Short answer: the Monoprice Monolith M-215. Both are rated 4.4/5 for sound quality (#24 and #17 of 143 subwoofers), and the Monoprice Monolith M-215 costs $2,999.99 against $9,875 for the Funk Audio Classic 18.0, so with nothing between them on sound quality, price settles it.
The case for the Funk Audio Classic 18.0: A sealed 18 inch subwoofer with punchy, powerful upper bass for movie effects and music, with balanced daisy chain inputs. 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.
Why pick the Monoprice Monolith M-215: A dual 15 inch ported subwoofer with excellent output down to the lowest notes, a strong value for large home theaters. The catch: 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. Both are rated the same for sound quality, and it costs $6,875.01 less than the Funk Audio Classic 18.0.
Still deciding? The full Subwoofers rankings cover every ranked option.
A sealed 18 inch subwoofer with punchy, powerful upper bass for movie effects and music, with balanced daisy chain inputs.
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.
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Specifications Side By Side
| Funk Audio Classic 18.0 | Monoprice Monolith M-215 | |
|---|---|---|
| Price | $9,875 | $2999.99 |
| Ranked | #17 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 10 Hz | 94.6 dB | - |
| Output SPL at 12.5 Hz | 98.4 dB | 103.9 dB |
| Output SPL at 15 Hz | 102.3 dB | 113.1 dB |
| Output SPL at 20 Hz | 106.5 dB | 118.9 dB |
| Output SPL at 25 Hz | 111.7 dB | 122.6 dB |
| Output SPL at 31.5 Hz | 119.0 dB | 125.2 dB |
| Output SPL at 40 Hz | 124.6 dB | 126.4 dB |
| Output SPL at 50 Hz | 126.8 dB | 126.1 dB |
| Output SPL at 63 Hz | 128.4 dB | 125.6 dB |
| Output SPL at 80 Hz | 129.6 dB | 125.6 dB |
| Output SPL at 100 Hz | 130.2 dB | 125.7 dB |
| Output SPL at 125 Hz | 130.8 dB | 126.3 dB |
| CEA-2010-A Average (40-80Hz) | 127.3 dB | 125.9 dB |
| Dimensions | 22.5”H x 22”W x 20.5”D (571.5 x 558.8 x 520.7 mm) | 42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm) |
| Weight | 115.1 lbs (52.2 kg) | 216.1 lbs (98.0 kg) |
| Warranty | 3 | 5 |
| Cabinet Color | wood, custom | black |
| Country | Canada | United States |
| Measurement Source | Data-bass | Brent Butterworth |
| Drivers | 18” (457mm) driver | 2x 15” (381mm) drivers |
| Inputs | XLR (balanced, with daisy-chain) | - |
| XLR Input | Yes | - |
| RCA Input | No | - |
| TRS Input | No | - |
| Optical Input | No | - |
| Coaxial Input | No | - |
| USB Input | No | - |
| HDMI Input | No | - |
| AES Input | No | - |
| Aux Input | No | - |
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