Short answer: both are discontinued, and they are rated the same for sound quality (#71 and #69 of 143 subwoofers). Either one is only an option used, so choose on condition and price. If you want one new, the SVS PB-5000 R-Evolution replaces the SVS PB-4000 and is rated 4.2/5 at $2,599.
Buy the Monoprice Monolith M-15 V2 or the SVS PB-4000, whichever you find used in better condition; both are discontinued. For a new speaker, buy the SVS PB-5000 R-Evolution, which replaces the SVS PB-4000.
Still deciding? The full Subwoofers rankings cover every ranked option.
Published CEA-2010 specifications list 112.6 dB at 20 Hz and 120.0 dB through 40-80 Hz.
eBay
Independent CEA-2010 testing records 115.3 dB at 20 Hz and 120.3 dB through 40-80 Hz.
Amazon $2,158.97 eBayPrices on this page were last checked October 15, 2026 at 5:41 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Monoprice Monolith M-15 V2 | SVS PB-4000 | |
|---|---|---|
| Price | $1,500 Discontinued | $2,158.97 Discontinued |
| Ranked | #71 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 | 91.0 dB | - |
| Output SPL at 15 Hz | 106.3 dB | 102.1 dB |
| Output SPL at 20 Hz | 112.6 dB | 115.3 dB |
| Output SPL at 25 Hz | 116.6 dB | 116.3 dB |
| Output SPL at 31.5 Hz | 119.5 dB | 117.8 dB |
| Output SPL at 40 Hz | 120.9 dB | 119.8 dB |
| Output SPL at 50 Hz | 120.6 dB | 121.7 dB |
| Output SPL at 63 Hz | 120.0 dB | 120.7 dB |
| Output SPL at 80 Hz | 118.7 dB | 119.2 dB |
| Output SPL at 100 Hz | 120.1 dB | 118.1 dB |
| Output SPL at 125 Hz | 120.2 dB | 117.5 dB |
| CEA-2010-A Average (40-80Hz) | 120.0 dB | 120.3 dB |
| Dimensions | 28.7”H x 17.7”W x 26.8”D (729.0 x 449.6 x 680.7 mm) | 23.4”H x 20.5”W x 27.7”D (594.4 x 520.7 x 703.6 mm) |
| Weight | 132.9 lbs (60.3 kg) | 153.2 lbs (69.5 kg) |
| Warranty | 5 | 5 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Manufacturer | Audioholics |
| Drivers | 15” (381mm) driver | 13.5” (343mm) driver with ported design |
| Inputs | XLR, RCA | XLR (balanced), 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 |
Related Speaker Comparisons
More worthwhile head-to-heads for SVS PB-4000: