Short answer: the Monoprice Monolith M-215, if you are buying new. The Harbinger V2218S ranks higher than it (#15 vs #24 of 143 subwoofers, 4.5/5 vs 4.4/5) but is discontinued, so only consider it used; the Monoprice Monolith M-215 is still sold new at $2,999.99.
What the Harbinger V2218S does well: A pro style 18 inch ported subwoofer with hard hitting upper bass for movie effects and music, relatively light for its output. 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.
What the Monoprice Monolith M-215 does well: 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, since the Harbinger V2218S is discontinued and only worth hunting down used.
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A pro style 18 inch ported subwoofer with hard hitting upper bass for movie effects and music, relatively light for its output.
A dual 15 inch ported subwoofer with excellent output down to the lowest notes, a strong value for large home theaters.
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Specifications Side By Side
| Harbinger V2218S | Monoprice Monolith M-215 | |
|---|---|---|
| Price | $3,495 Discontinued | $2999.99 |
| Ranked | #15 of 143 in Large Home Subwoofers (Over 75 lbs) | #24 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Output SPL at 20 Hz | 81.7 dB | 118.9 dB |
| Output SPL at 25 Hz | 99.7 dB | 122.6 dB |
| Output SPL at 31.5 Hz | 118.0 dB | 125.2 dB |
| Output SPL at 40 Hz | 122.8 dB | 126.4 dB |
| Output SPL at 50 Hz | 129.0 dB | 126.1 dB |
| Output SPL at 63 Hz | 132.2 dB | 125.6 dB |
| Output SPL at 80 Hz | 131.7 dB | 125.6 dB |
| CEA-2010-A Average (40-80Hz) | 128.9 dB | 125.9 dB |
| Dimensions | 32.5”H x 26.5”W x 29.7”D (825.5 x 673.1 x 754.4 mm) | 42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm) |
| Weight | 89.9 lbs (40.8 kg) | 216.1 lbs (98.0 kg) |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | Brent Butterworth |
| Drivers | 18” (457mm) driver | 2x 15” (381mm) drivers |
| Output SPL at 12.5 Hz | - | 103.9 dB |
| Output SPL at 15 Hz | - | 113.1 dB |
| Output SPL at 100 Hz | - | 125.7 dB |
| Output SPL at 125 Hz | - | 126.3 dB |
| Warranty | - | 5 |
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