Monoprice
Monoprice 142847 Monolith M-12 V2 12" THX Subwoofer
★★★★★
500W
Experience Deep, Room-Shaking Bass with THX Certified Performance Introducing the Monolith M-12 V2 12-Inch THX Certified Ultra Powered Subwoofer. Designed for home theater enthusiasts, this subwoofer delivers low distortion, high power output, and exceptional bass response down to well under 20Hz...
$1,109.99*
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*Price sourced from Amazon.com. Last updated:Jun 28, 2026.Price and availability are subject to change.
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Overview
Experience Deep, Room-Shaking Bass with THX Certified Performance
Introducing the Monolith M-12 V2 12-Inch THX Certified Ultra Powered Subwoofer. Designed for home theater enthusiasts, this subwoofer delivers low distortion, high power output, and exceptional bass response down to well under 20Hz.
Specifications:
- Brand: Monoprice
- Model: 142847
- Woofer Size: 12-Inch
- Certification: THX Certified Ultra
- Amplifier Power: 500 Watt RMS (900 Watts Peak)
- Cabinet Type: Vented HDF Cabinet
- Inputs: RCA and XLR
- Finish: Black Ash
Key Features
THX Certified Ultra: THX engineers completed hundreds of different scientific tests to ensure the highest audio performance possible. The tests ensure the speaker can reach the high volumes necessary to achieve THX Reference Level without creating audible distortion or artifacts. THX Certified Ultra products are for large sized rooms, up to 3,000 cubic feet in size, with a 10‑12 foot viewing distance from the screen.
12" Woofer: The Monolith 12" driver was developed from the ground up, with a design focus on achieving output, accuracy, dynamics, and linearity, while minimizing distortion. Enclosed in a cabinet made from HDF material, massive internal bracing, and outfitted with two ports that can utilize foam plugs to run the subwoofer in a sealed mode.
500 Watt Amplifier: The 500W RMS amplifier is built around a Texas Instruments 48‑bit data path (with 28‑bit filter coefficients) and DSP engine. Each amplifier's transfer function, power output limiting, and thermal protection are monitored to the millisecond and are customized for each individual driver. The high efficiency Class D amplifier modules are based on a proven topology that has been continuously refined over the past 4 years. The amplifier has vast reserves of power for highly
Cabinet and Internal Bracing: HDF (High Density Fiberboard), not MDF, was utilized resulting in a sonically inert cabinet. Internal bracing has been strategically placed to increase overall cabinet strength and limit unwanted panel vibrations that would cause discoloration and distortion. The strong cabinet and bracing combine to ensure you hear massive amounts of bass, not cabinet resonances.
All Amp'd Up: The Monolith subwoofer amplifier has an extraordinarily high power output of 500 watts RMS (900 watts peak), which can deliver massive amounts of power when needed. Each Class D amplifier is built around a Texas Instruments 48 bit data path (with 28 bit filter coefficients) DSP engine, allowing virtually unlimited design flexibility with the assurance of no signal degradation.
Specifications
Certification
THX Certified Ultra
Woofer Size
12 inches
Amplifier Power (RMS)
500 watts
Amplifier Power (Peak)
900 watts
Amplifier Type
High efficiency Class D
DSP Engine
Texas Instruments 48‑bit data path (with 28‑bit filter coefficients)
Cabinet Material
HDF (High Density Fiberboard)
Room Size (THX Ultra)
Up to 3,000 cubic feet
Pros & Cons
👍 Pros
- This subwoofer is THX Certified Ultra, indicating it has passed rigorous tests for audio performance in large rooms up to 3,000 cubic feet.
- The 12-inch driver is custom-developed for output, accuracy, dynamics, and linearity while minimizing distortion, enhancing bass quality.
- A robust 500W RMS amplifier (900W peak) provides substantial power reserves for demanding audio, utilizing a Texas Instruments DSP engine.
- The cabinet is constructed from HDF (High Density Fiberboard), not MDF, resulting in a sonically inert enclosure that reduces unwanted vibrations.
- Internal bracing is strategically placed to increase overall cabinet strength, further ensuring clean, distortion-free bass.
👎 Cons
- The physical dimensions and weight of the subwoofer are not specified, which could impact placement and transportation.
- While THX Certified Ultra, specific frequency response ranges or crossover points are not provided for detailed audio integration planning.
- The power consumption of the 500W RMS Class D amplifier is not detailed, which might be a consideration for electricity usage.
- Information on connectivity options (e.g., LFE input, line-level inputs) is not explicitly listed, which is important for system integration.
- The aesthetic design of the subwoofer is not described, beyond the HDF cabinet material, which might be a factor for home theater integration.
Frequently Asked Questions
What does THX Certified Ultra mean for this subwoofer?
THX Certified Ultra means this subwoofer has undergone extensive scientific tests by THX engineers to ensure it delivers the highest possible audio performance for large rooms, up to 3,000 cubic feet, at reference listening levels without distortion.
What kind of driver is used in the Monolith M-12 V2 subwoofer?
The Monolith M-12 V2 features a custom-developed 12-inch driver, designed from the ground up to achieve high output, accuracy, dynamics, and linearity while minimizing distortion.
What is the power output of the amplifier in this subwoofer?
The subwoofer is equipped with a 500-watt RMS amplifier, capable of delivering up to 900 watts of peak power for robust audio performance.
How does the cabinet construction contribute to sound quality?
The cabinet is made from HDF (High Density Fiberboard) with massive internal bracing, which makes it sonically inert and minimizes unwanted panel vibrations that could cause discoloration and distortion in the bass output.
Can the subwoofer be configured in different modes?
Yes, the cabinet is outfitted with two ports that can utilize foam plugs, allowing the subwoofer to be run in a sealed mode in addition to its ported configuration.
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