Short answer: the Monoprice Monolith M-215, if you are buying new. The JTR Speakers Captivator S2 ranks higher than it (#9 vs #24 of 143 subwoofers, 4.5/5 vs 4.4/5) but is discontinued, so only consider it used; the Monoprice Monolith M-215 is still sold new at $1,499.99.
Buy the Monoprice Monolith M-215 new; the JTR Speakers Captivator S2 is no longer sold new, so it only makes sense as a used find.
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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
| JTR Speakers Captivator S2 | Monoprice Monolith M-215 | |
|---|---|---|
| Price | $3,995 Discontinued | $1,499.99 |
| Ranked | #9 of 143 in Large Home Subwoofers (Over 75 lbs) | #24 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, front |
| Output SPL at 10 Hz | 100.3 dB | - |
| Output SPL at 12.5 Hz | 103.3 dB | 103.9 dB |
| Output SPL at 15 Hz | 108.7 dB | 113.1 dB |
| Output SPL at 20 Hz | 115.1 dB | 118.9 dB |
| Output SPL at 25 Hz | 119.7 dB | 122.6 dB |
| Output SPL at 31.5 Hz | 124.8 dB | 125.2 dB |
| Output SPL at 40 Hz | 129.3 dB | 126.4 dB |
| Output SPL at 50 Hz | 130.3 dB | 126.1 dB |
| Output SPL at 63 Hz | 129.4 dB | 125.6 dB |
| Output SPL at 80 Hz | 128.5 dB | 125.6 dB |
| Output SPL at 100 Hz | 128.1 dB | 125.7 dB |
| Output SPL at 125 Hz | 128.0 dB | 126.3 dB |
| CEA-2010-A Average (40-80Hz) | 129.4 dB | 125.9 dB |
| Dimensions | 40”H x 21”W x 18”D (1016.0 x 533.4 x 457.2 mm) | 42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm) |
| Weight | 220 lbs (99.8 kg) | 216.1 lbs (98.0 kg) |
| Warranty | 5/3 | 5 |
| Country | United States | United States |
| Measurement Source | Data-bass | Brent Butterworth |
| Drivers | 2x 18” (457mm) drivers | 2x 15” (381mm) drivers |
| Inputs | XLR (balanced), 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 | - |
| Cabinet Color | - | black |
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