The small-room problem nobody warns you about
Small rooms have a bass problem and a reflection problem, and they need different solutions. A 9 or 12mm panel absorbs well above roughly 250 Hz. Below that, its performance falls away sharply, because low-frequency sound needs physical depth and an air gap to lose energy. So a wall of thin panels will clean up the flutter echo and make speech sound tight, while a 90 Hz room mode keeps booming underneath. That is normal, not a defective product.
Step 1: find the first reflection points
Sit in the mixing or speaking position. Have someone slide a mirror along the side wall - wherever you can see a monitor or the speaker's mouth in the mirror is a first reflection point. Treat those before the rest of the wall. On a typical project desk you will find three or four: left wall, right wall, ceiling above the desk, and the wall behind you.
Step 2: coverage plan for a 3 x 4 m room
- First reflection points: 4 panels of 600 x 1200mm, 20 to 30mm off the wall on battens.
- Back wall behind the listener: 3 to 4 panels, or a diffusing wood slat panel if the room sounds too dead.
- Corners, floor to ceiling: the highest-value real estate for bass. 100mm or thicker material if you intend to mix.
- Total: roughly 25 to 35 percent of the wall area in a small treated room.
Step 3: bass, honestly
You have three options. Buy genuinely thick absorber (100mm or more) and put it across corners. Add purpose-built bass traps. Or accept the limitation and use headphones for critical low-frequency decisions, treating the room for everything above 250 Hz. Option three is what most home studios actually do, and it is a perfectly professional choice.
Step 4: voice-over and podcast booths
For spoken word, absorption is almost the whole job, and you want it high and even: NRC 0.85 to 0.95 on all surfaces. The trap is over-treating. A fully dead booth sounds unnatural on a podcast and makes presenters push their voice. Leave one surface lightly reflective, or include a slat panel, and compare - see wood slat vs polyester panels for how each behaves.
Shopping list for a 3 x 4 m podcast room
- 10 x PET felt panels, 600 x 1200 x 12mm.
- 4 x 100mm corner absorbers, floor to ceiling.
- 1 x wood slat panel for the rear wall if the room feels dead.
- Battens to hold panels 20 to 30mm off the wall.
- A thick rug, and something soft on the desk - hard desks reflect straight up into the microphone.
Not sure how the numbers apply to your room? Send us the dimensions and we will mark up a layout. Request a studio quote, or start with what NRC actually tells you.