The Monoprice THX 121456 ranks #96 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.
#96 Monoprice THX 121456: $899
Notes: Product # 121456
How it compares: Just above it: SVS SB13-Plus - $500 more. Just below it: Sonus Faber Gravis VI - $7080 more, 1.7dB less max output.
| CEA-2010-A Average (40-80Hz) | 108.0 dB |
|---|---|
| Country | United States |
| Dimensions | 0.0"H x 0.0"W x 0.0"D (0.0 x 0.0 x 0.0 mm) |
| Driver | 12" driver |
| Measurement Source | Brent Butterworth |
| Output SPL at 15 Hz | 92.0 dB |
| Output SPL at 20 Hz | 94.6 dB |
| Output SPL at 25 Hz | 100.1 dB |
| Output SPL at 31.5 Hz | 103.2 dB |
| Output SPL at 40 Hz | 104.7 dB |
| Output SPL at 50 Hz | 107.3 dB |
| Output SPL at 63 Hz | 109.3 dB |
| Output SPL at 80 Hz | 110.5 dB |
| Weight | 98.5 lbs / 44.7 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.