Short answer: the Rythmik FV18, if you are buying new. The JTR Speakers Captivator S2 ranks higher than it (#9 vs #60 of 143 subwoofers, 4.5/5 vs 4.2/5) but is discontinued, so only consider it used; the Rythmik FV18 is still sold new at $2,670.
Why pick the JTR Speakers Captivator S2: A tall sealed subwoofer with two 18 inch drivers and serious deep bass output for demanding movies in a large room. The tradeoff: The 1016.0H x 533.4W x 457.2D mm cabinet and 220 lbs (99.8 kg) mass make this a serious placement and moving commitment.
Why pick the Rythmik FV18: An 18 inch ported subwoofer with deep, powerful bass for large rooms and flexible balanced and RCA inputs. The catch: The 838.2H x 533.4W x 558.8D mm cabinet and 160.1 lbs (72.6 kg) mass make this a serious placement and moving commitment.
Buy the Rythmik FV18, since the JTR Speakers Captivator S2 is discontinued and only worth hunting down used.
Still deciding? The full Subwoofers rankings cover every ranked option.
A tall sealed subwoofer with two 18 inch drivers and serious deep bass output for demanding movies in a large room.
An 18 inch ported subwoofer with deep, powerful bass for large rooms and flexible balanced and RCA inputs.
Prices on this page were last checked October 31, 2026 at 7:11 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 | Rythmik FV18 | |
|---|---|---|
| Price | $3,995 Discontinued | $2,670 |
| Ranked | #9 of 143 in Large Home Subwoofers (Over 75 lbs) | #60 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 | 102.0 dB |
| Output SPL at 15 Hz | 108.7 dB | 109.5 dB |
| Output SPL at 20 Hz | 115.1 dB | 114.3 dB |
| Output SPL at 25 Hz | 119.7 dB | 117.6 dB |
| Output SPL at 31.5 Hz | 124.8 dB | 119.2 dB |
| Output SPL at 40 Hz | 129.3 dB | 120.4 dB |
| Output SPL at 50 Hz | 130.3 dB | 121.3 dB |
| Output SPL at 63 Hz | 129.4 dB | 121.7 dB |
| Output SPL at 80 Hz | 128.5 dB | 121.9 dB |
| Output SPL at 100 Hz | 128.1 dB | 122.4 dB |
| Output SPL at 125 Hz | 128.0 dB | 121.9 dB |
| CEA-2010-A Average (40-80Hz) | 129.4 dB | 121.3 dB |
| Dimensions | 40”H x 21”W x 18”D (1016.0 x 533.4 x 457.2 mm) | 33”H x 21”W x 22”D (838.2 x 533.4 x 558.8 mm) |
| Weight | 220 lbs (99.8 kg) | 160.1 lbs (72.6 kg) |
| Warranty | 5/3 | 5/3 |
| Country | United States | United States |
| Measurement Source | Data-bass | Data-bass |
| Drivers | 2x 18” (457mm) drivers | 18” (457mm) driver |
| Inputs | XLR (balanced), RCA | XLR (2), RCA (line/LFE) |
| XLR Input | Yes | Yes |
| RCA Input | Yes | Yes |
| TRS Input | No | No |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | No |
| Cabinet Color | - | black |
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