Choosing the Right Speaker for Conference Success

Choosing the right speaker for a conference is about more than volume. It is about delivering crystal-clear sound to every person in the room, whether your audience is 50 or 5,000. The key lies in matching the audio system to the unique acoustics of the space, not just the headcount.

Matching Audio to Your Venue and Audience

Before considering specific speaker models, the first task is to assess your environment. The relationship between the room's physical characteristics and your audience size is critical. A sound system that performs perfectly in a small hotel meeting room will be entirely unsuitable for a vast exhibition hall.

Analysing the Venue Space

Every room has its own acoustic personality. During a site visit, it is essential to think like a sound engineer. Look beyond the decor and focus on the physical factors that will determine your audio success.

• Room Dimensions: Note the length, width, and particularly the ceiling height. High ceilings are known for creating echo and reverberation, which means you will need a system that can tightly control sound direction.
• Surface Materials: Are you surrounded by hard, reflective surfaces like glass walls, polished floors, or large windows? These are enemies of clear audio, bouncing sound waves around the space and making speech sound muddy.
• Acoustic Obstructions: Look for pillars, low-hanging light fixtures, or unusual L-shaped layouts. These can create "sound shadows," leaving pockets of the audience unable to hear clearly.

Conversely, elements like thick carpets, curtains, and purpose-built acoustic panels are beneficial as they absorb sound and reduce unwanted reflections. A good AV team can work around the challenges of most venues. If you are evaluating different locations, our guide to the top London conference venues and their AV potential can help you understand what to expect.

Sizing Up Your Audience

The number of attendees is the other half of the equation, directly influencing the power and scale of the system you will need. A small group of 50 in a breakout session may only require a pair of discreet, high-quality speakers. For 500 people in a ballroom, a much more substantial setup is required, often with 'delay' speakers placed further back to ensure consistent sound from front to back.

The goal is always to achieve a consistent Sound Pressure Level (SPL) for everyone. The person in the back row should have the same clear experience as someone in the front, without the volume being uncomfortably loud for anyone.

This is where experience is vital. As the UK's event capital, London hosts a vast number of conferences. Over 70% of all UK conferences take place here, with an average attendance of around 100 delegates. An experienced local provider will know the city's venues well, making it easier to specify the perfect speaker for conference needs of any size. You can find more figures on UK conference statistics at imagovenues.co.uk.

To provide a general idea of what might be required, we have created this simple table. It serves as a starting point for discussions with your AV partner.

Speaker System Requirements by Audience Size

Providing your AV team with accurate delegate numbers and a detailed floor plan is one of the most important steps for a successful event. It allows technicians to calculate coverage correctly and select the right equipment to ensure your message is heard, loud and clear.

Decoding Conference Speaker Types

An equipment list from an AV provider can feel overwhelming, with terms like ‘point source’, ‘line array’, and ‘monitors’. Understanding what these different speakers do is the first step to ensuring you get the right equipment for your conference.

The main speakers your audience hears are called the 'Front of House' (FOH) system. However, the presenters on stage also need to hear themselves, which requires a separate set of speakers. The key is to select the right tool for each job.

Point Source Speakers: The Versatile Workhorse

For the vast majority of corporate events, such as those in hotel conference suites, breakout rooms, and halls for up to 250 people, the point source speaker is the standard. These are the classic, individual speakers you see on stands on either side of a stage. They are an industry staple for good reason.

They project sound from a single point in a set pattern, similar to the beam from a torch. Their strength lies in their simplicity and effectiveness for most standard conference setups. A pair of quality 12-inch point source speakers is ideal for a product launch in a typical London hotel venue, providing excellent vocal clarity and enough power to fill the room.

Line Array Systems: For Large-Scale Coverage

Once your audience exceeds 500 and you are in a large auditorium or exhibition hall, point source speakers are no longer sufficient. Sound loses energy over distance, and with a standard setup, people in the back rows will hear a weak, unclear sound. This is where line array systems are essential.

A line array is not a single speaker but a series of speaker cabinets hung one below the other in a 'J' shape. By carefully angling each box, a sound engineer can sculpt the sound and direct it with remarkable precision.

This provides two major benefits:

• Consistent Volume: The sound level at the back of the room is almost identical to the front.
• Pinpoint Accuracy: Sound is focused directly on the audience, not on the ceiling or walls. This dramatically reduces echo and reverberation, making speech much more intelligible, especially in acoustically challenging spaces.

A line array ensures that a delegate in row 30 has almost the same audio experience as someone in row 3. For high-stakes events where every word matters, this level of control is non-negotiable.

Foldback Monitors: Giving Presenters Confidence

While the audience is covered by the FOH system, the people on stage also need to hear. This is the job of foldback monitors, often called 'wedges'. These are the low-profile speakers placed on the floor at a presenter's feet, angled up towards them.

Their sole purpose is to provide a direct audio feed to the people on stage. Without them, a presenter would only hear the delayed, reflected sound from the main FOH speakers. This can be very distracting and cause even seasoned speakers to stumble over their words or raise their voice unnecessarily.

Consider these two common scenarios:

• The CEO Keynote: A pair of discreet foldback monitors gives your CEO a clear feed of their own voice, allowing them to relax and focus on their message.
• The Panel Discussion: On a four-person panel, providing each panellist with their own small monitor is best practice. It helps them hear each other clearly, leading to a more natural and fluid conversation.

Understanding these three basic speaker types will enable more productive conversations with your technical team. To see the kind of professional-grade speakers we use, please review the audio section in our full equipment hire catalogue. It is a useful way to familiarise yourself with the equipment that contributes to a flawless conference.

Technical Specifications That Actually Matter

Once you have decided on the general type of speaker, it is time to consider the details that distinguish clear, crisp sound from a muddled, frustrating mess. You do not need to be a sound engineer, but understanding a few key concepts will help you communicate effectively with your AV team and ensure you get the right equipment.

This knowledge allows you to have a confident conversation and ensures you receive the performance you are paying for.

Sound Pressure Level and Coverage Patterns

Have you ever attended an event where the sound was painfully loud for those in the front row, while people at the back were straining to hear? That is a classic sign of poor sound management, and it comes down to two factors: SPL and coverage.

Sound Pressure Level (SPL) is the technical term for loudness, measured in decibels (dB). A good sound engineer aims for a consistent SPL across the entire room, ensuring the audio level is comfortable and intelligible for every person, regardless of where they are sitting.

Next is the speaker's coverage pattern, or dispersion. This defines the angle at which a speaker projects sound, both horizontally and vertically.

• A 90° horizontal dispersion is wide, covering a large area from left to right.
• A tighter 50° vertical dispersion helps focus the sound on the audience, preventing it from bouncing off the ceiling and creating echoes.

An experienced AV crew uses this data to "paint" the room with sound, choosing and positioning speakers to cover every seat without gaps or unnecessary overlap.

The Audio Signal Chain Explained

A speaker is only the final piece of a larger system. For sound to travel from the presenter's mouth to the audience's ears, it passes along an audio signal chain. If any link in this chain is weak, the final result will be compromised.

Here is the typical journey of an audio signal:

• It starts at the Microphone, which captures the presenter’s voice.
• Laptops or instruments often go through a DI Box (Direct Injection) to convert their signal for the main system.
• All signals then flow to the Mixing Desk, the central hub where an engineer balances levels, adjusts frequencies for clarity (EQ), and routes the sound.
• The signal then goes to an Amplifier, which provides the power to drive the speakers. With modern powered speakers, the amplifier is built directly into the speaker unit.
• Finally, the Speakers convert the electrical signal back into the sound waves the audience hears.

Understanding this helps explain why professionals focus on the entire system, not just the speakers. A great speaker fed with a poor signal will still sound poor. You can find out more in our guide on what is audio visual equipment.

A professional AV setup ensures every link in the signal chain is solid and of high quality. This technical integrity gives a presenter’s voice authority and impact, which is essential for an inclusive and effective event.

This is particularly important in professional settings where every voice matters. For instance, in UK medical conferences, women still account for only 30.1% of speakers, according to research in the British Medical Journal. Ensuring their contributions are delivered with absolute clarity by a professional team like London Audio Visual Hire means that technical issues never obstruct the sharing of vital information.

Common Audio Mistakes and How to Avoid Them

Even with meticulous planning, a conference can be remembered for the wrong reasons if the audio fails. The piercing squeal of feedback during a keynote or a panellist who is difficult to hear can instantly damage your event's credibility.

Fortunately, nearly all these audio issues are avoidable. It requires foresight and an open conversation with your AV provider. Knowing the common pitfalls allows you to build safeguards into your plan from the start.

Under-Specifying the Sound System

A common mistake is choosing a sound system based on price alone, without considering the room or audience size. The small pair of speakers that sounded great in a 50-person seminar will be lost in a 300-delegate hall.

When this happens, the only option is to increase the volume to its maximum limit. The result is a distorted, harsh sound that is unpleasant to listen to. It also strains the equipment, increasing the risk of failure during the event. Always provide your AV team with accurate floor plans and delegate numbers so they can specify the right speaker for conference coverage, not just raw volume.

Forgetting About Radio Microphone Interference

Central London is one of the most crowded radio frequency (RF) environments in the world. With countless other events, security teams, and broadcasters all competing for wireless channels, the risk of interference with your microphones is high.

To avoid hearing another event's audio or having a presenter’s microphone drop out, you must work with a team that takes this seriously.

• RF Coordination: A professional audio technician will use specialised software to scan the airwaves on-site. They will find and allocate clean, interference-free frequencies for all wireless microphones and in-ear monitors.
• Licensing: For larger events using many wireless channels, your AV provider might need a specific Ofcom licence. This guarantees you exclusive use of certain frequencies in that area for that time.
• Quality Equipment: This is non-negotiable. Professional-grade wireless systems from a reputable supplier like London Audio Visual Hire are designed for congested RF environments. Cheaper, consumer-level equipment cannot cope.

Skipping proper RF planning is a significant gamble. The risk of a CEO’s microphone cutting out during a key announcement is not one worth taking.

Skipping the Soundcheck

The soundcheck is not optional; it is a critical part of the process. This is the dedicated time for the sound engineer to test every audio input and output, from the lectern microphone to the sound from a presentation laptop. It is the only opportunity to find and fix problems before the audience arrives.

Think of the soundcheck as your insurance policy against audio problems on the day. It is where we ensure every microphone is clear, every video plays with sound, and any chance of feedback is eliminated.

Insist on scheduling enough time for a full soundcheck, ideally with all presenters present. Even a quick five-minute check allows the engineer to tailor the microphone to a speaker's voice and ensures they feel confident. This simple step prevents the frantic, awkward scramble to fix low volume or feedback while a room full of delegates watches.

Your Conference Audio Hire Checklist

When it comes to conference audio, foresight helps prevent last-minute problems. A good checklist is your secret weapon, guiding you from selecting a supplier through to the post-event debrief.

Finding the Right Audio Partner

You need to secure your technical partner long before your event. This is not just about finding the cheapest quote; it is about finding a team with the right experience and a solid reputation. A low-cost supplier can quickly become an expensive mistake if the sound fails on the day.

When speaking with potential suppliers, ask specific questions.

• Venue Experience: Have they worked in your venue before? A team that already knows the room's acoustic dead spots, power limitations, or rigging points is invaluable.
• Track Record: Ask for examples of events they have handled that are similar in scale and style to yours. The right crew for a corporate AGM is different from a team that primarily works on music concerts.
• Safety and Insurance: This is essential. Ask for a copy of their Public Liability Insurance certificate and confirmation that their equipment is PAT tested. If they cannot provide this immediately, look elsewhere.

A great supplier acts as a partner, not just a vendor. A professional team, like London Audio Visual Hire, will ask about your agenda, presenters, and even the videos you plan to show. They build a solution with you, not just for you.

Nailing the Technical Details

With your supplier chosen, it is time to focus on the specifics. This is a collaborative process. You provide the vision and details of your event, and they translate that into a precise equipment list.

Your AV provider will need a solid brief. Be ready to provide:

• A final floor plan: This is crucial for determining speaker placement, cable runs, and the location of the mixing desk.
• A detailed schedule: This dictates crew call times, soundcheck slots, and the technical flow of the day.
• A list of every audio source: Consider everything that needs to make a sound, from presenter microphones and panel discussion setups to laptop audio for video playback and background music.

Overlooking these details is how preventable problems begin. The process below shows how a small oversight can escalate into a major issue.

As you can see, a simple error like choosing the wrong speaker for a conference room can lead directly to signal interference and leave no time for a proper soundcheck.

Example Audio Setups for London Venues

To give you a better idea of a typical setup, here are a few examples based on common London event spaces. These are starting points, but they should help you have a more informed conversation with your AV team.

These examples show how venue architecture and audience size directly influence the equipment needed to deliver clear, consistent sound.

On the Day and After the Event

On the event day, your main job is to clear the path for the technical team. They need the time and access to do their job properly.

• Stick to the Schedule: Ensure the AV crew can access the venue at the agreed time. Any delay will reduce crucial setup and testing time.
• Prioritise the Soundcheck: This is non-negotiable. Gather all presenters and ensure they are available for their soundcheck slot. It is the final, critical step to catch any issues.
• Hold a Quick Debrief: After the event, have a brief chat with your AV project manager. What worked well? What could be improved? Building a long-term relationship with a trusted supplier makes future events smoother.

Got Questions About Conference Speakers? We've Got Answers.

After years of setting up audio for conferences across London, we have encountered almost every question. Here are straightforward answers to some of the most common queries from event organisers.

How Far in Advance Should I Book an AV Provider for My Conference?

For a major conference in London, particularly during the busy periods of June, July, or September, our advice is to secure your AV partner three to six months in advance. This is not just about equipment availability; it is about securing the experienced technicians who know your chosen venue.

For a smaller event or one during a quieter period, one to two months' notice can be sufficient. However, booking earlier is always better. It allows more time for planning, site visits, and ensuring everything runs smoothly on the day.

What’s the Difference Between a Powered and a Passive Speaker?

A powered speaker (or active speaker) is an all-in-one unit with the amplifier built into the speaker box. This allows for a quicker and tidier setup, requiring only a signal cable and a power lead. For most corporate events, they are an efficient choice.

A passive speaker is more traditional and needs a separate, external amplifier. This adds an extra component to the setup, but for very large or complex events, it gives engineers more granular control over the system's power and sound characteristics.

Do I Need a Sound Engineer On-Site for My Event?

You absolutely need a sound engineer on-site if your event includes:

• More than two microphones running simultaneously.
• A panel discussion with several speakers.
• A mix of live presenters and audio from video clips.
• Any hybrid element with remote speakers.

A good engineer constantly manages audio levels, eliminates feedback, and resolves any issues like a microphone cutting out. For a simple speech with one lectern microphone, a technician for setup may be sufficient. But for any event with multiple moving parts, an engineer is your guarantee of a professional experience.

For a complex event, a sound engineer is not a luxury; they are an active insurance policy for the quality of your conference's audio. Their presence allows presenters and organisers to focus on the content, knowing the technical delivery is in expert hands.

How Do You Manage Audio for Hybrid Events?

Handling audio for a hybrid event requires creating two completely separate audio mixes.

The first is the in-room mix. This ensures everyone in the venue can hear both the presenters on stage and the speakers joining remotely through the main PA system.

The second, and more complex, is the online mix. This is a broadcast-quality feed sent to your virtual platform. We carefully balance this mix and use techniques like "mix-minus" to eliminate the echo and feedback that can ruin the experience for your remote audience and presenters.

Planning the audio for your next conference does not have to be a source of stress. The team at London Audio Visual Hire has the experience and equipment to ensure every word is heard with perfect clarity.

Contact us today to discuss your event requirements