixes for performers

The monitor engineer usually creates several or a dozen independent mixes.

In the case of IEM, these are often stereo mixes, which additionally increases the number of required buses and outputs.

The monitor engineer must control:

• levels of individual sources,
• EQ of each mix,
• dynamics,
• pan in IEM,
• talkback,
• safety of the listening level,
• reactions of musicians on stage.

In the case of wedges, there is a particular control of gain before feedback. The vocal microphone is located close to the monitor, so an improper level or EQ can quickly lead to feedback.

With IEM, the problem is not feedback from the headphones themselves, but there is a greater responsibility for the stability of the mix and the RF system.

Monitor position by the stage

The monitor console is usually located to the side of the stage in the area referred to as the monitor world.

This allows the monitor engineer to:

• see the musicians,
• observe their gestures,
• quickly respond to requests for changes,
• have contact with stage technicians,
• be close to IEM systems and RF infrastructure.

Non-verbal communication is very important during a concert. A musician can gesture for more vocals or guitar, and the monitor engineer should be able to respond without stopping the performance.

FOH, MON and system engineer – three different scopes of work

FOH, monitor engineer and system engineer are responsible for three different parts of the production, although their actions influence each other.

The FOH engineer primarily deals with the content of the mix. The system engineer is responsible for ensuring that the PA system correctly delivers this mix to the audience.

The tasks of the system engineer may include:

• prediction of the system,
• configuration of the PA,
• alignment,
• tuning,
• managing DSP,
• balancing main PA, subwoofers and fills,
• controlling the system's operation during the concert.

This is an important distinction. FOH can prepare a very good mix, but if the PA is poorly placed or improperly tuned, the audience will not hear it correctly.

On the other hand, the monitor engineer does not "mix the concert for the room". His recipients are primarily the people on stage.

How does the signal reach both FOH and monitors simultaneously?

The signal from one microphone often needs to go simultaneously to two independent mixing systems. This can be achieved through an analog split, digital sharing of the stagebox, or another architecture provided by specific systems.

Analog split

The analog splitter divides the microphone signal before consoles.

The diagram then looks simplified:

microphone → splitter → FOH

microphone → splitter → MON

Both consoles receive their own output from the splitter.

A major advantage is the ability to achieve a high degree of independence between positions. Each console can have its own analog gain, depending on the design of the used splitter and the entire configuration.

Analog split is still useful especially in situations where different mixing platforms collaborate.

Digital split

In a digital system, the same stagebox can provide channels to several consoles via a network or dedicated audio protocol.

This means that a complex analog splitter is not always necessary.

Advantages may include:

• less analog cabling,
• fast routing of a large number of channels,
• easier integration of systems within the same ecosystem.

However, it is necessary to check how a specific architecture manages preamplifiers and gain.

Gain sharing and gain independence

If FOH and MON use the same analog preamplifier, a change in gain by one engineer can affect the level of the signal received by the other.

This can be problematic during a concert.

Depending on the platform, the following is used:

• one owner of the analog gain,
• digital trim on the second console,
• gain compensation,
• completely independent preamps thanks to the split.

For example, the monitor engineer may own the gain, because their IEM mixes are very sensitive to sudden level changes. FOH then receives the signal and adjusts it using digital trim.

There is no single architecture suitable for all concerts. It is important that the way the signal is split and responsibility for gain are established before the soundcheck..

What does the FOH engineer's work look like during the soundcheck?

During the soundcheck, the FOH engineer prepares the base mix for the concert and checks how the sources from the stage interact with the PA system and acoustics of the venue.

The process is usually preceded by a line check, during which the correctness of the patch and all channels is checked.

FOH then controls:

• gain,
• polarity where it matters,
• basic EQ,
• dynamics,
• routing,
• groups,
• effects,
• ratios of instruments.

During the actual soundcheck, work with the entire band begins.

However, it is not about creating a mix that will later remain unchanged. An empty room often behaves differently after the audience enters, and performers during the actual concert may play differently than in rehearsal.

The soundcheck thus provides a starting point and allows for early detection of problems.

What does the monitor engineer's work look like during the soundcheck?

The monitor engineer uses the soundcheck primarily to build monitors in which each performer can comfortably and safely play the concert.

The process is often more individualized than the work of FOH.

The engineer can sequentially prepare:

• the mix of the vocalist,
• guitarist,
• bassist,
• drummer,
• keyboardist,
• and the remaining musicians.

Each of them reports their own needs.

With wedges, it is also necessary to check the stability of the system and the margin before feedback. With IEM, the proportions, stereo panorama, ambience, and the operation of the entire RF system are important.

The monitor engineer should also pay attention to whether the performer is trying to solve the monitoring problem by continuously increasing the levels.

Sometimes a better solution is to remove the masking element rather than adding another source louder and louder.

How do FOH and MON communicate during a concert?

FOH and MON must have the ability to quickly exchange information, as both positions use the same sources and respond to the same stage situation.

Communication can take place via:

• talkback,
• intercom,
• technical communication,
• direct contact during rehearsals.

For example, FOH may notice a problem with a specific microphone, but is technically far from the stage. The monitor engineer or stage tech can check the physical source of the problem more quickly.

On the other hand, the monitor engineer can inform FOH that the musician has changed the instrument, amplifier level, or way of working on stage.

The most important thing is to establish responsibilities in advance. If both people are trying to fix the same problem in different ways at the same time, the situation can become even more unpredictable.

When can one person manage FOH and monitors?

One person can manage FOH and monitors when the production is relatively simple, the number of mixes is small, and monitoring can be conveniently controlled from the FOH console.

This is a commonly encountered solution in:

• small club concerts,
• small bands,
• simple events,
• a few wedge mixes,
• a limited number of channels.

The FOH engineer then prepares the main mix and simultaneously sends individual channels to the monitor buses.

Such a solution reduces the amount of necessary equipment and crew, but has limitations.

FOH does not directly hear what is in the wedge on stage. They can use the solo or bus monitoring function, but still assess the sound from a different acoustic location.

With IEM, the situation is even more demanding, as several independent mixes may require constant changes during the performance.

When is it worth separating both positions?

FOH and MON should be separated when monitoring becomes a separate, complex task requiring constant control.

Typical situations include:

• a large number of musicians,
• many independent mixes,
• a few stereo IEMs,
• a large number of wedges,
• sidefill and drum fill,
• extensive RF,
• a complicated rider,
• quick changes between bands.

At a large concert, FOH should be focused on the audience. If at the same time it has to respond to requests from six musicians regarding monitors, control the concert mix, and diagnose a problem with IEM, the scope of duties can become too large.

A separate monitor engineer can, on the other hand, constantly observe the stage and respond immediately to the needs of the performers.

In such productions providing separate engineers for FOH and monitors is not multiplying positions unnecessarily, but dividing two parallel processes that require continuous attention.

The way the entire system is prepared should be agreed upon in advance in the rider and during the technical advance before the concert.

Why does a good monitor mix also affect FOH?

Good monitoring can improve the FOH mix because it affects the acoustic level of the stage and the way the performers play.

If musicians hear each other poorly, they often try to compensate for the problem:

• by turning up the amplifiers,
• asking for more monitors,
• playing louder,
• singing differently.

As a result, the stage level increases.

In a small club, FOH does not have full control over the balance, as part of the sound reaches the audience directly from the stage. The guitar amplifier may already be too loud in the front rows, even if its channel on the console is completely muted.

Loud wedges also reach the microphones and increase the bleed. The vocal microphone starts to pick up not only the voice but also a greater amount of instruments and monitors.

Well-prepared monitoring can therefore:

• limit unnecessary stage level,
• improve performer comfort,
• reduce auditions,
• increase FOH control over the mix.

IEM systems can additionally limit the energy generated by the wedge, although they do not automatically eliminate all sound sources on stage.

Therefore, monitoring and FOH are not two completely independent systems. What happens in the monitor world directly affects the material that the engineer works with for the audience.

Summary

The FOH engineer and the monitor engineer work with the same concert, but for different audiences. FOH is responsible for the mix heard by the audience, while the monitor engineer is responsible for the musicians' monitoring on stage. The system engineer has yet another role – primarily responsible for the configuration, tuning, and proper operation of the PA.

At small concerts, one person can successfully handle both FOH and monitors. However, as the number of channels, IEM mixes, wedges, and RF systems increases, monitoring becomes a separate task requiring constant attention.

Separating positions allows FOH to focus on the audience, while the monitor engineer focuses on the performers. Well-prepared monitoring affects not only the comfort of the band but also the stage level, auditions, and the final quality of the FOH mix.

Frequently Asked Questions