Short answer: both are discontinued, so this only matters if you are buying used. Used, the Monoprice Monolith M-15 V2 is the better pick: it ranks #71 of 143 subwoofers by sound quality (rated 4.2/5), against #88 (rated 4.1/5) for the Monoprice Monolith M15-S. If you want one new, the Monoprice Monolith M-215 ranks #24 at $1,499.99.
Buy the Monoprice Monolith M-15 V2 only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, start with the Monoprice Monolith M-215 instead.
Looking for alternatives? See the complete Subwoofers rankings.
Prices on this page were last checked November 7, 2026 at 7:34 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| Monoprice Monolith M-15 V2 | Monoprice Monolith M15-S | |
|---|---|---|
| Price | $1,500 Discontinued | $999 Discontinued |
| Ranked | #71 of 143 in Large Home Subwoofers (Over 75 lbs) | #88 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | sealed |
| Output SPL at 12.5 Hz | 91.0 dB | - |
| Output SPL at 15 Hz | 106.3 dB | 100.1 dB |
| Output SPL at 20 Hz | 112.6 dB | 105.6 dB |
| Output SPL at 25 Hz | 116.6 dB | 111.2 dB |
| Output SPL at 31.5 Hz | 119.5 dB | 115.2 dB |
| Output SPL at 40 Hz | 120.9 dB | 118.4 dB |
| Output SPL at 50 Hz | 120.6 dB | 119.3 dB |
| Output SPL at 63 Hz | 120.0 dB | 119.6 dB |
| Output SPL at 80 Hz | 118.7 dB | 118.9 dB |
| Output SPL at 100 Hz | 120.1 dB | 119.1 dB |
| Output SPL at 125 Hz | 120.2 dB | 118.9 dB |
| CEA-2010-A Average (40-80Hz) | 120.0 dB | 119.0 dB |
| Dimensions | 28.7”H x 17.7”W x 26.8”D (729.0 x 449.6 x 680.7 mm) | 23.5”H x 16.7”W x 19.7”D (596.9 x 424.2 x 500.4 mm) |
| Weight | 132.9 lbs (60.3 kg) | 80 lbs (36.3 kg) |
| Warranty | 5 | 5 |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Manufacturer | Manufacturer |
| Drivers | 15” (381mm) driver | 15” (381mm) driver |
| Inputs | XLR, RCA | - |
| 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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