Monoprice

Monoprice 141496 Monolith 13" THX Ultra Subwoofer

4.1 (16 reviews)
13 Inch

Experience Deep Bass Like Never Before with the Monolith Subwoofer The Monolith 13" THX Ultra Certified Powered Subwoofer redefines bass performance for studio and home theater systems. With a newly designed 13-inch driver and a powerful 2000-watt amplifier, this subwoofer delivers massive output...

$1,747.76*
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*Price sourced from Amazon.com. Last updated:Jun 27, 2026.Price and availability are subject to change.

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Overview

Experience Deep Bass Like Never Before with the Monolith Subwoofer

The Monolith 13" THX Ultra Certified Powered Subwoofer redefines bass performance for studio and home theater systems. With a newly designed 13-inch driver and a powerful 2000-watt amplifier, this subwoofer delivers massive output, low distortion, and reference-level bass. Perfect for large rooms, this subwoofer brings cinematic sound to your home.

Specifications:

  • Woofer Size: 13 Inches
  • Amplifier Power: 2000 Watt (RMS) / 3800+ Watt (Peak)
  • Certification: THX Ultra Certified
  • Enclosure Material: High Density Fiberboard (HDF)
  • Driver Material: Long Fiber Pulp/Glass Fiber
  • Room Size: Large Rooms (up to 3,000 cubic feet)
  • Connectivity: Wired
  • Dimensions: 29.1"D x 20.3"W x 23.8"H
  • Weight: 100 Pounds

Key Features

THX Ultra Certified: 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 Ultra Certified products are designed for large rooms, up to 3,000 cubic feet in size, with a 10~12 foot viewing distance from the screen.

13 Inch Woofer: The Monolith 13 Inch driver was developed from the ground up, with a design focus on achieving output, accuracy, dynamics, and linearity, while minimizing distortion. It is enclosed in a cabinet made from HDF material, with massive internal bracing, and outfitted with three ports that can use foam plugs to run the subwoofer in sealed, semi sealed, or ported mode, as you see fit.

2000 Watt Amplifier: The 2000 watt (RMS) amplifier (3800+ watt peak) 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 8 years. The amplifier has vast reserves

THX Ultra Certified products bring the cinematic experience to large home theaters, up to 3,000 cubic feet in size, with a 10~12 foot viewing distance from the screen*. *Previously known as Select2.

13 Inch Driver: Every part of this driver has been developed from the ground up and customized to deliver high output, low distortion, and accurate bass. Our unique hybrid cone combines long fiber pulp and fiberglass, taking advantage of the pulp's superior stiffness with the additional rigidity and lightweight properties of fiberglass, to deliver a driver of massive durability and excursion. The result is a cone that achieves optimal motion at all frequencies it is asked to produce and beyond.

Specifications

THX Certification
THX Ultra
Recommended Room Size
Up to 3,000 cubic feet
Woofer Size
13 Inch
Cabinet Material
HDF
Porting Options
Sealed, Semi-sealed, Ported (with foam plugs)
Amplifier Power (RMS)
2000 Watt
Amplifier Power (Peak)
3800+ Watt
DSP Data Path
Texas Instruments 48 bit
DSP Filter Coefficients
28-bit
Amplifier Class
Class D
Woofer Cone Material
Hybrid (long fiber pulp and fiberglass)

Pros & Cons

👍 Pros

  • THX Ultra Certified, ensuring highest audio performance and minimal distortion in large rooms up to 3,000 cubic feet.
  • The 13-inch woofer, developed for output, accuracy, and linearity, delivers powerful and precise bass.
  • The HDF cabinet with massive internal bracing enhances structural integrity and minimizes resonance for clearer sound.
  • Versatile porting options with foam plugs allow operation in sealed, semi-sealed, or ported modes for flexible sound tuning.
  • A robust 2000 Watt RMS amplifier provides ample power, with sophisticated DSP for optimal driver performance.

👎 Cons

  • The subwoofer's THX Ultra certification is designed for large rooms, potentially overpowering smaller spaces.
  • The large 13-inch driver and heavy-duty construction imply a substantial physical footprint and weight.
  • Achieving optimal performance might require experimentation with the sealed, semi-sealed, or ported modes.

Frequently Asked Questions

THX Ultra certification signifies that the subwoofer has passed hundreds of scientific tests to ensure the highest audio performance, capable of reaching THX Reference Level in large rooms up to 3,000 cubic feet without audible distortion.
This subwoofer features a 13-inch woofer, which was developed to deliver high output, accuracy, dynamics, and linearity while minimizing distortion.
Yes, the cabinet is outfitted with three ports that can use foam plugs, allowing you to run the subwoofer in sealed, semi-sealed, or ported mode to adjust its sound output to your preference.
The subwoofer is equipped with a 2000 watt (RMS) amplifier, with a peak power of 3800+ watts, ensuring robust and powerful bass reproduction.
The 13-inch driver features a unique hybrid cone that combines long fiber pulp and fiberglass, leveraging the stiffness of pulp and the rigidity and lightweight properties of fiberglass for durability and excursion.