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 JBL SUB 550P ranks #206 (rated 2.9/5) and is discontinued, so it is only an option used.
The Monoprice SW-15 is the better-sounding option. A big 15 inch subwoofer with powerful, punchy bass at a budget price, great for movies in a large room. The catch: Budget-tier design, ported room gain dependency, 66.1 lbs (30 kg) mid-size, and limited dynamic headroom.
Why pick the JBL SUB 550P: A discontinued sealed 10 inch subwoofer with a 300 watt amp, multiple line inputs and an adjustable crossover. Watch for: Bass is strong to about 30Hz but 10dB down there against the 60 to 80Hz range.
Buy the Monoprice SW-15. It is rated higher for sound quality and still sold new, while the JBL SUB 550P 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 discontinued sealed 10 inch subwoofer with a 300 watt amp, multiple line inputs and an adjustable crossover.
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Specifications Side By Side
| Monoprice SW-15 | JBL SUB 550P | |
|---|---|---|
| Price | $499.99 | $600 Discontinued |
| Ranked | #14 of 212 in Medium Home Subwoofers (30-75 lbs) | #206 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 | 84.7 dB |
| Output SPL at 25 Hz | 106.3 dB | 89.8 dB |
| Output SPL at 31.5 Hz | 111.2 dB | 98.1 dB |
| Output SPL at 40 Hz | 116.0 dB | 101.5 dB |
| Output SPL at 50 Hz | 120.2 dB | 103.2 dB |
| Output SPL at 63 Hz | 120.5 dB | 103.3 dB |
| Output SPL at 80 Hz | 119.5 dB | 103.7 dB |
| CEA-2010-A Average (40-80Hz) | 119.0 dB | 102.9 dB |
| Dimensions | 18.1”H x 21”W x 22.7”D (459.7 x 533.4 x 576.6 mm) | 17.5”H x 14.9”W x 15”D (444 x 379 x 380 mm) |
| Weight | 66.1 lbs (30.0 kg) | 50 lbs (22.7 kg) |
| Warranty | 1 | 1 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Audioholics | ErinsAudioCorner |
| Frequency Response | 30-150Hz (-10dB) | 27-150Hz |
| Amplifier Power | 600W RMS / 800W peak | 300W RMS |
| Crossover Frequency | 40-150Hz, 18dB/octave | - |
| Phase Control | 0° or 180° | - |
| Inputs | Stereo line level and speaker level | - |
| Drivers | 15” (381mm) driver | 10” (254mm) driver |
| Output SPL at 100 Hz | - | 104.2 dB |
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