Short answer: both are discontinued, so this only matters if you are buying used. Used, the JTR Speakers Growler (2015) is the better pick: it ranks #13 of 143 subwoofers by sound quality (rated 4.5/5), against #23 (rated 4.4/5) for the Rythmik FV25HP. If you want one new, the JTR Speakers Captivator 215PRO ranks #7 at $3,500.

The case for the Rythmik FV25HP: 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 JTR Speakers Growler (2015) does well: A 12 inch ported subwoofer with output close to far bigger flagships, a strong used pick now that it is discontinued. The catch: Ported design room interaction, 99.2 lbs (45 kg) size, and $2995 cost.
Buy the JTR Speakers Growler (2015) only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, start with the JTR Speakers Captivator 215PRO instead.
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 12 inch ported subwoofer with output close to far bigger flagships, a strong used pick now that it is discontinued.
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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Rythmik FV25HP | JTR Speakers Growler (2015) | |
|---|---|---|
| Price | $2,499 Discontinued | $2,995 Passive, Discontinued |
| Ranked | #23 of 143 in Large Home Subwoofers (Over 75 lbs) | #13 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 | - |
| Output SPL at 15 Hz | 113.2 dB | - |
| Output SPL at 20 Hz | 116.6 dB | 92.8 dB |
| Output SPL at 25 Hz | 119.1 dB | 97.2 dB |
| Output SPL at 31.5 Hz | 122.4 dB | 106.6 dB |
| Output SPL at 40 Hz | 124.7 dB | 122.7 dB |
| Output SPL at 50 Hz | 126.1 dB | 130.0 dB |
| Output SPL at 63 Hz | 126.7 dB | 133.6 dB |
| Output SPL at 80 Hz | 127.3 dB | 134.4 dB |
| Output SPL at 100 Hz | 127.9 dB | 135.5 dB |
| Output SPL at 125 Hz | 127.8 dB | 136.0 dB |
| CEA-2010-A Average (40-80Hz) | 126.2 dB | 130.2 dB |
| Dimensions | 41.5”H x 21”W x 22”D (1054.1 x 533.4 x 558.8 mm) | 22.5”H x 30”W x 20”D (571.5 x 762.0 x 508.0 mm) |
| Weight | 210.1 lbs (95.3 kg) | 100.1 lbs (45.4 kg) |
| Warranty | 5/3 | 5 years |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Data-bass | Data-bass |
| Drivers | 2x 15” (381mm) driver | 12” (305mm) driver |
| 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 | - |
| Passive | - | Yes |
Related Speaker Comparisons
How JTR Speakers Growler (2015) compares with other leading options: