Short answer: the Monoprice Monolith 16 THX Ultra, since it edges the PV-15X on output and needs no separate amp. The 16-inch ported driver and THX Ultra certification deliver a 126.5dB CEA-2010-A average against the PV-15X’s 126.2dB, though it is heavy at 78 kg (172 lbs) and its ported design can interact with room acoustics. The Reaction Audio PV-15X is passive, so it requires a separate external amplifier, and it weighs 68 kg (149.9 lbs).
Buy the Monoprice Monolith 16 THX Ultra or the Reaction Audio PV-15X, whichever you find used in better condition; both are discontinued.
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
| Monoprice Monolith 16 THX Ultra | Reaction Audio PV-15X | |
|---|---|---|
| Price | $2,300 Discontinued | $1,999 Passive, Discontinued |
| Ranked | #19 of 143 in Large Home Subwoofers (Over 75 lbs) | #22 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, rear |
| Output SPL at 15 Hz | 107.3 dB | 105.3 dB |
| Output SPL at 20 Hz | 118.4 dB | 111.3 dB |
| Output SPL at 25 Hz | 123.3 dB | 116.1 dB |
| Output SPL at 31.5 Hz | 125.1 dB | 119.8 dB |
| Output SPL at 40 Hz | 126.3 dB | 125.3 dB |
| Output SPL at 50 Hz | 126.5 dB | 126.8 dB |
| Output SPL at 63 Hz | 126.6 dB | 126.1 dB |
| Output SPL at 80 Hz | 126.8 dB | 126.5 dB |
| Output SPL at 100 Hz | 127.2 dB | 126.4 dB |
| Output SPL at 125 Hz | 127.6 dB | 126.1 dB |
| CEA-2010-A Average (40-80Hz) | 126.5 dB | 126.2 dB |
| Dimensions | 25.6”H x 22”W x 28.1”D (650.2 x 558.8 x 713.7 mm) | 18”H x 22”W x 29”D (457.2 x 558.8 x 736.6 mm) |
| Weight | 171.5 lbs (77.8 kg) | 149.9 lbs (68 kg) |
| Warranty | 5 | - |
| Cabinet Color | black | - |
| Country | United States | - |
| Measurement Source | Audioholics | Data-bass |
| Drivers | 16” (406mm) driver | 15” (381mm) driver |
| Inputs | XLR, RCA, XLR out | - |
| 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 |
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