Short answer: the WW Speaker Cabinets X21 - B&C 21DS115-4 for the higher ranking, the Chase Home Theater SS18.1 for the lower price. The WW Speaker Cabinets X21 - B&C 21DS115-4 ranks #1 of 7 subwoofers at $3995. The Chase Home Theater SS18.1 ranks #6 at $2499, $1496 cheaper.
On the Chase Home Theater SS18.1 side: 18-inch sealed driver delivers 125.2dB CEA-2010-A average from a dedicated cinema-style sealed cabinet. The tradeoff: Passive design needs external amplification, 41 kg weight, and sealed design room modes.
The case for the WW Speaker Cabinets X21 - B&C 21DS115-4: 21-inch driver in a large ported cabinet delivers 131.3dB CEA-2010-A average, the highest output of any passive subwoofer tested. Set against that: Premium $3,995 price, massive 52 kg cabinet, and ported room gain dependency.
One note: the Chase Home Theater SS18.1 is discontinued, but it still ranks #6 of 7 subwoofers, ahead of most of what is still sold new, so it is worth considering used.
Buy the Chase Home Theater SS18.1 if the price matters more than the ranking. Buy the WW Speaker Cabinets X21 - B&C 21DS115-4 if the ranking matters more than the price.
Specifications Side By Side
| Chase Home Theater SS18.1 | WW Speaker Cabinets X21 - B&C 21DS115-4 | |
|---|---|---|
| Price | $2499 Discontinued | $3995 |
| Ranked | #6 of 7 in Large Passive Home Subwoofers (Over 75 lbs) | #1 of 7 in Large Passive Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, front |
| Passive | Yes | Yes |
| Output SPL at 12.5 Hz | 92.8 dB | 96.2 dB |
| Output SPL at 15 Hz | 97.2 dB | 111.9 dB |
| Output SPL at 20 Hz | 101.3 dB | 121.9 dB |
| Output SPL at 25 Hz | 106.0 dB | 120.8 dB |
| Output SPL at 31.5 Hz | 111.6 dB | 122.5 dB |
| Output SPL at 40 Hz | 118.2 dB | 126.7 dB |
| Output SPL at 50 Hz | 123.6 dB | 129.2 dB |
| Output SPL at 63 Hz | 128.1 dB | 132.9 dB |
| Output SPL at 80 Hz | 130.8 dB | 136.3 dB |
| Output SPL at 100 Hz | 132.6 dB | 139.0 dB |
| Output SPL at 125 Hz | 133.7 dB | 140.1 dB |
| CEA-2010-A Average (40-80Hz) | 125.2 dB | 131.3 dB |
| Dimensions | 22.0"H x 24.0"W x 22.0"D (558.8 x 609.6 x 558.8 mm) | 24.0"H x 32.0"W x 32.0"D (609.6 x 812.8 x 812.8 mm) |
| Measurement Source | Data-bass | Data-bass |
| Discontinued | Yes | - |
| Weight | 89.9 lbs / 40.8 kg | 115.1 lbs / 52.2 kg |
| Drivers | 18" (457mm) driver | 21" (533mm) driver |
The Two Speakers In Full
Chase Home Theater SS18.1: $2499 Discontinued
Pros: 18-inch sealed driver delivers 125.2dB CEA-2010-A average from a dedicated cinema-style sealed cabinet.
Cons: Passive design needs external amplification, 41 kg weight, and sealed design room modes. Discontinued.
| CEA-2010-A Average (40-80Hz) | 125.2 dB |
|---|---|
| Dimensions | 22.0"H x 24.0"W x 22.0"D (558.8 x 609.6 x 558.8 mm) |
| Discontinued | Yes |
| Drivers | 18" (457mm) driver |
| Enclosure | sealed |
| Measurement Source | Data-bass |
| Output SPL at 12.5 Hz | 92.8 dB |
| Output SPL at 15 Hz | 97.2 dB |
| Output SPL at 20 Hz | 101.3 dB |
| Output SPL at 25 Hz | 106.0 dB |
| Output SPL at 31.5 Hz | 111.6 dB |
| Output SPL at 40 Hz | 118.2 dB |
| Output SPL at 50 Hz | 123.6 dB |
| Output SPL at 63 Hz | 128.1 dB |
| Output SPL at 80 Hz | 130.8 dB |
| Output SPL at 100 Hz | 132.6 dB |
| Output SPL at 125 Hz | 133.7 dB |
| Passive | Yes |
| Weight | 89.9 lbs / 40.8 kg |
- Buy Used
- Head-to-Head Comparisons
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WW Speaker Cabinets X21 - B&C 21DS115-4: $3995
Pros: 21-inch driver in a large ported cabinet delivers 131.3dB CEA-2010-A average, the highest output of any passive subwoofer tested.
Cons: Premium $3,995 price, massive 52 kg cabinet, and ported room gain dependency.
| CEA-2010-A Average (40-80Hz) | 131.3 dB |
|---|---|
| Dimensions | 24.0"H x 32.0"W x 32.0"D (609.6 x 812.8 x 812.8 mm) |
| Drivers | 21" (533mm) driver |
| Enclosure | ported, front |
| Measurement Source | Data-bass |
| Output SPL at 12.5 Hz | 96.2 dB |
| Output SPL at 15 Hz | 111.9 dB |
| Output SPL at 20 Hz | 121.9 dB |
| Output SPL at 25 Hz | 120.8 dB |
| Output SPL at 31.5 Hz | 122.5 dB |
| Output SPL at 40 Hz | 126.7 dB |
| Output SPL at 50 Hz | 129.2 dB |
| Output SPL at 63 Hz | 132.9 dB |
| Output SPL at 80 Hz | 136.3 dB |
| Output SPL at 100 Hz | 139.0 dB |
| Output SPL at 125 Hz | 140.1 dB |
| Passive | Yes |
| Weight | 115.1 lbs / 52.2 kg |
- Head-to-Head Comparisons
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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.