Short answer: the Rythmik FV18. Both are rated 4.2/5 for sound quality (#60 and #61 of 143 subwoofers), and the Rythmik FV18 costs $2,670 against $6,244.50 for the Harbottle Audio C24 L1, so with nothing between them on sound quality, price settles it.
What the Harbottle Audio C24 L1 does well: A 24 inch ported subwoofer with deep bass and good headroom for film soundtracks in large rooms. The catch: The 899.9H x 722.1W x 512.1D mm cabinet and 138.9 lbs (63.0 kg) mass make this a serious placement and moving commitment.
The case for the Rythmik FV18: An 18 inch ported subwoofer with deep, powerful bass for large rooms and flexible balanced and RCA inputs. The catch: The 838.2H x 533.4W x 558.8D mm cabinet and 160.1 lbs (72.6 kg) mass make this a serious placement and moving commitment.
Buy the Rythmik FV18. Both are rated the same for sound quality, and it costs $3,574.50 less than the Harbottle Audio C24 L1.
Want more options? Browse the full Subwoofers rankings.
A 24 inch ported subwoofer with deep bass and good headroom for film soundtracks in large rooms.
An 18 inch ported subwoofer with deep, powerful bass for large rooms and flexible balanced and RCA inputs.
Prices on this page were last checked October 23, 2026 at 8:27 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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Specifications Side By Side
| Harbottle Audio C24 L1 | Rythmik FV18 | |
|---|---|---|
| Price | $6,244.50 | $2,670 |
| Ranked | #61 of 143 in Large Home Subwoofers (Over 75 lbs) | #60 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported | ported, front |
| Output SPL at 10 Hz | 94.0 dB | - |
| Output SPL at 12.5 Hz | 99.0 dB | 102.0 dB |
| Output SPL at 15 Hz | 106.0 dB | 109.5 dB |
| Output SPL at 20 Hz | 114.0 dB | 114.3 dB |
| Output SPL at 25 Hz | 116.0 dB | 117.6 dB |
| Output SPL at 31.5 Hz | 121.0 dB | 119.2 dB |
| Output SPL at 40 Hz | 121.1 dB | 120.4 dB |
| Output SPL at 50 Hz | 121.6 dB | 121.3 dB |
| Output SPL at 63 Hz | 121.6 dB | 121.7 dB |
| Output SPL at 80 Hz | 121.0 dB | 121.9 dB |
| Output SPL at 100 Hz | 121.0 dB | 122.4 dB |
| CEA-2010-A Average (40-80Hz) | 121.3 dB | 121.3 dB |
| Dimensions | 35.4”H x 28.4”W x 20.2”D (899.9 x 722.1 x 512.1 mm) | 33”H x 21”W x 22”D (838.2 x 533.4 x 558.8 mm) |
| Weight | 138.9 lbs (63.0 kg) | 160.1 lbs (72.6 kg) |
| Cabinet Color | black, white, red, blue | black |
| Country | Canada | United States |
| Measurement Source | Manufacturer | Data-bass |
| Drivers | 24” (610mm) driver | 18” (457mm) driver |
| Output SPL at 125 Hz | - | 121.9 dB |
| Warranty | - | 5/3 |
| Inputs | - | XLR (2), RCA (line/LFE) |
| XLR Input | - | Yes |
| RCA Input | - | Yes |
| 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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