From microphone to LED screen
A congress depends on technology nobody notices. The back row hears the speaker as clearly as the front, the presentation is readable from every seat and the stage looks as though it had always been there. Behind that ease lie dozens of decisions: which microphone type suits a panel discussion, how much brightness a projector needs in a room with daylight, and where to place the control position so the technician can see both stage and audience. IFS Audiovisueel has been making those decisions since 1962, together with you and tailored to your venue, your programme and your audience. Below you will find what congress technology involves: sound, vision and lighting, and what to look out for.
Sound is the first thing an audience notices when it goes wrong. We match the sound system to the size and acoustics of the room, so the speaker is equally intelligible everywhere, including at the back and under a balcony. Which microphone suits depends on the programme: a headset or lapel microphone leaves a moving speaker's hands free, a lectern or table microphone works for a tightly run programme, and for questions from the floor we use wireless handheld or roving microphones. For panel discussions, general meetings and council meetings we use discussion systems: every participant gets their own unit with a talk button, so the floor is shared in an orderly way and nobody talks over anyone else. Wireless microphones require frequency management; we establish in advance which frequencies are free at the venue, so there is no interference or dropout during your congress. For hard-of-hearing participants we install a hearing loop or use Auracast. Throughout the programme a sound engineer sits at the desk, mixing and adjusting live.
Whether projection or an LED screen is the better choice depends mainly on the light in the room. A projector with the right brightness and lens gives a large image at lower cost, but needs a room that can be dimmed. An LED screen stays bright and high in contrast even in full daylight and under strong stage lighting, and needs no throw distance. We calculate in advance which size and aspect ratio suit the room, so even the back row reads the slides effortlessly. On stage we place a confidence monitor so the speaker can see their own presentation without turning around, with notes and a countdown clock for speaking time if wanted. All presentations and videos are loaded centrally in advance and tested on the day, so there is no shuffling of laptops and cables between speakers. From the control position we switch seamlessly between presentation, video and camera. In large rooms we use cameras for image magnification, so the speaker is clearly visible from the back as well.
Lighting determines how your speakers come across, both in the room and on camera. We light the stage so faces appear open and natural, without harsh shadows and without a speaker squinting into their own screen. We also use light to give the room atmosphere: colour accents in your house style on the back wall, calmer room lighting during presentations and more energy during breaks and networking. The stage itself is built to measure from modular decking, at the height that suits the sightlines of the room, with a catwalk or seating stand if required. Pipe & drape gives you a clean back wall in a short time, hiding cables and doors while providing a calm background for screens and cameras. Banners, décor and branding in your own house style complete the picture, so the stage looks exactly as you pictured it from the very first second.
The room decides more than people think. A theatre layout has everyone facing forward and calls for one large screen; with a cabaret or café layout part of the audience sits at an angle and you often need a second screen. Columns, a balcony or a low ceiling can break the sightlines, and a room with a lot of glass and hard floors reverberates, which harms intelligibility more than an underpowered sound system does. So we look at the floor plan in advance and, where possible, at the room itself: where the stage goes, how far back the last row sits, which seats have no view and where the control position can stand without ending up in a walking route. On that basis we advise on the layout and match the technology to it, rather than the other way around.
That depends on who is speaking and how the programme runs. A lapel microphone or headset gives the speaker freedom of movement and a constant level, even when they turn towards the screen. A lectern microphone suits a formal programme with a fixed speaking position. For questions from the floor, wireless handheld microphones work fastest, supplemented by a throwable microphone in large rooms. For panels and meetings we use discussion units with a talk button, so the floor is shared in an orderly way. In practice we combine these types within a single congress. What matters is that all wireless microphones run on free, mutually separated frequencies; we establish and programme that in advance.
A projector is more economical for a large image area and works excellently in a room that can be dimmed. An LED screen stays bright under daylight and strong stage lighting, needs no throw distance and delivers a deeper, higher-contrast image, which makes it the better choice in rooms with many windows, low ceilings or a busy stage. Viewing distance counts too: the further back the last row, the larger the image needs to be. We calculate this in advance from the floor plan of the room and advise which solution fits your programme and budget.
We prefer to collect all presentations and videos a day in advance. We load them centrally onto one system, check layout, fonts and aspect ratio, and test the videos for sound. During the congress the technician plays the right presentation from the control position and switches between slides, video and camera. The speaker advances their own slides with a presenter and sees them again on a confidence monitor. That way there is no shuffling of laptops and cables between speakers and you lose no time between sessions. Late changes are no problem; we process them up to just before the start.
For a compact meeting with sound, a projector and one speaker, a single technician is often enough. As soon as multiple cameras, a livestream, parallel sessions or interpreting equipment are involved, we work with a team in which everyone has their own task: sound, vision and vision mixing. With several rooms running at once we assign a technician per room, plus a project manager who oversees the whole and is the point of contact for you and for the venue. Our technicians arrive in suits, equipped with laptop and service case, and stay for the whole day.
For a standard set-up in a familiar room, a few weeks ahead is usually enough. For a large or multi-day congress, parallel sessions, a livestream or interpreter booths, we prefer to plan several months ahead, certainly around the busy periods in spring and autumn. We are happy to visit the venue beforehand to determine sightlines, power, rigging points and the place of the control position. We are also glad to think along at short notice; let us know and we will see what is possible.
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