If people on the other end of your conference calls are constantly asking you to repeat yourself, or if in-person meetings feel like everyone is talking into a concrete tunnel, the room is the problem — not your microphone or your speaker.

Conference rooms are among the worst acoustic environments in most buildings. Hard surfaces everywhere, rectangular geometry, glass walls, and no soft furnishings. They're designed for meetings, not for sound. Here's how to fix them.

What's the Quick Answer?

Most conference room audio problems come from two sources: too much echo (reverb from hard surfaces) and microphone placement that's too far from the speakers. Fix the echo with surface treatment, fix the microphone problem by getting microphones closer to people. Everything else is secondary.

Why Do Conference Rooms Sound So Bad?

A typical conference room has:

• A glass wall or large windows — almost perfectly reflective
• A bare table surface — large, flat, and reflective
• Hard floor — tile or carpet tile, not absorptive carpet
• Drywall or painted plaster walls — moderately reflective
• Low ceiling with acoustic tiles — the one saving grace, but not enough on its own

Every one of these surfaces reflects sound. When you speak, your voice bounces off the table, the windows, the walls, and the ceiling before it reaches a microphone or another person's ears. The microphone captures all of those reflections along with your voice — which is why you sound echoey and distant on calls, and why people in the room struggle to understand each other during presentations.

The technical measure of this is RT60 — the time it takes for sound to decay 60 dB after a sound source stops. A well-designed conference room has RT60 of 0.4–0.6 seconds. Most untreated rooms measure 0.8–1.5 seconds. The longer the reverb, the worse speech intelligibility becomes.

Fix 1: Address the Table — Your Biggest Reflector

The conference table is typically the largest hard reflective surface in the room, and it sits directly between people and microphones.

Add a large table runner or felt pad. A thick felt table runner running the length of the table costs almost nothing and noticeably reduces the strong table reflection that microphones pick up. It's the highest-return, lowest-cost treatment in most conference rooms.

Consider a fabric tablecloth for important calls. Not a permanent solution, but a thick tablecloth transforms the table from a reflective surface to an absorptive one. The difference in call clarity is measurable.

Fix 2: Treat the Glass Wall

Glass is one of the most reflective surfaces in any room. A full-height glass wall in a conference room creates flutter echo — a rapid back-and-forth reflection between the glass and the opposite wall — that makes voice recordings sound hollow and digital calls sound echoey.

Heavy curtains or blinds that cover the glass during meetings are the simplest fix. Closed blinds reduce glass reflections significantly. Floor-to-ceiling curtains with extra fabric (allowing them to gather in folds) perform even better.

If the glass wall is internal and removing it isn't an option, acoustic film or fabric panels mounted on the glass can reduce reflections, though with less effectiveness than curtains.

Fix 3: Add Panels to the Side Walls

The most impactful permanent treatment for a conference room is acoustic panels on the side walls at the midpoint of the table.

These panels address first reflections — the sound that bounces off the walls and arrives at microphones and ears a few milliseconds after the direct sound. First reflections cause comb filtering (certain frequencies cancel out) and contribute to the echoey quality that makes long calls fatiguing.

Where to place them: On each long wall, roughly centered on the length of the table. Height should be between 1–2.5 m — the zone where sound from standing presenters and seated attendees bounces off the walls toward the table center.

Size: Each panel should be at least 60×90 cm. Two panels per side wall (four total) is a meaningful improvement. More is better up to about 25% of total wall surface.

DIY option: Rigid mineral wool (Rockwool/Rockboard 60 or equivalent, at least 5 cm thick) wrapped in fabric and mounted on the wall performs comparably to purpose-built acoustic panels at roughly 30–40% of the cost.

Fix 4: Fix the Microphone Placement

This is the most overlooked fix in corporate AV. Microphone placement has more impact on call clarity than any acoustic treatment you can add.

The fundamental rule: The microphone should be as close to the speaker's mouth as practical. Every time you double the distance between a speaker and a microphone, you pick up four times as much room noise relative to the voice.

A microphone 60 cm from a person's mouth captures a clean voice. A microphone 180 cm away (a common table mic in the center of a large table) captures the voice mixed with significant room reverb — and that reverb is what makes remote participants struggle.

What this means for table mics:

• In a room seating 6–8 people, one mic at the center of the table works adequately
• In rooms seating 10+, use two table mics spaced along the table, or a ceiling mic array
• For videoconferencing, a ceiling mic array (Biamp, Shure, Sennheiser) provides better coverage than a single table unit in large rooms
• Directional boundary mics (cardioid or supercardioid pattern) reject room reflections better than omnidirectional models

Avoid: Placing microphones directly on reflective surfaces without a desk pad underneath. Reflections from the table enter the mic capsule and worsen clarity.

Fix 5: Control the Speaker Position

In a conference room with installed ceiling or surface-mounted speakers, placement mistakes are common.

Speakers should point at people, not at walls or the ceiling. A speaker mounted flat on the ceiling firing straight down often misses seated listeners — the acoustic energy goes to the floor, not to the listening position at ear height. Angled ceiling speakers that aim at the seating area perform better.

Volume should be as low as possible while maintaining intelligibility. Louder speakers excite room reverb more. The goal isn't to overpower the room — it's to deliver enough direct sound that the room reverb is a background artifact rather than the dominant sound. Use the speaker placement tool to check speaker coverage and angles for your room dimensions.

Speaker-to-mic distance matters. In rooms with installed speakers and table microphones, the speakers should be positioned so that they're not in the direct pickup pattern of the microphones. A speaker firing directly into an open microphone at high level causes feedback and forces gain reduction, which reduces clarity for remote participants.

Fix 6: Low-Cost Items That Actually Help

In order of impact per dollar:

| Treatment | Cost | Impact | |-----------|------|--------| | Felt table runner | $15–$30 | High — reduces the room's largest reflector | | Thick curtains on glass wall | $40–$100 | High — eliminates flutter echo | | Area rug (if hard floor) | $50–$150 | Medium — floor bounce reduction | | Acoustic panels (×4, side walls) | $200–$400 | High — addresses first reflections | | Better table microphone | $100–$300 | High — close-mic'ing beats room treatment | | Ceiling tiles upgrade | $300–$600 | Medium — already doing some work |

If budget is limited, start with the table runner and the microphone. If you can only do one thing, fix the microphone position.

What Does a Well-Treated Room Actually Sound Like?

In a properly treated conference room (RT60 of 0.4–0.6 seconds, good microphone placement):

• Remote participants understand speech without asking for repeats
• Presentations don't produce distracting echoes
• Side conversations don't bleed into the microphone as much
• Long calls are less fatiguing — both in the room and for remote participants

The goal isn't a dead room. Some reverb is natural and acceptable. The goal is a room where your voice is the loudest thing the microphone hears, not the room itself.

The Underlying Principle

Every fix in this guide does one of two things: reduces the room's contribution to the microphone signal, or moves the microphone closer to the voice. Both reduce the ratio of room sound to direct sound.

That ratio — direct sound to reverberant sound — is what determines speech clarity. Fix the ratio and the room works. For a broader understanding of room acoustics and how surface materials affect sound, see our complete guide to speaker placement and the overview of room acoustics basics.