Short answer: the Monoprice Monolith M-215. It ranks #24 of 143 subwoofers by sound quality (rated 4.4/5) at $1,499.99 and is still sold new; the SVS PB-4000 ranks #69 (rated 4.2/5) and is discontinued, so it is only an option used. The SVS PB-4000’s replacement, the SVS PB-5000 R-Evolution, is rated 4.2/5 at $2,399.
Buy the Monoprice Monolith M-215. It is rated higher for sound quality and still sold new, while the SVS PB-4000 is discontinued.
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 PB-4000 | |
|---|---|---|
| Price | $1,499.99 | $2,158.97 Discontinued |
| Ranked | #24 of 143 in Large Home Subwoofers (Over 75 lbs) | #69 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Output SPL at 12.5 Hz | 103.9 dB | - |
| Output SPL at 15 Hz | 113.1 dB | 102.1 dB |
| Output SPL at 20 Hz | 118.9 dB | 115.3 dB |
| Output SPL at 25 Hz | 122.6 dB | 116.3 dB |
| Output SPL at 31.5 Hz | 125.2 dB | 117.8 dB |
| Output SPL at 40 Hz | 126.4 dB | 119.8 dB |
| Output SPL at 50 Hz | 126.1 dB | 121.7 dB |
| Output SPL at 63 Hz | 125.6 dB | 120.7 dB |
| Output SPL at 80 Hz | 125.6 dB | 119.2 dB |
| Output SPL at 100 Hz | 125.7 dB | 118.1 dB |
| Output SPL at 125 Hz | 126.3 dB | 117.5 dB |
| CEA-2010-A Average (40-80Hz) | 125.9 dB | 120.3 dB |
| Dimensions | 42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm) | 23.4”H x 20.5”W x 27.7”D (594.4 x 520.7 x 703.6 mm) |
| Weight | 216.1 lbs (98.0 kg) | 153.2 lbs (69.5 kg) |
| Warranty | 5 | 5 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | Audioholics |
| Drivers | 2x 15” (381mm) drivers | 13.5” (343mm) driver with ported design |
| Inputs | - | XLR (balanced), 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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