Short answer: the Funk Audio Custom 21.0. It ranks #12 of 143 subwoofers by sound quality, rated 4.5/5, at $6,061.91; the Harbottle Audio C24 L2 ranks #18, rated 4.4/5, and costs $10,078.84, which makes this an easy call rather than a real tradeoff.
Buy the Funk Audio Custom 21.0. It is rated higher for sound quality than the Harbottle Audio C24 L2 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
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.
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Specifications Side By Side
| Funk Audio Custom 21.0 | Harbottle Audio C24 L2 | |
|---|---|---|
| Price | $6,061.91 | $10,078.84 |
| Ranked | #12 of 143 in Large Home Subwoofers (Over 75 lbs) | #18 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported |
| Output SPL at 10 Hz | 97.4 dB | 99.0 dB |
| Output SPL at 12.5 Hz | 101.1 dB | 103.0 dB |
| Output SPL at 15 Hz | 105.7 dB | 110.0 dB |
| Output SPL at 20 Hz | 109.8 dB | 117.0 dB |
| Output SPL at 25 Hz | 114.2 dB | 120.7 dB |
| Output SPL at 31.5 Hz | 120.4 dB | 124.0 dB |
| Output SPL at 40 Hz | 124.1 dB | 126.3 dB |
| Output SPL at 50 Hz | 126.8 dB | 127.3 dB |
| Output SPL at 63 Hz | 129.0 dB | 126.7 dB |
| Output SPL at 80 Hz | 131.0 dB | 126.0 dB |
| Output SPL at 100 Hz | 132.6 dB | 125.0 dB |
| Output SPL at 125 Hz | 133.0 dB | - |
| CEA-2010-A Average (40-80Hz) | 127.7 dB | 126.6 dB |
| Dimensions | 22.8”H x 22.2”W x 20.5”D (577.9 x 565.1 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 | 145.1 lbs (65.8 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 | 21” (533mm) driver | 24” (610mm) driver |
| Inputs | XLR (balanced) | - |
| 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 | - |
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