Short answer: the Monoprice Monolith M-215. It ranks #24 of 143 subwoofers by sound quality (rated 4.4/5) at $2,999.99 and is still sold new; the SVS SB13-Plus ranks #142 (rated 3.3/5) and is discontinued, so it is only an option used.
Why pick the SVS SB13-Plus: A sealed 13 inch subwoofer with XLR and RCA inputs in a compact cube cabinet, now discontinued. Watch for: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority.
The Monoprice Monolith M-215 is the better-sounding option. A dual 15 inch ported subwoofer with excellent output down to the lowest notes, a strong value for large home theaters. The tradeoff: 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.
Buy the Monoprice Monolith M-215. It is rated higher for sound quality; the SVS SB13-Plus is no longer sold new.
Want more options? Browse the full Subwoofers rankings.
A sealed 13 inch subwoofer with XLR and RCA inputs in a compact cube cabinet, now discontinued.
A dual 15 inch ported subwoofer with excellent output down to the lowest notes, a strong value for large home theaters.
Prices on this page were last checked October 31, 2026 at 7:11 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
| SVS SB13-Plus | Monoprice Monolith M-215 | |
|---|---|---|
| Price | $1,399 Discontinued | $2999.99 |
| Ranked | #142 of 143 in Large Home Subwoofers (Over 75 lbs) | #24 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, front |
| Output SPL at 20 Hz | 92.3 dB | 118.9 dB |
| Output SPL at 25 Hz | 97.2 dB | 122.6 dB |
| Output SPL at 31.5 Hz | 97.2 dB | 125.2 dB |
| Output SPL at 40 Hz | 108.1 dB | 126.4 dB |
| Output SPL at 50 Hz | 108.1 dB | 126.1 dB |
| Output SPL at 63 Hz | 108.1 dB | 125.6 dB |
| CEA-2010-A Average (40-80Hz) | 108.1 dB (avg of 3/4 bands) | 125.9 dB |
| Dimensions | 17”H x 17”W x 18”D (431.8 x 431.8 x 457.2 mm) | 42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm) |
| Weight | 95 lbs (43.1 kg) | 216.1 lbs (98.0 kg) |
| Warranty | 5 | 5 |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | Brent Butterworth |
| Drivers | 13” (330mm) driver | 2x 15” (381mm) drivers |
| Inputs | XLR (balanced), RCA | - |
| 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 | - |
| Output SPL at 12.5 Hz | - | 103.9 dB |
| Output SPL at 15 Hz | - | 113.1 dB |
| Output SPL at 80 Hz | - | 125.6 dB |
| Output SPL at 100 Hz | - | 125.7 dB |
| Output SPL at 125 Hz | - | 126.3 dB |
| Cabinet Color | - | black |
Related Speaker Comparisons
More top alternatives to Monoprice Monolith M-215: