Short answer: the WW Speaker Cabinets X21 for the highest tested output. Its 21-inch driver in a large ported cabinet delivers a 131.3dB CEA-2010-A average, the highest output of any passive subwoofer tested, against 125.2dB from the Chase SS18.1’s 18-inch sealed driver. The X21 is the heavier option at 52 kg (114.6 lbs) with a premium price and ported room gain dependency, while the Chase is passive and needs external amplification.
Buy the WW Speaker Cabinets X21 - B&C 21DS115-4. It is rated higher for sound quality, and the Chase Home Theater SS18.1 is discontinued, so it is only available used.
Looking for alternatives? See the complete Subwoofers rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Chase Home Theater SS18.1 | WW Speaker Cabinets X21 - B&C 21DS115-4 | |
|---|---|---|
| Price | $2,499 Passive, Discontinued | $3,995 Passive |
| Ranked | #34 of 143 in Large Home Subwoofers (Over 75 lbs) | #3 of 143 in Large 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”H x 24”W x 22”D (558.8 x 609.6 x 558.8 mm) | 24”H x 32”W x 32”D (609.6 x 812.8 x 812.8 mm) |
| Measurement Source | Data-bass | Data-bass |
| Weight | 89.9 lbs (40.8 kg) | 115.1 lbs (52.2 kg) |
| Drivers | 18” (457mm) driver | 21” (533mm) driver |
| Country | USA | United States |
Related Speaker Comparisons
How WW Speaker Cabinets X21 - B&C 21DS115-4 compares with other leading options:
- Pro Audio Technology LFC-24sm vs WW Speaker Cabinets X21 - B&C 21DS115-4
- JTR Speakers Captivator S2 vs WW Speaker Cabinets X21 - B&C 21DS115-4
- JTR Speakers Growler (2015) vs WW Speaker Cabinets X21 - B&C 21DS115-4
- Danley Sound Labs DTS10 vs WW Speaker Cabinets X21 - B&C 21DS115-4
- Monoprice Monolith 16 THX Ultra vs WW Speaker Cabinets X21 - B&C 21DS115-4