Short answer: the Rythmik F18, if you are buying new. The Rythmik FV25HP ranks higher than it (#23 vs #85 of 143 subwoofers, 4.4/5 vs 4.1/5) but is discontinued, so only consider it used; the Rythmik F18 is still sold new at $2,344.
The Rythmik FV25HP is the better-sounding pick. A tall dual 15 inch ported subwoofer with strong, deep bass for big rooms and both balanced and RCA inputs. The tradeoff: The 1054.1H x 533.4W x 558.8D mm cabinet and 210.1 lbs (95.3 kg) mass make this a serious placement and moving commitment.
What the Rythmik F18 does well: A massive sealed 18 inch subwoofer with tight, powerful bass and balanced XLR inputs, built for big home theaters. Watch for: The 520.7H x 520.7W x 533.4D mm cabinet and 115.1 lbs (52.2 kg) mass make this a serious placement and moving commitment.
Buy the Rythmik F18, since the Rythmik FV25HP is discontinued and only worth hunting down used.
Still deciding? The full Subwoofers rankings cover every ranked option.
A tall dual 15 inch ported subwoofer with strong, deep bass for big rooms and both balanced and RCA inputs.
A massive sealed 18 inch subwoofer with tight, powerful bass and balanced XLR inputs, built for big home theaters.
Prices on this page were last checked October 31, 2026 at 7:11 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
| Rythmik FV25HP | Rythmik F18 | |
|---|---|---|
| Price | $2,499 Discontinued | $2,344 |
| Ranked | #23 of 143 in Large Home Subwoofers (Over 75 lbs) | #85 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | sealed |
| Output SPL at 10 Hz | 99.7 dB | 93.7 dB |
| Output SPL at 12.5 Hz | 108.4 dB | 97.4 dB |
| Output SPL at 15 Hz | 113.2 dB | 102.0 dB |
| Output SPL at 20 Hz | 116.6 dB | 106.2 dB |
| Output SPL at 25 Hz | 119.1 dB | 110.9 dB |
| Output SPL at 31.5 Hz | 122.4 dB | 114.3 dB |
| Output SPL at 40 Hz | 124.7 dB | 117.1 dB |
| Output SPL at 50 Hz | 126.1 dB | 119.1 dB |
| Output SPL at 63 Hz | 126.7 dB | 120.5 dB |
| Output SPL at 80 Hz | 127.3 dB | 121.2 dB |
| Output SPL at 100 Hz | 127.9 dB | 121.4 dB |
| Output SPL at 125 Hz | 127.8 dB | 121.4 dB |
| CEA-2010-A Average (40-80Hz) | 126.2 dB | 119.5 dB |
| Dimensions | 41.5”H x 21”W x 22”D (1054.1 x 533.4 x 558.8 mm) | 20.5”H x 20.5”W x 21”D (520.7 x 520.7 x 533.4 mm) |
| Weight | 210.1 lbs (95.3 kg) | 115.1 lbs (52.2 kg) |
| Warranty | 5/3 | 5/3 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Data-bass | Data-bass |
| Drivers | 2x 15” (381mm) driver | 18” (457mm) driver |
| Inputs | XLR (2), RCA (line/LFE) | XLR (2), RCA (line/LFE) |
| XLR Input | Yes | Yes |
| RCA Input | Yes | Yes |
| TRS Input | No | No |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | No |
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