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 MartinLogan Dynamo 600X ranks #171 (rated 3.4/5) and is discontinued, so it is only an option used.
The Monoprice SW-15 is the better-sounding choice. 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.
Why pick the MartinLogan Dynamo 600X: A 10 inch ported subwoofer with room correction and Bluetooth app control, made to blend with small speakers. The tradeoff: The 120W amplifier limits headroom, with an average of 108.9dB from 40 to 80Hz, so it struggles to fill a large room at high volume.
Buy the Monoprice SW-15. It is rated higher for sound quality; the MartinLogan Dynamo 600X is no longer sold new.
Want more options? Browse the full Subwoofers rankings.
A big 15 inch subwoofer with powerful, punchy bass at a budget price, great for movies in a large room.
A 10 inch ported subwoofer with room correction and Bluetooth app control, made to blend with small speakers.
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Specifications Side By Side
| Monoprice SW-15 | MartinLogan Dynamo 600X | |
|---|---|---|
| Price | $499.99 | $547.76 Discontinued |
| Ranked | #14 of 212 in Medium Home Subwoofers (30-75 lbs) | #171 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, bottom | ported, bottom |
| Output SPL at 15 Hz | 90.0 dB | - |
| Output SPL at 20 Hz | 101.2 dB | 95.7 dB |
| Output SPL at 25 Hz | 106.3 dB | 100.9 dB |
| Output SPL at 31.5 Hz | 111.2 dB | 103.6 dB |
| Output SPL at 40 Hz | 116.0 dB | 106.8 dB |
| Output SPL at 50 Hz | 120.2 dB | 109.3 dB |
| Output SPL at 63 Hz | 120.5 dB | 110.3 dB |
| Output SPL at 80 Hz | 119.5 dB | 109.3 dB |
| CEA-2010-A Average (40-80Hz) | 119.0 dB | 108.9 dB |
| Dimensions | 18.1”H x 21”W x 22.7”D (459.7 x 533.4 x 576.6 mm) | 16.3”H x 14.5”W x 14.9”D (414.0 x 368.3 x 378.5 mm) |
| Weight | 66.1 lbs (30.0 kg) | 35.5 lbs (16.1 kg) |
| Warranty | 1 | 3 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Audioholics | Audioholics |
| Frequency Response | 30-150Hz (-10dB) | 27-200Hz |
| Amplifier Power | 600W RMS / 800W peak | 120W 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 | - | 108.1 dB |
| Output SPL at 125 Hz | - | 106.9 dB |
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