Short answer: the Paradigm Defiance X15. It ranks #29 of 97 subwoofers by sound quality at $1606.77; the JTR Speakers Captivator 118HT ranks #30 and costs $1995, so there is little reason to consider the other one.
What the JTR Speakers Captivator 118HT offers: Independent CEA-2010 testing records 112.6 dB at 20 Hz and 122.8 dB through 40-80 Hz. The ported, front enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room. Watch for: The 762.0H x 508.0W x 571.5D mm cabinet and 58.5 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.
What the Paradigm Defiance X15 offers: Independent CEA-2010 testing records 109.2 dB at 20 Hz and 122.9 dB through 40-80 Hz. The ported, bottom enclosure with 15” (381mm) driver has the headroom for demanding film bass in a large room. Watch for: The 625.3H x 588.8W x 625.3D mm cabinet and 41.7 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.
Buy the Paradigm Defiance X15. It ranks higher for sound quality than the JTR Speakers Captivator 118HT and costs less, which settles it without a real tradeoff to make.
Specifications Side By Side
| JTR Speakers Captivator 118HT | Paradigm Defiance X15 | |
|---|---|---|
| Price | $1995 | $1,606.77 |
| Ranked | #30 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #29 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, bottom |
| Output SPL at 15 Hz | 108.7 dB | 102.8 dB |
| Output SPL at 20 Hz | 112.6 dB | 109.2 dB |
| Output SPL at 25 Hz | 114.8 dB | 112.2 dB |
| Output SPL at 31.5 Hz | 116.6 dB | 116.2 dB |
| Output SPL at 40 Hz | 119.3 dB | 121.3 dB |
| Output SPL at 50 Hz | 122.3 dB | 123.4 dB |
| Output SPL at 63 Hz | 124.6 dB | 123.8 dB |
| Output SPL at 80 Hz | 125.2 dB | 123.1 dB |
| Output SPL at 100 Hz | 125.1 dB | 121.9 dB |
| Output SPL at 125 Hz | 125.4 dB | 121.2 dB |
| CEA-2010-A Average (40-80Hz) | 122.8 dB | 122.9 dB |
| Dimensions | 30"H x 20"W x 22.5"D (762.0 x 508.0 x 571.5 mm) | 24.6"H x 23.2"W x 24.6"D (625.3 x 588.8 x 625.3 mm) |
| Weight | 129 lbs / 58.5 kg | 91.9 lbs / 41.7 kg |
| Warranty | 5/3 | 3 |
| Country | United States | Canada |
| Measurement Source | Data-bass | Audioholics |
| Drivers | 18" (457mm) driver | 15" (381mm) driver |
| Cabinet Color | - | black |
Related Speaker Comparisons
A few more comparisons worth a look in the same class:
- Funk Audio Classic 21.0L vs JTR Speakers Captivator 2400ULF
- Harbinger V2218S vs JTR Speakers Captivator 2400ULF
- Perlisten Audio D215s vs RTJ Audio 18Sub
- MartinLogan Dynamo 1600X vs Paradigm Defiance X15
- Power Sound Audio (PSA) XV30FSE vs Elemental Designs A7S-450
Prices on this page were last checked September 8, 2026 at 6:02 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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The Two Speakers In Full
JTR Speakers Captivator 118HT: $1995 eBay
Pros: Independent CEA-2010 testing records 112.6 dB at 20 Hz and 122.8 dB through 40-80 Hz. The ported, front enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room.
Cons: The 762.0H x 508.0W x 571.5D mm cabinet and 58.5 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.
Full JTR Speakers Captivator 118HT review and specifications →
| CEA-2010-A Average (40-80Hz) | 122.8 dB |
|---|---|
| Country | United States |
| Dimensions | 30"H x 20"W x 22.5"D (762.0 x 508.0 x 571.5 mm) |
| Drivers | 18" (457mm) driver |
| Enclosure | ported, front |
| Measurement Source | Data-bass |
| Output SPL at 15 Hz | 108.7 dB |
| Output SPL at 20 Hz | 112.6 dB |
| Output SPL at 25 Hz | 114.8 dB |
| Output SPL at 31.5 Hz | 116.6 dB |
| Output SPL at 40 Hz | 119.3 dB |
| Output SPL at 50 Hz | 122.3 dB |
| Output SPL at 63 Hz | 124.6 dB |
| Output SPL at 80 Hz | 125.2 dB |
| Output SPL at 100 Hz | 125.1 dB |
| Output SPL at 125 Hz | 125.4 dB |
| Warranty | 5/3 |
| Weight | 129 lbs / 58.5 kg |
- Links
- Reviews, Comparisons and Sound Samples
Paradigm Defiance X15: $1,606.77 eBay
Pros: Independent CEA-2010 testing records 109.2 dB at 20 Hz and 122.9 dB through 40-80 Hz. The ported, bottom enclosure with 15” (381mm) driver has the headroom for demanding film bass in a large room.
Cons: The 625.3H x 588.8W x 625.3D mm cabinet and 41.7 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.
Full Paradigm Defiance X15 review and specifications →
| CEA-2010-A Average (40-80Hz) | 122.9 dB |
|---|---|
| Cabinet Color | black |
| Country | Canada |
| Dimensions | 24.6"H x 23.2"W x 24.6"D (625.3 x 588.8 x 625.3 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | ported, bottom |
| Measurement Source | Audioholics |
| Output SPL at 15 Hz | 102.8 dB |
| Output SPL at 20 Hz | 109.2 dB |
| Output SPL at 25 Hz | 112.2 dB |
| Output SPL at 31.5 Hz | 116.2 dB |
| Output SPL at 40 Hz | 121.3 dB |
| Output SPL at 50 Hz | 123.4 dB |
| Output SPL at 63 Hz | 123.8 dB |
| Output SPL at 80 Hz | 123.1 dB |
| Output SPL at 100 Hz | 121.9 dB |
| Output SPL at 125 Hz | 121.2 dB |
| Warranty | 3 |
| Weight | 91.9 lbs / 41.7 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons