Mixing in a bedroom and not trusting what you hear? Acoustic treatment fixes the room, not your speakers. Start with bass traps in the corners, then panels at the reflection points.
This guide is part of our home studio series and focuses on small rooms.
| Item | Starting point |
|---|---|
| Hard-surface coverage in a small studio | roughly 20-40% |
| Corner bass traps | at least the front two corners |
| Side-wall absorption | one panel on each side wall |
| Ceiling absorption | one cloud above the desk |
| Popular RT60 target for home studios | 0.3 seconds (disputed) |
These figures come from Violet Recording’s treatment guide (June 2026) and Acoustics Insider. They are rules of thumb from vendors and educators and can change, so check the sources before you rely on them.
What acoustic treatment actually does
In a small room, the walls, ceiling and floor are close to you and to your speakers. Sound bounces off them and arrives at your ears a split second after the direct sound, blurring what you hear. Acoustic treatment reduces and shapes those reflections so the mix you hear is closer to the mix you made.
It is not soundproofing. As Violet Recording puts it, adding panels won’t stop sound escaping or entering, which is a separate job.
Treatment also does not replace good gear, but it often changes a mix more than a new pair of speakers would. A room that exaggerates bass will make you cut low end that your mix needed, and the result sounds thin everywhere else.
Why bass is the first problem
Low frequencies have very long wavelengths, so small rooms handle them badly. Some notes boom and others vanish depending on where you sit. These patterns are called room modes, and they are strongest in rooms with parallel walls.
GIK Acoustics identifies bass control as a common challenge in small rooms. Bass trapping is therefore a useful starting point.
Thick, porous absorbers such as mineral wool do the work. Corners matter because bass pressure builds up where surfaces meet.
- Start with the front corners behind your speakers.
- Add the rear corners if budget allows.
- Consider wall-to-ceiling junctions as a later step.
Violet Recording suggests thick mineral wool traps in at least the front two corners, with more if you can. Broadband traps help the mids a little too, without making the room sound too dead, according to GIK Acoustics (GIK’s bass trap basics).
Find and treat the first reflection points
The first reflection points are the spots on the side walls and ceiling where sound from your speakers bounces once before reaching your ears. These early reflections smear the stereo image and cause comb filtering, a hollow, phasey tone.
Violet Recording’s starter package is one panel on each side wall, plus a ceiling cloud above the desk. Panels should be thick enough to absorb broadly, not thin foam.
Your speaker setup affects where these points land, so read our guide to studio monitor placement first and treat afterwards.
The mirror trick
- Sit in your mixing position.
- Have a friend slide a small mirror along the side wall.
- Mark every spot where you can see a speaker in the mirror.
- Repeat on the ceiling, using the mirror held flat.
- Place panels centred on those marks.
How much treatment is enough?
Violet Recording recommends broadband absorbers across roughly 20-40% of hard surfaces, supplemented by substantial corner treatment. That is a range, not a target. Rooms with carpet, curtains and bookshelves already have some absorption.
More is not always better. Treating only the highs leaves a room that is dead on top and boomy underneath. Aim for balance across the spectrum rather than the deadest possible room.
Skip the single RT60 number
RT60 is the time sound takes to decay by 60 dB. You will see advice to hit about 0.3 seconds in a home studio. Acoustics Insider argues that RT60 assumes a perfectly diffuse sound field, which small rooms can’t create.
Acoustics Insider recommends comparing decay across the spectrum instead of pursuing 0.3 seconds: controlling treble while leaving bass ringing produces an uneven result.
Diffusion, rugs and low-cost options
Once absorption is in place, you may add some diffusion. GIK Acoustics says diffusers usually go on the back wall or near the tracking area, and that they help with comb filtering, flutter and slap echo.
In very small rooms, diffusers need distance to work, so absorption usually gives better results first.
- Rugs and curtains: help the highs, do little for bass.
- Bookshelves: irregular surfaces scatter some sound.
- DIY panels: mineral wool or rigid fibreglass in a wooden frame with breathable fabric.
- Sofas and mattresses: a cheap temporary absorber when leaned on a corner.
Thin foam tiles are the usual trap here. They absorb only high frequencies, so they make the room sound dull without fixing the boom.
Common mistakes in small rooms
Most disappointing results come from a handful of habits. Knowing them saves money before you buy anything.
- Covering the walls evenly: panels placed at random do less than the same panels placed at reflection points and corners.
- Treating only the front wall: the rear wall reflects bass back at you, so the space behind your head matters too.
- Using thin material: thickness decides how low an absorber works, so thin panels leave the bass untouched.
- Ignoring the desk: a large hard desk is a reflective surface right under your speakers, so keep it clear and tidy.
- Buying everything at once: add a little, listen, then decide what the room still needs.
If your budget is tight, put the money into thick corner traps before anything else. You can add panels later as you assess what the room still needs.
Finally, your listening position matters as much as the treatment. Sitting in the exact middle of the room often lands you on a bass null, so small shifts forward or back can improve the low end before you spend anything at all.
Test, listen and adjust
Treat in stages and listen after each one. Play a track you know well, and notice whether the bass is even, whether the stereo image is clearer and whether vocals sit steadily in the centre. A clap in the room also shows how long reflections linger.
A measurement microphone and free software can confirm what you hear, but trust your ears for the final call. If you mix on cans as well, the studio headphones guide covers a good cross-check, since headphones skip the room entirely.
Whatever you decide, compare your mixes on several systems. A treated room gives you a reliable reference, and translation checks prove it.
Frequently asked questions
Does acoustic treatment soundproof my room?
Show answer
No. Violet Recording notes that adding panels won’t stop sound escaping or entering. Soundproofing needs mass and sealing, which is a different job.
What should I treat first?
Show answer
Corners for bass, then the side-wall and ceiling reflection points, which matches the order in Violet Recording’s starter package.
Is foam enough?
Show answer
Thin foam mainly absorbs high frequencies. Thick mineral wool or similar broadband absorbers are better for bass and mids.
Do I need to hit an RT60 of 0.3 seconds?
Show answer
Acoustics Insider says to forget the 0.3-second target and aim for balanced decay across all frequencies.
