Treating a Studio Room or Building a Room Within It

When a studio sounds boomy or picks up corridor noise, the conversation usually narrows to two options. The first is to treat the room you already have: absorb reflections, damp the hard surfaces and seal the obvious leaks. The second is to build a smaller isolated space inside the existing room, a floating booth or box-in-box shell that takes the desk and presenters out of the problem altogether.

Both can produce clean dialogue, and both are sold with confidence. What gets lost is that they solve different problems. Treatment controls how a room sounds from the inside. A room within a room controls what gets in and out. Many studios buy one when they needed the other, and then spend a second budget correcting it.

In this note I compare the two as I would across a table with a studio manager, using the measurements we take before anyone orders a single panel. I finish with a recommendation, and with the cases where I would reverse it.

Treatment starts with measurement. We record the reverberation time across the speech range, listen for flutter echo between parallel walls, and note where the desk sits relative to hard glass and bare floor. The usual remedies are broadband absorption at first reflection points, bass trapping in corners, a heavier ceiling cloud over the presenters and a rug or acoustic flooring under the set.

The strength of this route is that it is quick and contained. Panels can be fitted between programmes, the set stays where it is and camera positions and lighting are barely disturbed. It also cures the most common complaint, a roomy, echoing sound that makes lavalier and boom microphones pick up the space rather than the voice.

Its limit is that absorption does very little against noise arriving through walls, doors and ductwork. You can make a room dry and still hear a lift, a forklift or the studio next door behind every pause in speech.

• Reverberation measured before and after, so the result is a number
• Fitted between programmes with little disturbance to the set
• Does not stop external noise from passing through walls and doors

An isolated booth is a structure with its own floor, walls and ceiling, decoupled from the surrounding building on resilient mounts. Done properly it gives real separation from outside noise, and it gives you a small, controlled volume that is easier to treat well than a large hall.

The price is paid in space, time and complexity. The shell takes floor area, needs ventilation that does not become a noise path, and has to coexist with lighting grids, cable routes and camera movement. A single camera on a pedestal can feel boxed in, and a three-camera interview format may not fit at all without losing the shots the director wants.

Build time is measured in weeks rather than days, and the studio is usually out of use for part of it. If the room is shared or leased, permission and reinstatement also enter the conversation. These are manageable, but they should be known before the decision, not after the quote.

In the studios we survey, the two problems are rarely equal. A handful have a genuine noise-intrusion problem, with a level of background sound that no amount of absorption will hide. Far more have a room that is simply too live, where reflections smear consonants and make editors reach for noise reduction that then dulls the voice.

We separate the two with a simple test: quiet-room noise level taken at the presenter position, with the gallery and air handling running as they would during a broadcast. If that figure is acceptable and the reverberation is long, treatment is the answer. If the figure is high and the source is structural, isolation earns its cost.

Often the honest finding is a mixture. A moderate treatment scheme, plus sealed doors and a quieter air supply, lands most studios in an acceptable place without building anything new.

• Quiet-room noise level taken with air handling running
• Reverberation time across the speech range
• A short listening walk for flutter echo and rattles

For a typical news or interview studio, treatment is the smaller commitment in money and in downtime. It can be phased, starting with the surfaces nearest the presenters and extending only if the measurements say more is needed. That staging matters for a channel that cannot afford to go dark.

A room within a room is a capital project. It needs design, structural checks, services routing and a commissioning period, and it fixes the layout of the studio for years. That is fine when the layout is settled and the format is stable, and awkward when programmes change shape every season.

Whichever route is chosen, we re-measure on completion and compare against the starting figures. A result you can read off a page is more useful than a promise, and it gives the next person who manages the studio something solid to work from.

For most live television studios, start with treatment. It is cheaper, faster, reversible in part, and it addresses the problem that actually spoils most dialogue, which is reflection within the room. Pair it with door seals, a look at the air supply and a sensible microphone technique, and re-measure before deciding anything bigger.

Choose the room within a room only when measured background noise is the real fault and cannot be reduced at source, or when the studio shares a building with something loud that you do not control. In that case, accept the loss of floor space and plan the camera layout around it from the first drawing.

If you are unsure which situation you are in, the cheapest step is the measurement itself. It tells you whether you are buying absorption, isolation or neither, and it stops a budget being spent on the wrong cure.