Short answer: the Monoprice Monolith M-215. It ranks #24 of 143 subwoofers by sound quality, rated 4.4/5, at $1,499.99; the SVS PB17-Ultra R-Evolution ranks #86, rated 4.1/5, and costs $2,999, which makes this an easy call rather than a real tradeoff.
The Monoprice Monolith M-215 is the better-sounding choice. A dual 15 inch ported subwoofer with excellent output down to the lowest notes, a strong value for large home theaters. Watch for: The 1074.4H x 508.0W x 701.0D mm cabinet and 216.1 lbs (98.0 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 tradeoff: 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 Monoprice Monolith M-215. It is rated higher for sound quality than the SVS PB17-Ultra R-Evolution and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Subwoofers rankings cover every ranked option.
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 M-215 | SVS PB17-Ultra R-Evolution | |
|---|---|---|
| Price | $1,499.99 | $2,999.00 |
| Ranked | #24 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 | 103.9 dB | 90.7 dB |
| Output SPL at 15 Hz | 113.1 dB | - |
| Output SPL at 20 Hz | 118.9 dB | 113.9 dB |
| Output SPL at 25 Hz | 122.6 dB | 117.5 dB |
| Output SPL at 31.5 Hz | 125.2 dB | 119.4 dB |
| Output SPL at 40 Hz | 126.4 dB | 120.1 dB |
| Output SPL at 50 Hz | 126.1 dB | 119.7 dB |
| Output SPL at 63 Hz | 125.6 dB | 119.0 dB |
| Output SPL at 80 Hz | 125.6 dB | 118.7 dB |
| Output SPL at 100 Hz | 125.7 dB | 119.8 dB |
| Output SPL at 125 Hz | 126.3 dB | - |
| CEA-2010-A Average (40-80Hz) | 125.9 dB | 119.4 dB |
| Dimensions | 42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm) | 20”H x 19.5”W x 21.2”D (508.0 x 495.3 x 538.5 mm) |
| Weight | 216.1 lbs (98.0 kg) | 166.9 lbs (75.7 kg) |
| Warranty | 5 | - |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | Audioholics |
| Drivers | 2x 15” (381mm) drivers | 17” driver, dual voice coil |
| 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 |
| Inputs | - | XLR (balanced, LFE/stereo), RCA (LFE/stereo) |
| 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 |
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