Harbottle Audio C18 L1 vs Velodyne Acoustics DD-18+

Last updated: September 29, 2026

Short answer: the Harbottle Audio C18 L1, if you are buying new. The Velodyne Acoustics DD-18+ measures as well as it (#79 vs #77 of 109 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.

Harbottle Audio C18 L1 vs Velodyne Acoustics DD-18+

What the Harbottle Audio C18 L1 does well: Published CEA-2010 specifications list 108.0 dB at 20 Hz and 118.5 dB through 40-80 Hz. Watch for: The 670.1H x 578.1W x 460.0D mm cabinet and 39.0 kg mass make this a serious placement and moving commitment.

What the Velodyne Acoustics DD-18+ does well: Independent CEA-2010 testing records 106.4 dB at 20 Hz and 118.3 dB through 40-80 Hz. Watch for: The 576.6H x 525.8W x 650.2D mm cabinet and 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.

Specifications Side By Side

Harbottle Audio C18 L1 Velodyne Acoustics DD-18+
Price$5,331.56$5,000 Discontinued
Ranked#77 of 109 in Large Home Subwoofers (Over 75 lbs)#79 of 109 in Large Home Subwoofers (Over 75 lbs)
Enclosureportedsealed
Output SPL at 10 Hz93.0 dB87.6 dB
Output SPL at 12.5 Hz98.0 dB92.2 dB
Output SPL at 15 Hz102.0 dB101.8 dB
Output SPL at 20 Hz108.0 dB106.4 dB
Output SPL at 25 Hz112.0 dB111.3 dB
Output SPL at 31.5 Hz117.0 dB116.0 dB
Output SPL at 40 Hz119.0 dB118.8 dB
Output SPL at 50 Hz119.0 dB119.8 dB
Output SPL at 63 Hz118.0 dB118.3 dB
Output SPL at 80 Hz118.0 dB116.5 dB
Output SPL at 100 Hz117.5 dB115.1 dB
Output SPL at 125 Hz117.0 dB113.5 dB
CEA-2010-A Average (40-80Hz)118.5 dB118.3 dB
Dimensions26.4”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)
Weight86 lbs (39.0 kg)142 lbs (64.4 kg)
Cabinet Colorblack, white, red, blueblack, wood
CountryCanadaUnited States
Measurement SourceManufacturerAudioholics
Drivers18” (457mm) driver18” (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

How Harbottle Audio C18 L1 compares with other leading options:

Prices on this page were last checked September 30, 2026 at 2:57 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

Harbottle Audio C18 L1: $5,331.56 eBay

Harbottle Audio C18 L1 ranking card

Pros: Published CEA-2010 specifications list 108.0 dB at 20 Hz and 118.5 dB through 40-80 Hz. The ported enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room.

Cons: The 670.1H x 578.1W x 460.0D mm cabinet and 39.0 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 Harbottle Audio C18 L1 review and specifications →

CEA-2010-A Average (40-80Hz)118.5 dB
Cabinet Colorblack, white, red, blue
CountryCanada
Dimensions26.4”H x 22.8”W x 18.1”D (670.1 x 578.1 x 460.0 mm)
Drivers18” (457mm) driver
Enclosureported
Measurement SourceManufacturer
Output SPL at 10 Hz93.0 dB
Output SPL at 12.5 Hz98.0 dB
Output SPL at 15 Hz102.0 dB
Output SPL at 20 Hz108.0 dB
Output SPL at 25 Hz112.0 dB
Output SPL at 31.5 Hz117.0 dB
Output SPL at 40 Hz119.0 dB
Output SPL at 50 Hz119.0 dB
Output SPL at 63 Hz118.0 dB
Output SPL at 80 Hz118.0 dB
Output SPL at 100 Hz117.5 dB
Output SPL at 125 Hz117.0 dB
Weight86 lbs (39.0 kg)
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Velodyne Acoustics DD-18+: $5,000 Discontinued eBay

Velodyne Acoustics DD-18+ ranking card

Pros: Independent CEA-2010 testing records 106.4 dB at 20 Hz and 118.3 dB through 40-80 Hz. The sealed enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room.

Cons: The 576.6H x 525.8W x 650.2D mm cabinet and 64.4 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks. Discontinued.

Full Velodyne Acoustics DD-18+ review and specifications →

AES InputNo
Aux InputNo
CEA-2010-A Average (40-80Hz)118.3 dB
Cabinet Colorblack, wood
Coaxial InputNo
CountryUnited States
Dimensions22.7”H x 20.7”W x 25.6”D (576.6 x 525.8 x 650.2 mm)
Drivers18” (457mm) driver
Enclosuresealed
HDMI InputNo
InputsXLR (balanced, L/R), with pass-through and high-pass outputs
Measurement SourceAudioholics
Optical InputNo
Output SPL at 10 Hz87.6 dB
Output SPL at 12.5 Hz92.2 dB
Output SPL at 15 Hz101.8 dB
Output SPL at 20 Hz106.4 dB
Output SPL at 25 Hz111.3 dB
Output SPL at 31.5 Hz116.0 dB
Output SPL at 40 Hz118.8 dB
Output SPL at 50 Hz119.8 dB
Output SPL at 63 Hz118.3 dB
Output SPL at 80 Hz116.5 dB
Output SPL at 100 Hz115.1 dB
Output SPL at 125 Hz113.5 dB
RCA InputNo
TRS InputNo
USB InputNo
Weight142 lbs (64.4 kg)
XLR InputYes
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