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“What size subwoofer do I need for my room?” is the question we get asked most. Room size is the single best guide, but it’s not the only one: whether the room is open to other spaces, what you listen to, and how loud you like it all play a part. Here’s a simple chart and how to adjust it for your situation.
Subwoofer size by room size
| Room size | Approx. dimensions | Suggested sub | Example picks |
|---|---|---|---|
| Under 150 sq ft (14 m²) | 10 × 12 ft bedroom, office | 6.5–8 inch, sealed | Kanto SUB6, KEF Kube 8 MIE |
| 150–250 sq ft (14–23 m²) | 12 × 16 ft living room | 8–10 inch | Yamaha NS-SW100, Klipsch R-100SW |
| 250–400 sq ft (23–37 m²) | 15 × 20 ft living room | 10–12 inch | SVS SB-1000 Pro, Klipsch R-120SW |
| 400–600 sq ft (37–56 m²) | Large or open plan | 12-inch ported or two subs | SVS PB-1000 Pro, PB-2000 Pro |
| 600 sq ft+ / dedicated theater | Big rooms | 13–15 inch, or two to four subs | SVS PB-3000 R|Evolution, Klipsch RP-1400SW |
Adjust up a size if…
- The room opens onto a kitchen, hallway or stairs (bass fills the whole connected volume).
- You watch lots of action films or listen loud.
- Your ceiling is high (over about 10 ft).
- You choose a sealed design and want film-level output.
Adjust down a size if…
- You live in an apartment or share walls. See apartment subwoofers.
- You mainly listen to music at moderate levels.
- The room is small and enclosed: small rooms add a lot of bass gain of their own.
Why room volume matters
A sub has to pressurise the air in the room. Double the room volume and it needs roughly twice the output (about 3 dB more) to reach the same level. Small, closed rooms also add “room gain” below a certain frequency, which is why a modest sub can sound surprisingly deep in a bedroom.
Driver size isn’t the whole story
A well-engineered 10-inch with a strong amplifier can outperform a cheap 12-inch, and a ported 12-inch plays louder in the deep bass than a sealed 12-inch. Use this chart as a starting point, then read ported vs sealed and our buying guide to finish the decision.
When two subs beat one bigger sub
In large rooms with several seats, two medium subs usually give smoother bass than one big sub. See how many subwoofers you need.