Short answer: both are discontinued, so this only matters if you are buying used. Used, the Klipsch R-115SW is the better pick: it ranks #72 of 143 subwoofers by sound quality (rated 4.2/5), against #116 (rated 3.9/5) for the Monoprice Monolith M-210. If you want one new, the HSU Research VTF-3 MK5 HP ranks #59 at $1,049.
The Klipsch R-115SW is the better-sounding pick. An affordable 15 inch ported subwoofer with strong upper bass punch for movie effects and music. The tradeoff: 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 case for the Monoprice Monolith M-210: A tall dual 10 inch ported subwoofer with strong upper bass for movies and music, 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.
Buy the Klipsch R-115SW only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, start with the HSU Research VTF-3 MK5 HP instead.
Want more options? Browse the full Subwoofers rankings.
An affordable 15 inch ported subwoofer with strong upper bass punch for movie effects and music.
A tall dual 10 inch ported subwoofer with strong upper bass for movies and music, now discontinued.
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Specifications Side By Side
| Klipsch R-115SW | Monoprice Monolith M-210 | |
|---|---|---|
| Price | $799 Discontinued | $1,300 Discontinued |
| Ranked | #72 of 143 in Large Home Subwoofers (Over 75 lbs) | #116 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Output SPL at 20 Hz | 108.7 dB | 101.4 dB |
| Output SPL at 25 Hz | 113.8 dB | 107.6 dB |
| Output SPL at 31.5 Hz | 118.6 dB | 110.1 dB |
| Output SPL at 40 Hz | 121.4 dB | 113.6 dB |
| Output SPL at 50 Hz | 124.7 dB | 122.9 dB |
| Output SPL at 63 Hz | 123.3 dB | 115.5 dB |
| CEA-2010-A Average (40-80Hz) | 123.1 dB (avg of 3/4 bands) | 117.5 dB |
| Dimensions | 21.5”H x 19.5”W x 22.3”D (546.1 x 495.3 x 566.4 mm) | 36.4”H x 17.7”W x 23.6”D (924.6 x 449.6 x 599.4 mm) |
| Weight | 75.4 lbs (34.2 kg) | 162 lbs (73.5 kg) |
| Warranty | 5/2 | 5 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | Brent Butterworth |
| Drivers | 15” (381mm) driver | 2x 10” (254mm) drivers |
| Output SPL at 15 Hz | - | 95.6 dB |
| Output SPL at 80 Hz | - | 118.2 dB |
| Output SPL at 100 Hz | - | 118.3 dB |
| Output SPL at 125 Hz | - | 119.6 dB |
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