Short answer: the Funk Audio Classic 18.0. It ranks #11 of 97 subwoofers by sound quality at $4893.35; the Harbottle Audio C24 L2 ranks #12 and costs $10078.84, which makes this an easy call rather than a real tradeoff.
Buy the Funk Audio Classic 18.0. It ranks higher for sound quality than the Harbottle Audio C24 L2 and costs less, so there is no real case for the other one.
Specifications Side By Side
| Funk Audio Classic 18.0 | Harbottle Audio C24 L2 | |
|---|---|---|
| Price | $4,893.35 | $10,078.84 |
| Ranked | #11 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #12 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported |
| Output SPL at 10 Hz | 94.6 dB | 99.0 dB |
| Output SPL at 12.5 Hz | 98.4 dB | 103.0 dB |
| Output SPL at 15 Hz | 102.3 dB | 110.0 dB |
| Output SPL at 20 Hz | 106.5 dB | 117.0 dB |
| Output SPL at 25 Hz | 111.7 dB | 120.7 dB |
| Output SPL at 31.5 Hz | 119.0 dB | 124.0 dB |
| Output SPL at 40 Hz | 124.6 dB | 126.3 dB |
| Output SPL at 50 Hz | 126.8 dB | 127.3 dB |
| Output SPL at 63 Hz | 128.4 dB | 126.7 dB |
| Output SPL at 80 Hz | 129.6 dB | 126.0 dB |
| Output SPL at 100 Hz | 130.2 dB | 125.0 dB |
| Output SPL at 125 Hz | 130.8 dB | - |
| CEA-2010-A Average (40-80Hz) | 127.3 dB | 126.6 dB |
| Dimensions | 22.5"H x 22"W x 20.5"D (571.5 x 558.8 x 520.7 mm) | 35.4"H x 28.4"W x 20.2"D (899.9 x 722.1 x 512.1 mm) |
| Weight | 115.1 lbs / 52.2 kg | 149.9 lbs / 68.0 kg |
| Warranty | 3 | - |
| Cabinet Color | wood, custom | black, white, red, blue |
| Country | Canada | Canada |
| Measurement Source | Data-bass | Manufacturer |
| Drivers | 18" (457mm) driver | 24" (610mm) driver |
Related Speaker Comparisons
More top alternatives to Funk Audio Classic 18.0:
- Funk Audio Classic 18.0 vs Funk Audio Ultra 24.0
- Funk Audio Classic 18.0 vs Funk Audio Custom 21.0
- Funk Audio Classic 18.0 vs Monoprice Monolith 16 THX Ultra
- Funk Audio Custom 21.0 vs Harbottle Audio C24 L2
- Harbottle Audio C24 L2 vs Monoprice Monolith 16 THX Ultra
Prices on this page were last checked September 8, 2026 at 6:02 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
Funk Audio Classic 18.0: $4,893.35 eBay
Pros: Independent CEA-2010 testing records 106.5 dB at 20 Hz and 127.3 dB through 40-80 Hz. The sealed enclosure with 18” (457mm) driver delivers formidable upper-bass output for movie effects and music.
Cons: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority. The 571.5H x 558.8W x 520.7D mm cabinet and 52.2 kg mass still require deliberate placement and calibration.
Notes: Data-bass labeled this sub as ‘FW18.0’, but original name is 18.0
Full Funk Audio Classic 18.0 review and specifications →
| CEA-2010-A Average (40-80Hz) | 127.3 dB |
|---|---|
| Cabinet Color | wood, custom |
| Country | Canada |
| Dimensions | 22.5"H x 22"W x 20.5"D (571.5 x 558.8 x 520.7 mm) |
| Drivers | 18" (457mm) driver |
| Enclosure | sealed |
| Measurement Source | Data-bass |
| Output SPL at 10 Hz | 94.6 dB |
| Output SPL at 12.5 Hz | 98.4 dB |
| Output SPL at 15 Hz | 102.3 dB |
| Output SPL at 20 Hz | 106.5 dB |
| Output SPL at 25 Hz | 111.7 dB |
| Output SPL at 31.5 Hz | 119.0 dB |
| Output SPL at 40 Hz | 124.6 dB |
| Output SPL at 50 Hz | 126.8 dB |
| Output SPL at 63 Hz | 128.4 dB |
| Output SPL at 80 Hz | 129.6 dB |
| Output SPL at 100 Hz | 130.2 dB |
| Output SPL at 125 Hz | 130.8 dB |
| Warranty | 3 |
| Weight | 115.1 lbs / 52.2 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Harbottle Audio C24 L2: $10,078.84 eBay
Pros: Published CEA-2010 specifications list 117.0 dB at 20 Hz and 126.6 dB through 40-80 Hz. The ported enclosure with 24” (610mm) driver has the headroom for demanding film bass in a large room.
Cons: The 899.9H x 722.1W x 512.1D mm cabinet and 68.0 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 C24 L2 review and specifications →
| CEA-2010-A Average (40-80Hz) | 126.6 dB |
|---|---|
| Cabinet Color | black, white, red, blue |
| Country | Canada |
| Dimensions | 35.4"H x 28.4"W x 20.2"D (899.9 x 722.1 x 512.1 mm) |
| Drivers | 24" (610mm) driver |
| Enclosure | ported |
| Measurement Source | Manufacturer |
| Output SPL at 10 Hz | 99.0 dB |
| Output SPL at 12.5 Hz | 103.0 dB |
| Output SPL at 15 Hz | 110.0 dB |
| Output SPL at 20 Hz | 117.0 dB |
| Output SPL at 25 Hz | 120.7 dB |
| Output SPL at 31.5 Hz | 124.0 dB |
| Output SPL at 40 Hz | 126.3 dB |
| Output SPL at 50 Hz | 127.3 dB |
| Output SPL at 63 Hz | 126.7 dB |
| Output SPL at 80 Hz | 126.0 dB |
| Output SPL at 100 Hz | 125.0 dB |
| Weight | 149.9 lbs / 68.0 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons