Conference and Corporate AV Sound: A Practical Guide
In the corporate AV world, sound is not about volume—it's about clarity, consistency, and connection. Whether you're equipping a boardroom, a large conference hall, or a hybrid event space, the goal is the same: every word must be intelligible, every participant heard, and every remote attendee fully engaged. This guide covers the fundamentals of speech intelligibility, distributed system design, and hybrid event audio, with insights from SSOUNDS engineering.
Key takeaways
- Prioritize speech intelligibility (STI >0.5) over raw SPL; clarity is the metric that matters.
- Use distributed loudspeaker systems for even coverage and to combat reverberation in large rooms.
- For hybrid events, implement a mix-minus feed and use microphones with tight pickup patterns to avoid feedback.
- Tune the system with a high-pass filter and presence boost; verify with measurement software.
- Choose networked audio (Dante/AES67) for scalability and remote management.
- SSOUNDS loudspeakers and DSP are engineered for precise coverage and speech optimization in corporate AV.
Why Speech Intelligibility Is Non-Negotiable
In corporate AV, the message is king. Poor sound quality leads to listener fatigue, miscommunication, and a diminished professional image. Speech intelligibility—measured by metrics like STI (Speech Transmission Index) or %ALcons—must be prioritized above all else. A system that sounds 'loud' but lacks clarity fails its purpose.
Key factors affecting intelligibility include reverberation time, direct-to-reverberant ratio, and frequency response. In typical conference rooms with hard surfaces, reverberation can smear consonants, making words like 'sixty' and 'sixteen' indistinguishable. SSOUNDS engineers address this by designing loudspeakers with controlled directivity and using DSP to optimize coverage and minimize reflections.
Distributed Systems: The Right Speaker for Every Space
For large conference halls, ballrooms, or multi-purpose corporate venues, a single central cluster often cannot provide uniform coverage without excessive SPL in the front and poor intelligibility in the rear. Distributed systems—multiple smaller loudspeakers placed strategically—offer consistent sound pressure and clarity across the entire audience area.
Ceiling-mounted loudspeakers are ideal for boardrooms and open-plan spaces, providing even coverage without visual intrusion. For larger rooms, low-profile column arrays or point-source cabinets can be wall-mounted or flown. SSOUNDS offers a range of compact, high-output enclosures designed for permanent installation, with beamwidth control to keep sound on the audience and off reflective surfaces.
When designing a distributed system, consider zoning: separate zones for the main audience, overflow areas, and translation booths. Each zone should have independent delay and EQ to align arrival times and compensate for room acoustics. SSOUNDS amplifiers with built-in DSP make zone management straightforward, allowing precise tuning from a single interface.
Hybrid Events: Bridging the Gap Between In-Room and Remote
Hybrid events add complexity: the audio system must serve both a live audience and remote participants via video conferencing platforms. The biggest challenge is acoustic echo cancellation (AEC) and feedback management. Microphones picking up loudspeaker output can cause howl-round or echo for remote attendees.
Best practices include using a separate mix for the far end: a 'mix-minus' that excludes the remote feed to avoid feedback. Ceiling microphones or gooseneck mics with tight pickup patterns reduce bleed. For the in-room audience, the PA must be tuned to avoid excessive SPL near microphones. SSOUNDS line arrays and point-source systems feature consistent off-axis response, making it easier to keep microphone zones clean.
Another critical element is latency. Video codecs and network transmission introduce delay; the audio system must align with the video signal to avoid lip-sync issues. SSOUNDS DSP allows adjustable delay per output, enabling precise synchronization with video feeds. For large hybrid setups, consider a dedicated audio network using Dante or AES67 for low-latency, deterministic transport.
System Design for Speech: Coverage, Level, and Tuning
Start with a coverage map. Use acoustic simulation software to predict SPL and STI across the seating area. Aim for an STI of 0.5 or higher for good intelligibility; 0.7+ is excellent. In reverberant rooms, distributed systems with multiple low-level sources outperform a single high-level source.
Level management is crucial. Corporate events rarely need 100 dB SPL; typical speech levels are 65–75 dB at the listener. Headroom of 10–15 dB is sufficient for peaks. Over-amplifying can cause feedback and listener discomfort. Use automatic gain control (AGC) or a dedicated speech processor to maintain consistent levels.
Tuning: apply a gentle high-pass filter at 80–100 Hz to reduce rumble and HVAC noise. A slight presence boost around 3–5 kHz improves consonant clarity. Avoid excessive low-frequency boost, which muddies speech. SSOUNDS loudspeakers come with factory presets optimized for speech, but room-specific EQ is essential. Use a measurement microphone and software like SMAART to verify response at multiple positions.
Microphone Selection and Placement
The microphone is the first link in the chain. For panel discussions and presentations, gooseneck or boundary microphones offer consistent pickup. For Q&A, wireless handheld or lavalier mics are standard. In hybrid scenarios, ceiling-mounted beamforming microphones (e.g., Shure MXA910) provide excellent coverage and built-in AEC.
Placement matters: keep microphones at least 1 meter from loudspeakers and avoid pointing them directly at the PA. Use a noise gate to mute mics when not in use, reducing ambient noise and potential feedback. SSOUNDS DSP includes ducking and gating functions that can be configured per input.
Future-Proofing with Networking and Scalability
Corporate AV systems should be scalable. Use a networked audio backbone (Dante, AVB, or AES67) to allow easy expansion. SSOUNDS amplifiers support Dante for digital audio transport, enabling centralized processing and monitoring. Plan for future needs: additional zones, overflow rooms, or integration with building management systems.
Remote monitoring and control are increasingly important. SSOUNDS amplifiers and DSP can be managed via software, allowing technicians to adjust levels, EQ, and delay from a tablet or laptop. This reduces the need for on-site staff during routine events.
Frequently asked
What is the ideal STI value for a conference room?
An STI of 0.5 is considered fair, 0.6 good, and 0.7 or higher excellent. For corporate AV, aim for at least 0.6 to ensure clear communication.
How many loudspeakers do I need for a distributed system?
It depends on room size, ceiling height, and coverage requirements. A typical rule is to space loudspeakers so that the coverage patterns overlap at the listener's ear height, with no more than 10–15 dB variation across the room. Simulation software can provide precise recommendations.
Can I use the same PA for both in-room and remote audio?
Yes, but careful mixing is required. Use a separate mix-minus feed for the remote codec, and ensure the in-room PA does not overload microphones. SSOUNDS DSP can create separate mixes for local and remote outputs.
What is the best microphone type for hybrid events?
Ceiling-mounted beamforming microphones (e.g., Shure MXA910) are excellent for hybrid events as they provide even pickup and built-in AEC. For tabletop use, gooseneck or boundary mics with cardioid patterns work well.
How do I reduce feedback in a conference room?
Keep microphones away from loudspeakers, use directional microphones, apply a noise gate, and tune the system with a feedback eliminator or careful EQ. SSOUNDS DSP includes notch filters and automatic feedback suppression.
Building or upgrading a system?
SSOUNDS engineers and manufactures professional PA worldwide — from a single room to stadium scale.