Short answer: the Monoprice SW-15. It ranks #14 of 212 subwoofers by sound quality (rated 4.1/5) at $499.99 and is still sold new; the Q Acoustics Q B12 ranks #68 (rated 3.8/5) and is discontinued, so it is only an option used. The Q Acoustics Q B12’s replacement, the Q Acoustics Q SUB120, is rated 3.8/5 at $1,399.
Why pick the Monoprice SW-15: A big 15 inch subwoofer with powerful, punchy bass at a budget price, great for movies in a large room. The tradeoff: Budget-tier design, ported room gain dependency, 66.1 lbs (30 kg) mid-size, and limited dynamic headroom.
What the Q Acoustics Q B12 does well: A sealed 12 inch subwoofer for music and movies that is easy to place in tricky rooms, now discontinued. The tradeoff: Rated response starts at 28Hz, and output falls to 95dB at 16Hz, so the deepest effects are limited.
Buy the Monoprice SW-15. It is rated higher for sound quality and still sold new, while the Q Acoustics Q B12 is discontinued.
Still deciding? The full Subwoofers rankings cover every ranked option.
A big 15 inch subwoofer with powerful, punchy bass at a budget price, great for movies in a large room.
A sealed 12 inch subwoofer for music and movies that is easy to place in tricky rooms, now discontinued.
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Specifications Side By Side
| Monoprice SW-15 | Q Acoustics Q B12 | |
|---|---|---|
| Price | $499.99 | $664.90 Discontinued |
| Ranked | #14 of 212 in Medium Home Subwoofers (30-75 lbs) | #68 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, bottom | sealed |
| Output SPL at 15 Hz | 90.0 dB | - |
| Output SPL at 20 Hz | 101.2 dB | 98.4 dB |
| Output SPL at 25 Hz | 106.3 dB | 104.9 dB |
| Output SPL at 31.5 Hz | 111.2 dB | 108.5 dB |
| Output SPL at 40 Hz | 116.0 dB | 111.4 dB |
| Output SPL at 50 Hz | 120.2 dB | 114.6 dB |
| Output SPL at 63 Hz | 120.5 dB | 117.1 dB |
| Output SPL at 80 Hz | 119.5 dB | 117.7 dB |
| CEA-2010-A Average (40-80Hz) | 119.0 dB | 115.2 dB |
| Dimensions | 18.1”H x 21”W x 22.7”D (459.7 x 533.4 x 576.6 mm) | 15.7”H x 15.7”W x 17.6”D (398.8 x 398.8 x 447.0 mm) |
| Weight | 66.1 lbs (30.0 kg) | 47.4 lbs (21.5 kg) |
| Warranty | 1 | 2 |
| Cabinet Color | black | black, white |
| Country | United States | United Kingdom |
| Measurement Source | Audioholics | Brent Butterworth |
| Frequency Response | 30-150Hz (-10dB) | 28-300Hz |
| Amplifier Power | 600W RMS / 800W peak | 220W RMS |
| Crossover Frequency | 40-150Hz, 18dB/octave | - |
| Phase Control | 0° or 180° | - |
| Inputs | Stereo line level and speaker level | - |
| Drivers | 15” (381mm) driver | 12” (305mm) driver |
| Output SPL at 16 Hz | - | 95.2 dB |
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