Short answer: both are discontinued, so this only matters if you are buying used. Used, the Rythmik FV25HP is the better pick: it ranks #23 of 143 subwoofers by sound quality (rated 4.4/5), against #142 (rated 3.3/5) for the SVS SB13-Plus.
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 catch: 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.
The case for the SVS SB13-Plus: A sealed 13 inch subwoofer with XLR and RCA inputs in a compact cube cabinet, now discontinued. The tradeoff: 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.
Buy the Rythmik FV25HP only if you find one used in good condition; both are discontinued, and it is the better rated of the two.
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 sealed 13 inch subwoofer with XLR and RCA inputs in a compact cube cabinet, now discontinued.
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Specifications Side By Side
| Rythmik FV25HP | SVS SB13-Plus | |
|---|---|---|
| Price | $2,499 Discontinued | $1,399 Discontinued |
| Ranked | #23 of 143 in Large Home Subwoofers (Over 75 lbs) | #142 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | sealed |
| Output SPL at 10 Hz | 99.7 dB | - |
| Output SPL at 12.5 Hz | 108.4 dB | - |
| Output SPL at 15 Hz | 113.2 dB | - |
| Output SPL at 20 Hz | 116.6 dB | 92.3 dB |
| Output SPL at 25 Hz | 119.1 dB | 97.2 dB |
| Output SPL at 31.5 Hz | 122.4 dB | 97.2 dB |
| Output SPL at 40 Hz | 124.7 dB | 108.1 dB |
| Output SPL at 50 Hz | 126.1 dB | 108.1 dB |
| Output SPL at 63 Hz | 126.7 dB | 108.1 dB |
| Output SPL at 80 Hz | 127.3 dB | - |
| Output SPL at 100 Hz | 127.9 dB | - |
| Output SPL at 125 Hz | 127.8 dB | - |
| CEA-2010-A Average (40-80Hz) | 126.2 dB | 108.1 dB (avg of 3/4 bands) |
| Dimensions | 41.5”H x 21”W x 22”D (1054.1 x 533.4 x 558.8 mm) | 17”H x 17”W x 18”D (431.8 x 431.8 x 457.2 mm) |
| Weight | 210.1 lbs (95.3 kg) | 95 lbs (43.1 kg) |
| Warranty | 5/3 | 5 |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Data-bass | Brent Butterworth |
| Drivers | 2x 15” (381mm) driver | 13” (330mm) driver |
| Inputs | XLR (2), RCA (line/LFE) | XLR (balanced), RCA |
| 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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