Short answer: the SVS PB17-Ultra R-Evolution, if you are buying new. The Monoprice Monolith 13 THX Ultra ranks higher than it (#63 vs #86 of 143 subwoofers, 4.2/5 vs 4.1/5) but is discontinued, so only consider it used; the SVS PB17-Ultra R-Evolution is still sold new at $2,999.
What the Monoprice Monolith 13 THX Ultra does well: A THX Ultra certified 13 inch ported subwoofer with deep, strong bass for large rooms at a good price used. The tradeoff: The 604.5H x 515.6W x 739.1D mm cabinet and 153.2 lbs (69.5 kg) mass make this a serious placement and moving commitment.
Why pick the SVS PB17-Ultra R-Evolution: A giant ported 17 inch subwoofer that digs extremely deep and plays earth shaking movie bass in large rooms. The catch: At 166.9 lbs (75.7 kg), or 167 lbs (75.8 kg), with recessed feet that leave little clearance, moving or repositioning this cabinet is a two-person job at minimum.
Buy the SVS PB17-Ultra R-Evolution, since the Monoprice Monolith 13 THX Ultra is discontinued and only worth hunting down used.
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 13 THX Ultra | SVS PB17-Ultra R-Evolution | |
|---|---|---|
| Price | $1,700 Discontinued | $2,999.00 |
| Ranked | #63 of 143 in Large Home Subwoofers (Over 75 lbs) | #86 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, bottom |
| Output SPL at 12.5 Hz | 94.0 dB | 90.7 dB |
| Output SPL at 15 Hz | 109.1 dB | - |
| Output SPL at 20 Hz | 115.0 dB | 113.9 dB |
| Output SPL at 25 Hz | 118.0 dB | 117.5 dB |
| Output SPL at 31.5 Hz | 119.5 dB | 119.4 dB |
| Output SPL at 40 Hz | 120.3 dB | 120.1 dB |
| Output SPL at 50 Hz | 120.7 dB | 119.7 dB |
| Output SPL at 63 Hz | 121.4 dB | 119.0 dB |
| Output SPL at 80 Hz | 122.1 dB | 118.7 dB |
| Output SPL at 100 Hz | 122.7 dB | 119.8 dB |
| Output SPL at 125 Hz | 123.8 dB | - |
| CEA-2010-A Average (40-80Hz) | 121.1 dB | 119.4 dB |
| Dimensions | 23.8”H x 20.3”W x 29.1”D (604.5 x 515.6 x 739.1 mm) | 20”H x 19.5”W x 21.2”D (508.0 x 495.3 x 538.5 mm) |
| Weight | 153.2 lbs (69.5 kg) | 166.9 lbs (75.7 kg) |
| Warranty | 5 | - |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Audioholics | Audioholics |
| Drivers | 13” (330mm) driver | 17” driver, dual voice coil |
| Inputs | XLR (stereo balanced), RCA (stereo/mono) | XLR (balanced, LFE/stereo), RCA (LFE/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 |
| Output SPL at 10 Hz | - | 76.7 dB |
| Output SPL at 16 Hz | - | 107.0 dB |
| Frequency Response | - | 15-320Hz, ±3dB |
| Amplifier Power | - | 2800W RMS |
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