Monoprice
Monolith 12-inch THX Ultra Powered Subwoofer
Best high-performance subwoofer for serious home theater enthusiasts.
Experience deep, impactful low-frequency reproduction with the Monolith 12-inch THX Ultra Powered Subwoofer from Monoprice. Engineered for accuracy and massive output, this subwoofer is built to handle demanding home theater and music applications. It features a robust 12-inch driver capable of producing authoritative bass down to 17 Hz. The integrated amplifier delivers substantial power, ensuring dynamic headroom for complex soundtracks and music scores. Its substantial build and THX Ultra certification confirm its capability to fill large rooms with precise, distortion-free low-end performance.
$1799.99
Owner Satisfaction
4.8
/ 5
Category Rank
151
/ 6568
#151 in Speakers
Price vs Category Average
+23%
Above average
Driver Size
12
/ inches
Who it's for
- Home theater enthusiasts demanding professional-grade cinema sound quality
- Bass lovers seeking deep, room-shaking low-frequency performance
- Budget-conscious shoppers wanting high-end audio without the premium price
Who should skip it
- Interior designers needing compact equipment for smaller living spaces
- Solo homeowners who struggle with moving heavy, bulky furniture
- Tech-savvy users requiring app-based controls and advanced digital tuning
Performance breakdown
Low Frequency Extension
Reaches down to 17 Hz for truly visceral, room-shaking cinematic impact.
Output Authority
Delivers massive, distortion-free volume that easily fills large home theater spaces.
Build Integrity
Heavyweight construction ensures the cabinet remains inert during high-excursion playback.
Transient Response
The driver reacts with impressive speed for tight, articulate musical bass.
Connectivity Versatility
XLR and RCA inputs provide flexible integration for professional-grade audio systems.
Dynamic Headroom
The high-power amplifier handles sudden, complex sound peaks without breaking a sweat.
Key Specs
Driver Size
12 inches
Power Output
500W RMS / 1000W Peak
Frequency Response
17 Hz - 200 Hz
Connectivity
RCA (LFE/Line Level), XLR
Dimensions
17.7 x 17.7 x 21.7 inches
Weight
101.4 lbs
Number of Drivers
1
Color
Black
Features
- THX Ultra certified for reference performance
- Delivers powerful, distortion-free low frequencies
- Integrated high-power amplifier for dynamic headroom
- Designed for accurate home theater integration
- Robust 12-inch driver handles high excursion
- Versatile connectivity options for various setups
What customers say
Customers overwhelmingly praise the Monolith 12-inch subwoofer for its exceptional performance and value. The core theme is its authoritative, deep bass output, which many feel surpasses much more expensive units. Its THX Ultra certification assures users of reference quality and low distortion, making it perfect for serious home theater fans needing powerful LFE. Reviewers appreciate the robust, heavy build quality that supports the clean, powerful sound. While its size presents minor placement challenges, this is seen as an acceptable trade-off for the immense cinematic impact delivered. The consensus is that this subwoofer offers unparalleled performance for the price, significantly elevating the viewing experience.
Know before you buy
THX Ultra certification ensures the subwoofer meets rigorous standards for output levels and low-distortion performance in large rooms. It guarantees that the unit can reach reference volume levels without audible artifacts, providing a cinema-like experience at home.
Yes, the Monolith 12-inch is specifically engineered for large spaces. With 500W RMS power and a frequency response reaching down to 17 Hz, it is designed to pressurize larger rooms effectively while maintaining accuracy.
You can connect the subwoofer using either the RCA LFE input or the balanced XLR input. The XLR option is particularly useful if you have a long cable run, as it helps minimize potential noise interference.
It is designed to excel at both. The high-excursion 12-inch driver provides the speed and precision required for musical transients, while the massive power output handles the deep, demanding low-frequency effects found in modern film soundtracks.
The subwoofer measures 17.7 x 17.7 x 21.7 inches and weighs over 100 pounds. You will need a sturdy, dedicated spot on your floor to accommodate its footprint and substantial mass.
Still have a question?
Ask Hayley anything about this product before you decide.
Ready to buy?
$1800