The Monoprice Monolith 15 THX Ultra ranks #50 out of 97 total Large Powered Home Subwoofers (Over 75 lbs) for sound quality. See Top Recommended Speakers By Attribute for all the top speaker suggestions.
#50 Monoprice Monolith 15 THX Ultra: $1999
Notes: Product # 24458
How it compares: Just above it: Epik Subwoofers Empire - $4996 more. Just below it: Klipsch RP-1600SW - $1 more.
| CEA-2010-A Average (40-80Hz) | 120.5 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 26.8"H x 17.7"W x 27.6"D (680.7 x 449.6 x 701.0 mm) |
| Driver | 15" (381mm) driver |
| Driver(s) | (1) 15 inch |
| Enclosure | ported, front |
| Measurement Source | ErinsAudioCorner |
| Output SPL at 12.5 Hz | 90.0 dB |
| Output SPL at 15 Hz | 100.8 dB |
| Output SPL at 20 Hz | 110.0 dB |
| Output SPL at 25 Hz | 115.6 dB |
| Output SPL at 31.5 Hz | 118.0 dB |
| Output SPL at 40 Hz | 122.0 dB |
| Output SPL at 50 Hz | 121.0 dB |
| Output SPL at 63 Hz | 120.0 dB |
| Output SPL at 80 Hz | 119.0 dB |
| Output SPL at 100 Hz | 119.0 dB |
| Output SPL at 125 Hz | 118.0 dB |
| Warranty | 5 |
| Weight | 128.5 lbs / 58.3 kg |
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Product prices and availability were last checked July 31, 2026 at 5:30 AM UTC 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.