Short answer: the SVS PB12-Plus, if you are buying new. The Monoprice Monolith 16 THX Ultra ranks higher than it (#19 vs #112 of 143 subwoofers, 4.4/5 vs 3.9/5) but is discontinued, so only consider it used; the SVS PB12-Plus is still sold new at $1,399.99.
The Monoprice Monolith 16 THX Ultra is the better-sounding option. A THX Ultra certified 16 inch ported subwoofer with huge output for far less money than most rivals, now worth finding used. Watch for: Heavy at 172 lbs (78 kg) and ported design can interact with room acoustics.
The case for the SVS PB12-Plus: A large front ported 12 inch subwoofer with strong deep bass for movies in a big room, plus XLR and RCA inputs. Watch for: The 558.8H x 502.9W x 675.6D mm cabinet and 127 lbs (57.6 kg) mass make this a serious placement and moving commitment.
Buy the SVS PB12-Plus new; the Monoprice Monolith 16 THX Ultra is no longer sold new, so it only makes sense as a used find.
Want more options? Browse the full Subwoofers rankings.
A THX Ultra certified 16 inch ported subwoofer with huge output for far less money than most rivals, now worth finding used.
A large front ported 12 inch subwoofer with strong deep bass for movies in a big room, plus XLR and RCA inputs.
Prices on this page were last checked October 29, 2026 at 4:42 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 | SVS PB12-Plus | |
|---|---|---|
| Price | $2,300 Discontinued | $1,399.99 |
| Ranked | #19 of 143 in Large Home Subwoofers (Over 75 lbs) | #112 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Output SPL at 15 Hz | 107.3 dB | - |
| Output SPL at 20 Hz | 118.4 dB | 110.0 dB |
| Output SPL at 25 Hz | 123.3 dB | 112.5 dB |
| Output SPL at 31.5 Hz | 125.1 dB | 114.5 dB |
| Output SPL at 40 Hz | 126.3 dB | 117.3 dB |
| Output SPL at 50 Hz | 126.5 dB | 118.3 dB |
| Output SPL at 63 Hz | 126.6 dB | 118.3 dB |
| Output SPL at 80 Hz | 126.8 dB | - |
| Output SPL at 100 Hz | 127.2 dB | - |
| Output SPL at 125 Hz | 127.6 dB | - |
| CEA-2010-A Average (40-80Hz) | 126.5 dB | 118.0 dB (avg of 3/4 bands) |
| Dimensions | 25.6”H x 22”W x 28.1”D (650.2 x 558.8 x 713.7 mm) | 22”H x 19.8”W x 26.6”D (558.8 x 502.9 x 675.6 mm) |
| Weight | 171.5 lbs (77.8 kg) | 127 lbs (57.6 kg) |
| Warranty | 5 | 5 |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Audioholics | Audioholics |
| Drivers | 16” (406mm) driver | 12” (305mm) driver with ported design |
| Inputs | XLR, RCA, XLR out | XLR (balanced), RCA (stereo) |
| 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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