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 #22 (rated 4.4/5) for the Reaction Audio PV-15X. If you want one new, the JTR Speakers Captivator 215PRO ranks #7 at $3,500.

Why pick the Reaction Audio PV-15X: A passive 15 inch ported subwoofer in a cinema style cabinet with strong output for home theater use, now discontinued. The tradeoff: Passive design requires a separate external amplifier and weighs 149.9 lbs (68 kg).
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 tradeoff: 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 passive 15 inch ported subwoofer in a cinema style cabinet with strong output for home theater use, now discontinued.
A 12 inch ported subwoofer with output close to far bigger flagships, a strong used pick now that it is discontinued.
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Specifications Side By Side
| Reaction Audio PV-15X | JTR Speakers Growler (2015) | |
|---|---|---|
| Price | $1,999 Passive, Discontinued | $2,995 Passive, Discontinued |
| Ranked | #22 of 143 in Large Home Subwoofers (Over 75 lbs) | #13 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, rear | ported, front |
| Output SPL at 15 Hz | 105.3 dB | - |
| Output SPL at 20 Hz | 111.3 dB | 92.8 dB |
| Output SPL at 25 Hz | 116.1 dB | 97.2 dB |
| Output SPL at 31.5 Hz | 119.8 dB | 106.6 dB |
| Output SPL at 40 Hz | 125.3 dB | 122.7 dB |
| Output SPL at 50 Hz | 126.8 dB | 130.0 dB |
| Output SPL at 63 Hz | 126.1 dB | 133.6 dB |
| Output SPL at 80 Hz | 126.5 dB | 134.4 dB |
| Output SPL at 100 Hz | 126.4 dB | 135.5 dB |
| Output SPL at 125 Hz | 126.1 dB | 136.0 dB |
| CEA-2010-A Average (40-80Hz) | 126.2 dB | 130.2 dB |
| Dimensions | 18”H x 22”W x 29”D (457.2 x 558.8 x 736.6 mm) | 22.5”H x 30”W x 20”D (571.5 x 762.0 x 508.0 mm) |
| Measurement Source | Data-bass | Data-bass |
| Weight | 149.9 lbs (68 kg) | 100.1 lbs (45.4 kg) |
| Drivers | 15” (381mm) driver | 12” (305mm) driver |
| Passive | Yes | Yes |
| Country | - | United States |
| Warranty | - | 5 years |
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