Short answer: the Rythmik FV15HP. It ranks #55 of 143 subwoofers by sound quality, rated 4.2/5, at $2,127; the Rythmik F18 ranks #85, rated 4.1/5, and costs $2,344, so there is little reason to consider the other one.
Buy the Rythmik FV15HP. It is rated higher for sound quality than the Rythmik F18 and costs less, which makes it the one to get unless you need something the other one does better.
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
| Rythmik F18 | Rythmik FV15HP | |
|---|---|---|
| Price | $2,344 | $2,127 |
| Ranked | #85 of 143 in Large Home Subwoofers (Over 75 lbs) | #55 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, front |
| Output SPL at 10 Hz | 93.7 dB | - |
| Output SPL at 12.5 Hz | 97.4 dB | 92.8 dB |
| Output SPL at 15 Hz | 102.0 dB | 105.1 dB |
| Output SPL at 20 Hz | 106.2 dB | 111.1 dB |
| Output SPL at 25 Hz | 110.9 dB | 116.1 dB |
| Output SPL at 31.5 Hz | 114.3 dB | 120.0 dB |
| Output SPL at 40 Hz | 117.1 dB | 122.5 dB |
| Output SPL at 50 Hz | 119.1 dB | 122.1 dB |
| Output SPL at 63 Hz | 120.5 dB | 121.8 dB |
| Output SPL at 80 Hz | 121.2 dB | 121.4 dB |
| Output SPL at 100 Hz | 121.4 dB | 121.2 dB |
| Output SPL at 125 Hz | 121.4 dB | 121.1 dB |
| CEA-2010-A Average (40-80Hz) | 119.5 dB | 122.0 dB |
| Dimensions | 20.5”H x 20.5”W x 21”D (520.7 x 520.7 x 533.4 mm) | 24.5”H x 18.2”W x 24.2”D (622.3 x 463.5 x 615.9 mm) |
| Weight | 115.1 lbs (52.2 kg) | 115.1 lbs (52.2 kg) |
| Warranty | 5/3 | 5/3 |
| Cabinet Color | black | black, white |
| Country | United States | United States |
| Measurement Source | Data-bass | Audioholics |
| Drivers | 18” (457mm) driver | 15” (381mm) 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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