Short answer: the Monoprice Monolith M-215. It ranks #24 of 143 subwoofers by sound quality (rated 4.4/5) at $2,999.99 and is still sold new; the JTR Speakers Captivator 1400 ranks #30 (rated 4.3/5) and is discontinued, so it is only an option used.
Why pick the JTR Speakers Captivator 1400: A low, wide 18 inch ported subwoofer with strong deep bass for movies, easy to tuck under a screen or riser. The tradeoff: The 508.0H x 762.0W x 571.5D mm cabinet and 142 lbs (64.4 kg) mass make this a serious placement and moving commitment.
What the Monoprice Monolith M-215 does well: A dual 15 inch ported subwoofer with excellent output down to the lowest notes, a strong value for large home theaters. Watch for: The 1074.4H x 508.0W x 701.0D mm cabinet and 216.1 lbs (98.0 kg) mass make this a serious placement and moving commitment.
Buy the Monoprice Monolith M-215. It is rated higher for sound quality, and the JTR Speakers Captivator 1400 is discontinued, so it is only available used.
Still deciding? The full Subwoofers rankings cover every ranked option.
A low, wide 18 inch ported subwoofer with strong deep bass for movies, easy to tuck under a screen or riser.
A dual 15 inch ported subwoofer with excellent output down to the lowest notes, a strong value for large home theaters.
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 1400 | Monoprice Monolith M-215 | |
|---|---|---|
| Price | $2,495 Discontinued | $2999.99 |
| Ranked | #30 of 143 in Large Home Subwoofers (Over 75 lbs) | #24 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Output SPL at 12.5 Hz | 99.3 dB | 103.9 dB |
| Output SPL at 15 Hz | 111.9 dB | 113.1 dB |
| Output SPL at 20 Hz | 116.1 dB | 118.9 dB |
| Output SPL at 25 Hz | 119.2 dB | 122.6 dB |
| Output SPL at 31.5 Hz | 121.7 dB | 125.2 dB |
| Output SPL at 40 Hz | 124.8 dB | 126.4 dB |
| Output SPL at 50 Hz | 126.4 dB | 126.1 dB |
| Output SPL at 63 Hz | 125.4 dB | 125.6 dB |
| Output SPL at 80 Hz | 124.0 dB | 125.6 dB |
| Output SPL at 100 Hz | 126.0 dB | 125.7 dB |
| Output SPL at 125 Hz | 124.7 dB | 126.3 dB |
| CEA-2010-A Average (40-80Hz) | 125.2 dB | 125.9 dB |
| Dimensions | 20”H x 30”W x 22.5”D (508.0 x 762.0 x 571.5 mm) | 42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm) |
| Weight | 142 lbs (64.4 kg) | 216.1 lbs (98.0 kg) |
| Warranty | 5/3 | 5 |
| Country | United States | United States |
| Measurement Source | Data-bass | Brent Butterworth |
| Drivers | 18” (457mm) driver | 2x 15” (381mm) drivers |
| 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 | - |
| Cabinet Color | - | black |
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