Short answer: the XTZ Sound 99 W12S, if you are buying new. The Monoprice Monolith M-15 V2 ranks higher than it (#71 vs #61 of 212 subwoofers, 4.2/5 vs 3.8/5) but is discontinued, so only consider it used; the XTZ Sound 99 W12S is still sold new at $1,499.
Buy the XTZ Sound 99 W12S new; the Monoprice Monolith M-15 V2 is no longer sold new, so it only makes sense as a used find.
Still deciding? The full Subwoofers rankings cover every ranked option.
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 | XTZ Sound 99 W12S | |
|---|---|---|
| Price | $1,500 Discontinued | $1,499 |
| Ranked | #71 of 143 in Large Home Subwoofers (Over 75 lbs) | #61 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, front | ported, rear |
| Output SPL at 12.5 Hz | 91.0 dB | - |
| Output SPL at 15 Hz | 106.3 dB | - |
| Output SPL at 20 Hz | 112.6 dB | 74.0 dB |
| Output SPL at 25 Hz | 116.6 dB | 86.5 dB |
| Output SPL at 31.5 Hz | 119.5 dB | 97.7 dB |
| Output SPL at 40 Hz | 120.9 dB | 108.3 dB |
| Output SPL at 50 Hz | 120.6 dB | 114.9 dB |
| Output SPL at 63 Hz | 120.0 dB | 117.3 dB |
| Output SPL at 80 Hz | 118.7 dB | 117.4 dB |
| Output SPL at 100 Hz | 120.1 dB | - |
| Output SPL at 125 Hz | 120.2 dB | - |
| CEA-2010-A Average (40-80Hz) | 120.0 dB | 114.5 dB |
| Dimensions | 28.7”H x 17.7”W x 26.8”D (729.0 x 449.6 x 680.7 mm) | 19.6”H x 13.8”W x 15.7”D (499.1 x 349.8 x 400.0 mm) |
| Weight | 132.9 lbs (60.3 kg) | 67.2 lbs (30.5 kg) |
| Warranty | 5 | - |
| Cabinet Color | black | - |
| Country | United States | Sweden |
| Measurement Source | Manufacturer | Ilkka Rissanen |
| Drivers | 15” (381mm) driver | 12” (305mm) 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 | - |
| Frequency Response | - | Not fully specified |
| Amplifier Power | - | Not fully specified |
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