Short answer: the WW Speaker Cabinets X21 for maximum output. Its 21-inch driver in a large ported cabinet averages 131.3dB on CEA-2010-A, the highest output of any passive subwoofer tested, and it ranks #3 of 110. The Danley Sound Labs DTS10’s dual 12-inch tapped horn still averages 129.6dB and remains in production, but it needs an external amplifier, weighs 129kg and ranks #14.
What the Danley Sound Labs DTS10 gets right: Dual 12-inch tapped horn design delivers 129.6dB CEA-2010-A average and remains in current production. The catch: Requires external amplifier, extremely heavy at 129 kg (284.4 lbs), very large cabinet, and specialized tapped-horn design.
On the WW Speaker Cabinets X21 - B&C 21DS115-4 side: 21-inch driver in a large ported cabinet delivers 131.3dB CEA-2010-A average, the highest output of any passive subwoofer tested. The tradeoff: Premium $3,995 price, massive 52 kg (114.6 lbs) cabinet, and ported room gain dependency.
Buy the WW Speaker Cabinets X21 - B&C 21DS115-4. It ranks higher for sound quality than the Danley Sound Labs DTS10 and costs less, which settles it without a real tradeoff to make.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| Danley Sound Labs DTS10 | WW Speaker Cabinets X21 - B&C 21DS115-4 | |
|---|---|---|
| Price | $4,400 Passive | $3995 Passive |
| Ranked | #14 of 110 in Large Home Subwoofers (Over 75 lbs) | #3 of 110 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | tapped horn | ported, front |
| Passive | Yes | Yes |
| Output SPL at 10 Hz | 94.2 dB | - |
| Output SPL at 12.5 Hz | 110.6 dB | 96.2 dB |
| Output SPL at 15 Hz | 119.0 dB | 111.9 dB |
| Output SPL at 20 Hz | 122.5 dB | 121.9 dB |
| Output SPL at 25 Hz | 125.5 dB | 120.8 dB |
| Output SPL at 31.5 Hz | 128.3 dB | 122.5 dB |
| Output SPL at 40 Hz | 125.3 dB | 126.7 dB |
| Output SPL at 50 Hz | 127.3 dB | 129.2 dB |
| Output SPL at 63 Hz | 130.9 dB | 132.9 dB |
| Output SPL at 80 Hz | 135.0 dB | 136.3 dB |
| Output SPL at 100 Hz | 133.0 dB | 139.0 dB |
| Output SPL at 125 Hz | 128.7 dB | 140.1 dB |
| CEA-2010-A Average (40-80Hz) | 129.6 dB | 131.3 dB |
| Dimensions | 44"H x 59.5"W x 16"D (1117.6 x 1511.3 x 406.4 mm) | 24"H x 32"W x 32"D (609.6 x 812.8 x 812.8 mm) |
| Weight | 285.1 lbs (129.3 kg) | 115.1 lbs (52.2 kg) |
| Warranty | 5 | - |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Data-bass | Data-bass |
| Drivers | 2x 12" (305mm) driver | 21" (533mm) driver |
Related Speaker Comparisons
More worthwhile head-to-heads for WW Speaker Cabinets X21 - B&C 21DS115-4:
- 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
- Monoprice Monolith 16 THX Ultra vs WW Speaker Cabinets X21 - B&C 21DS115-4
- Reaction Audio PV-15X vs WW Speaker Cabinets X21 - B&C 21DS115-4
Prices on this page were last checked September 22, 2026 at 5:11 AM 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
Danley Sound Labs DTS10: $4,400 Passive eBay
Pros: Dual 12-inch tapped horn design delivers 129.6dB CEA-2010-A average and remains in current production, unlike most of the subwoofers ranked above it.
Cons: Requires external amplifier, extremely heavy at 129 kg, very large cabinet, and specialized tapped-horn design.
Full Danley Sound Labs DTS10 review and specifications →
| CEA-2010-A Average (40-80Hz) | 129.6 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 44"H x 59.5"W x 16"D (1117.6 x 1511.3 x 406.4 mm) |
| Drivers | 2x 12" (305mm) driver |
| Enclosure | tapped horn |
| Measurement Source | Data-bass |
| Output SPL at 10 Hz | 94.2 dB |
| Output SPL at 12.5 Hz | 110.6 dB |
| Output SPL at 15 Hz | 119.0 dB |
| Output SPL at 20 Hz | 122.5 dB |
| Output SPL at 25 Hz | 125.5 dB |
| Output SPL at 31.5 Hz | 128.3 dB |
| Output SPL at 40 Hz | 125.3 dB |
| Output SPL at 50 Hz | 127.3 dB |
| Output SPL at 63 Hz | 130.9 dB |
| Output SPL at 80 Hz | 135.0 dB |
| Output SPL at 100 Hz | 133.0 dB |
| Output SPL at 125 Hz | 128.7 dB |
| Passive | Yes |
| Warranty | 5 |
| Weight | 285.1 lbs (129.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Data-bass; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Danley Sound Labs DTS10 vs JTR Speakers Growler (2015)
- Danley Sound Labs DTS10 vs Monoprice Monolith 16 THX Ultra
- Danley Sound Labs DTS10 vs JTR Speakers Captivator S2
- Danley Sound Labs DTS10 vs Reaction Audio PV-15X
- Danley Sound Labs DTS10 vs Pro Audio Technology LFC-24sm
- Danley Sound Labs DTS10 vs JBL 4645C
- Danley Sound Labs DTS10 vs Chase Home Theater SS18.1
- Danley Sound Labs DTS10 vs HSU Research VTF-15H MK2
- See all 9 comparisons
WW Speaker Cabinets X21 - B&C 21DS115-4: $3995 Passive eBay
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 $3995 price, massive 52 kg cabinet, and ported room gain dependency.
Full WW Speaker Cabinets X21 - B&C 21DS115-4 review and specifications →
| CEA-2010-A Average (40-80Hz) | 131.3 dB |
|---|---|
| Country | United States |
| Dimensions | 24"H x 32"W x 32"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) |
- Reviews, Comparisons and Sound Samples
- Independently measured by Data-bass; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- WW Speaker Cabinets X21 - B&C 21DS115-4 vs Pro Audio Technology LFC-24sm
- WW Speaker Cabinets X21 - B&C 21DS115-4 vs JTR Speakers Captivator S2
- WW Speaker Cabinets X21 - B&C 21DS115-4 vs JTR Speakers Growler (2015)
- WW Speaker Cabinets X21 - B&C 21DS115-4 vs Monoprice Monolith 16 THX Ultra
- WW Speaker Cabinets X21 - B&C 21DS115-4 vs Reaction Audio PV-15X
- WW Speaker Cabinets X21 - B&C 21DS115-4 vs JBL 4645C
- WW Speaker Cabinets X21 - B&C 21DS115-4 vs Chase Home Theater SS18.1
- WW Speaker Cabinets X21 - B&C 21DS115-4 vs HSU Research VTF-15H MK2
- See all 9 comparisons