Short answer: the Monoprice Monolith M-215. It ranks #24 of 143 subwoofers by sound quality, rated 4.4/5, at $1,799.99; the SVS SB17-Ultra R-Evolution ranks #102, rated 4.1/5, and costs $2,699, which makes this an easy call rather than a real tradeoff.
The case for the SVS SB17-Ultra R-Evolution: A flagship sealed 17 inch subwoofer with a very powerful amplifier, app control and automatic room calibration. The catch: No independent measurements yet, so its output can’t be compared with ranked subwoofers.
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. 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.
Buy the Monoprice Monolith M-215. It is rated higher for sound quality than the SVS SB17-Ultra R-Evolution and costs less, which makes it the one to get unless you need something the other one does better.
About the ratings: the SVS SB17-Ultra R-Evolution’s rating is estimated from measured siblings and predecessors rather than its own measurements, with a likely range of 3.9 to 4.3, so this verdict could change once it is measured.
Still deciding? The full Subwoofers rankings cover every ranked option.
Prices on this page were last checked November 14, 2026 at 6:17 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 SB17-Ultra R-Evolution | Monoprice Monolith M-215 | |
|---|---|---|
| Price | $2,699.00 | $1,799.99 |
| Ranked | #102 of 143 in Large Home Subwoofers (Over 75 lbs) Estimated | #24 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Weight | 124 lbs (56.25 kg) | 216.1 lbs (98.0 kg) |
| Dimensions | 20”H x 19.5”W x 21.1”D (507 x 495 x 537 mm) | 42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm) |
| Enclosure | sealed | ported, front |
| Drivers | 17” driver, dual 8” voice coils | 2x 15” (381mm) drivers |
| Amplifier Power | 2800W RMS | - |
| Frequency Response | 15Hz extension (manufacturer specified) | - |
| Cabinet Color | Piano Gloss Black, Black Oak Veneer | black |
| Country | United States | United States |
| Output SPL at 12.5 Hz | - | 103.9 dB |
| Output SPL at 15 Hz | - | 113.1 dB |
| Output SPL at 20 Hz | - | 118.9 dB |
| Output SPL at 25 Hz | - | 122.6 dB |
| Output SPL at 31.5 Hz | - | 125.2 dB |
| Output SPL at 40 Hz | - | 126.4 dB |
| Output SPL at 50 Hz | - | 126.1 dB |
| Output SPL at 63 Hz | - | 125.6 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 |
| CEA-2010-A Average (40-80Hz) | - | 125.9 dB |
| Warranty | - | 5 |
| Measurement Source | - | Brent Butterworth |
Where the Ratings Come From
- SVS SB17-Ultra R-Evolution: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
- Monoprice Monolith M-215: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
Related Speaker Comparisons
More worthwhile head-to-heads for Monoprice Monolith M-215: