Short answer: the Monoprice Monolith M-215, if you are buying new. The Rythmik FV25HP measures as well as it (#23 vs #24 of 143 subwoofers, 4.4/5 vs 4.4/5) but is discontinued, so only consider it used; the Monoprice Monolith M-215 is still sold new at $2,999.99.
What the Rythmik FV25HP does well: A tall dual 15 inch ported subwoofer with strong, deep bass for big rooms and both balanced and RCA inputs. Watch for: 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 Monoprice Monolith M-215: A dual 15 inch ported subwoofer with excellent output down to the lowest notes, a strong value for large home theaters. Watch for: The 1074.4H x 508.0W x 701.0D mm cabinet and 216.1 lbs (98.0 kg) mass make this a serious placement and moving commitment.
Buy the Monoprice Monolith M-215 new; the Rythmik FV25HP is no longer sold new, so it only makes sense as a used find.
Want more options? Browse the full Subwoofers rankings.
A tall dual 15 inch ported subwoofer with strong, deep bass for big rooms and both balanced and RCA inputs.
A dual 15 inch ported subwoofer with excellent output down to the lowest notes, a strong value for large 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 | Monoprice Monolith M-215 | |
|---|---|---|
| Price | $2,499 Discontinued | $2999.99 |
| Ranked | #23 of 143 in Large Home Subwoofers (Over 75 lbs) | #24 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Output SPL at 10 Hz | 99.7 dB | - |
| Output SPL at 12.5 Hz | 108.4 dB | 103.9 dB |
| Output SPL at 15 Hz | 113.2 dB | 113.1 dB |
| Output SPL at 20 Hz | 116.6 dB | 118.9 dB |
| Output SPL at 25 Hz | 119.1 dB | 122.6 dB |
| Output SPL at 31.5 Hz | 122.4 dB | 125.2 dB |
| Output SPL at 40 Hz | 124.7 dB | 126.4 dB |
| Output SPL at 50 Hz | 126.1 dB | 126.1 dB |
| Output SPL at 63 Hz | 126.7 dB | 125.6 dB |
| Output SPL at 80 Hz | 127.3 dB | 125.6 dB |
| Output SPL at 100 Hz | 127.9 dB | 125.7 dB |
| Output SPL at 125 Hz | 127.8 dB | 126.3 dB |
| CEA-2010-A Average (40-80Hz) | 126.2 dB | 125.9 dB |
| Dimensions | 41.5”H x 21”W x 22”D (1054.1 x 533.4 x 558.8 mm) | 42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm) |
| Weight | 210.1 lbs (95.3 kg) | 216.1 lbs (98.0 kg) |
| Warranty | 5/3 | 5 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Data-bass | Brent Butterworth |
| Drivers | 2x 15” (381mm) driver | 2x 15” (381mm) drivers |
| 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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