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 Monoprice Monolith 10 THX Select ranks #127 (rated 3.6/5) and is discontinued, so it is only an option used. The Monoprice Monolith 10 THX Select’s replacement, the Monoprice Monolith M-10 V2, is rated 3.4/5 at $728.44.
The Monoprice SW-15 is the better-sounding pick. 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.
The case for the Monoprice Monolith 10 THX Select: A THX certified 10 inch ported subwoofer with a sturdy cabinet and balanced inputs, now discontinued. The tradeoff: The 10-inch gives up a lot of output to the 12 and 15-inch Monolith models, and the plain finish has no gloss black option.
Buy the Monoprice SW-15. It is rated higher for sound quality, and the Monoprice Monolith 10 THX Select is discontinued, so it is only available used.
Looking for alternatives? See the complete Subwoofers rankings.
A big 15 inch subwoofer with powerful, punchy bass at a budget price, great for movies in a large room.
A THX certified 10 inch ported subwoofer with a sturdy cabinet and balanced inputs, now discontinued.
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Specifications Side By Side
| Monoprice SW-15 | Monoprice Monolith 10 THX Select | |
|---|---|---|
| Price | $499.99 | $699 Discontinued |
| Ranked | #14 of 212 in Medium Home Subwoofers (30-75 lbs) | #127 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, bottom | ported, front |
| Output SPL at 15 Hz | 90.0 dB | 95.4 dB |
| Output SPL at 20 Hz | 101.2 dB | 102.6 dB |
| Output SPL at 25 Hz | 106.3 dB | 107.7 dB |
| Output SPL at 31.5 Hz | 111.2 dB | 109.0 dB |
| Output SPL at 40 Hz | 116.0 dB | 110.0 dB |
| Output SPL at 50 Hz | 120.2 dB | 112.0 dB |
| Output SPL at 63 Hz | 120.5 dB | 112.0 dB |
| Output SPL at 80 Hz | 119.5 dB | 112.0 dB |
| CEA-2010-A Average (40-80Hz) | 119.0 dB | 111.5 dB |
| Dimensions | 18.1”H x 21”W x 22.7”D (459.7 x 533.4 x 576.6 mm) | 18.9”H x 15”W x 19.7”D (480.1 x 381.0 x 500.4 mm) |
| Weight | 66.1 lbs (30.0 kg) | 72.5 lbs (32.9 kg) |
| Warranty | 1 | 5 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Audioholics | ErinsAudioCorner |
| Frequency Response | 30-150Hz (-10dB) | 17-20Hz |
| Amplifier Power | 600W RMS / 800W peak | 500W RMS |
| Crossover Frequency | 40-150Hz, 18dB/octave | - |
| Phase Control | 0° or 180° | - |
| Inputs | Stereo line level and speaker level | XLR, RCA, XLR passthrough out |
| Drivers | 15” (381mm) driver | 10” (254mm) driver |
| Output SPL at 100 Hz | - | 112.0 dB |
| Output SPL at 125 Hz | - | 111.0 dB |
| XLR Input | - | Yes |
| RCA Input | - | Yes |
| TRS Input | - | No |
| Optical Input | - | No |
| Coaxial Input | - | No |
| USB Input | - | No |
| HDMI Input | - | No |
| AES Input | - | No |
| Aux Input | - | No |
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