Short answer: the JTR Speakers Captivator S2 for the higher ranking, the Monoprice Monolith M-15 V2 for the lower price. The JTR Speakers Captivator S2 ranks #7 of 97 subwoofers at $3995. The Monoprice Monolith M-15 V2 ranks #55 at $1500, $2495 cheaper.
Buy the JTR Speakers Captivator S2 if the ranking matters more than the price. Buy the Monoprice Monolith M-15 V2 if the price matters more than the ranking.
Specifications Side By Side
| JTR Speakers Captivator S2 | Monoprice Monolith M-15 V2 | |
|---|---|---|
| Price | $3995 | $1,500 |
| Ranked | #7 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #55 of 97 in Large Powered 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 | 91.0 dB |
| Output SPL at 15 Hz | 108.7 dB | 106.3 dB |
| Output SPL at 20 Hz | 115.1 dB | 112.6 dB |
| Output SPL at 25 Hz | 119.7 dB | 116.6 dB |
| Output SPL at 31.5 Hz | 124.8 dB | 119.5 dB |
| Output SPL at 40 Hz | 129.3 dB | 120.9 dB |
| Output SPL at 50 Hz | 130.3 dB | 120.6 dB |
| Output SPL at 63 Hz | 129.4 dB | 120.0 dB |
| Output SPL at 80 Hz | 128.5 dB | 118.7 dB |
| Output SPL at 100 Hz | 128.1 dB | 120.1 dB |
| Output SPL at 125 Hz | 128.0 dB | 120.2 dB |
| CEA-2010-A Average (40-80Hz) | 129.4 dB | 120.0 dB |
| Dimensions | 40.0"H x 21.0"W x 18.0"D (1016.0 x 533.4 x 457.2 mm) | 28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm) |
| Weight | 220 lbs / 99.8 kg | 132.9 lbs / 60.3 kg |
| Warranty | 5/3 | 5 |
| Country | United States | United States |
| Measurement Source | Data-bass | Manufacturer |
| Drivers | 2x 18" (457mm) drivers | 15" (381mm) driver |
| Cabinet Color | - | black |
The Two Speakers In Full
JTR Speakers Captivator S2: $3995
Notes: Replaced by “RS2”
| CEA-2010-A Average (40-80Hz) | 129.4 dB |
|---|---|
| Country | United States |
| Dimensions | 40.0"H x 21.0"W x 18.0"D (1016.0 x 533.4 x 457.2 mm) |
| Drivers | 2x 18" (457mm) drivers |
| Enclosure | sealed |
| Measurement Source | Data-bass |
| Output SPL at 10 Hz | 100.3 dB |
| Output SPL at 12.5 Hz | 103.3 dB |
| Output SPL at 15 Hz | 108.7 dB |
| Output SPL at 20 Hz | 115.1 dB |
| Output SPL at 25 Hz | 119.7 dB |
| Output SPL at 31.5 Hz | 124.8 dB |
| Output SPL at 40 Hz | 129.3 dB |
| Output SPL at 50 Hz | 130.3 dB |
| Output SPL at 63 Hz | 129.4 dB |
| Output SPL at 80 Hz | 128.5 dB |
| Output SPL at 100 Hz | 128.1 dB |
| Output SPL at 125 Hz | 128.0 dB |
| Warranty | 5/3 |
| Weight | 220 lbs / 99.8 kg |
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- Links
Monoprice Monolith M-15 V2: $1,500 Amazon
Notes: Product # 42851
| CEA-2010-A Average (40-80Hz) | 120.0 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | ported, front |
| Measurement Source | Manufacturer |
| 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 |
| Output SPL at 25 Hz | 116.6 dB |
| Output SPL at 31.5 Hz | 119.5 dB |
| Output SPL at 40 Hz | 120.9 dB |
| Output SPL at 50 Hz | 120.6 dB |
| Output SPL at 63 Hz | 120.0 dB |
| Output SPL at 80 Hz | 118.7 dB |
| Output SPL at 100 Hz | 120.1 dB |
| Output SPL at 125 Hz | 120.2 dB |
| Warranty | 5 |
| Weight | 132.9 lbs / 60.3 kg |
- Head-to-Head Comparisons
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- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.