Short answer: the Harbottle Audio C18 L1, if you are buying new. The Velodyne Acoustics DD-18+ measures as well as it (#95 vs #93 of 143 subwoofers, 4.1/5 vs 4.1/5) but is discontinued, so only consider it used; the Harbottle Audio C18 L1 is still sold new at $5,331.56.
What the Harbottle Audio C18 L1 does well: A ported 18 inch subwoofer with big, deep output for demanding movie soundtracks in a large room. Watch for: The 670.1H x 578.1W x 460.0D mm cabinet and 86 lbs (39.0 kg) mass make this a serious placement and moving commitment.
What the Velodyne Acoustics DD-18+ does well: A sealed 18 inch subwoofer with powerful output for big rooms and balanced inputs, now discontinued but worth buying used. Watch for: The 576.6H x 525.8W x 650.2D mm cabinet and 142 lbs (64.4 kg) mass make this a serious placement and moving commitment.
Buy the Harbottle Audio C18 L1 new; the Velodyne Acoustics DD-18+ is no longer sold new, so it only makes sense as a used find.
Still deciding? The full Subwoofers rankings cover every ranked option.
Prices on this page were last checked November 14, 2026 at 6:17 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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Specifications Side By Side
| Harbottle Audio C18 L1 | Velodyne Acoustics DD-18+ | |
|---|---|---|
| Price | $5,331.56 | $5,000 Discontinued |
| Ranked | #93 of 143 in Large Home Subwoofers (Over 75 lbs) | #95 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported | sealed |
| Output SPL at 10 Hz | 93.0 dB | 87.6 dB |
| Output SPL at 12.5 Hz | 98.0 dB | 92.2 dB |
| Output SPL at 15 Hz | 102.0 dB | 101.8 dB |
| Output SPL at 20 Hz | 108.0 dB | 106.4 dB |
| Output SPL at 25 Hz | 112.0 dB | 111.3 dB |
| Output SPL at 31.5 Hz | 117.0 dB | 116.0 dB |
| Output SPL at 40 Hz | 119.0 dB | 118.8 dB |
| Output SPL at 50 Hz | 119.0 dB | 119.8 dB |
| Output SPL at 63 Hz | 118.0 dB | 118.3 dB |
| Output SPL at 80 Hz | 118.0 dB | 116.5 dB |
| Output SPL at 100 Hz | 117.5 dB | 115.1 dB |
| Output SPL at 125 Hz | 117.0 dB | 113.5 dB |
| CEA-2010-A Average (40-80Hz) | 118.5 dB | 118.3 dB |
| Dimensions | 26.4”H x 22.8”W x 18.1”D (670.1 x 578.1 x 460.0 mm) | 22.7”H x 20.7”W x 25.6”D (576.6 x 525.8 x 650.2 mm) |
| Weight | 86 lbs (39.0 kg) | 142 lbs (64.4 kg) |
| Cabinet Color | black, white, red, blue | black, wood |
| Country | Canada | United States |
| Measurement Source | Manufacturer | Audioholics |
| Drivers | 18” (457mm) driver | 18” (457mm) driver |
| Inputs | - | XLR (balanced, L/R), with pass-through and high-pass outputs |
| XLR Input | - | Yes |
| RCA Input | - | No |
| TRS Input | - | No |
| Optical Input | - | No |
| Coaxial Input | - | No |
| USB Input | - | No |
| HDMI Input | - | No |
| AES Input | - | No |
| Aux Input | - | No |
Where the Ratings Come From
- Harbottle Audio C18 L1: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
- Velodyne Acoustics DD-18+: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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