Short answer: the Funk Audio Ultra 24.0 on measured sound quality, the Monoprice Monolith M-215 on price. The Funk Audio Ultra 24.0 ranks #11 of 143 subwoofers, rated 4.5/5, at $18,565. The Monoprice Monolith M-215 ranks #24, rated 4.4/5, at $2,999.99, $15,565.01 cheaper.
What the Funk Audio Ultra 24.0 does well: A sealed 24 inch subwoofer with massive, very deep bass output for large rooms, built to order as a luxury cinema centerpiece. Watch for: The 787.4H x 660.4W x 609.6D mm cabinet and 297.6 lbs (135 kg) mass make this a serious placement and moving commitment.
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 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 Funk Audio Ultra 24.0 if sound quality is the priority over the price, or the Monoprice Monolith M-215 if the price is the priority over sound quality.
Looking for alternatives? See the complete Subwoofers rankings.
A sealed 24 inch subwoofer with massive, very deep bass output for large rooms, built to order as a luxury cinema centerpiece.
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 Ultra 24.0 | Monoprice Monolith M-215 | |
|---|---|---|
| Price | $18,565 | $2999.99 |
| Ranked | #11 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 | 101.0 dB | - |
| Output SPL at 12.5 Hz | 104.9 dB | 103.9 dB |
| Output SPL at 15 Hz | 111.8 dB | 113.1 dB |
| Output SPL at 20 Hz | 120.0 dB | 118.9 dB |
| Output SPL at 25 Hz | 122.0 dB | 122.6 dB |
| Output SPL at 31.5 Hz | 123.0 dB | 125.2 dB |
| Output SPL at 40 Hz | 127.1 dB | 126.4 dB |
| Output SPL at 50 Hz | 129.9 dB | 126.1 dB |
| Output SPL at 63 Hz | 127.6 dB | 125.6 dB |
| Output SPL at 80 Hz | 127.0 dB | 125.6 dB |
| Output SPL at 100 Hz | 128.2 dB | 125.7 dB |
| CEA-2010-A Average (40-80Hz) | 127.9 dB | 125.9 dB |
| Dimensions | 31”H x 26”W x 24”D (787.4 x 660.4 x 609.6 mm) | 42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm) |
| Warranty | 3 | 5 |
| Cabinet Color | wood, custom | black |
| Country | Canada | United States |
| Measurement Source | Manufacturer | Brent Butterworth |
| Weight | 297.6 lbs (135 kg) | 216.1 lbs (98.0 kg) |
| Drivers | 24” (610mm) driver | 2x 15” (381mm) drivers |
| Inputs | XLR (balanced) | - |
| 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 | - |
| Output SPL at 125 Hz | - | 126.3 dB |
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