Monolith Thx Certified 8In 150-Watt Powered Subwoofer

SKU: MNP-41289
Unit Price
US$ 502.36
US$ 502.36
US$ 499.351%
US$ 497.581%
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Vented MDF cabinet with horizontal and vertical bracing
Ref level (100mv @ 50hz)
88dB @ 1m
Thx® frequency response (vented)
35 ~ 200 Hz
Eq2 frequency response (vented)
30 ~ 200 Hz
Eq1 frequency response (vented)
24 ~ 200 Hz
Auto turn off time
30 minutes
Variable phase
0 ~ 180°
Signal Turn On
Selectable always on/auto on
Variable Level Control
+15/‑20 dB
Voice Coil
30mm high‑temperature aluminum wire and aluminum bobbin
Claridy DSP 150‑watt (RMS) with DSP control
Input Connectors
RCA stereo pair
Ceramic Y30
FEA optimized, focused field
FEA optimized NBR (nitrile budadiene rubber)
Black PVC
8" long fiber pulp/glass fiber cone
Crossover Type
Dimensions (HxWxD)
Crossover Frequency
Variable 40 ~ 160 Hz
Output Connectors
RCA stereo pair (direct passthrough)

Monolith™ by Monoprice™
A truly immersive experience from your home theater or gaming systems

The Monolith THX® Certified 8" 150‑watt Powered Subwoofer features an 8" downfiring cone in a vented MDF enclosure that is tuned to easily blend with the Monolith THX® Certified Compact Satellite Speakers to present a seamless frequency response from 30Hz ~ 20kHz, with deep and powerful bass. It is THX® Certified, ensuring an accurate and powerful listening experience as accurate to the source as possible. The Monolith THX® Certified Subwoofer is quick and easy to setup ‑ simply connect it to any multichannel receiver or amplifier and pair it with capable satellite speakers for a fantastic cinema or gaming experience.

  • THX® Certified
  • 8" Powered Subwoofer
  • 150‑watt (RMS) Claridy DSP amplifier
  • Compact Form Factor
  • MDF Enclosure
  • Easy to Connect


The Monolith™ THX® Certified 8" 150‑watt Powered Subwoofer is a compact, but mighty downfiring, ported subwoofer. Tuned in conjunction with the THX® Certified Satellite Speakers, the sub/sat combination reproduces a flat and seamless frequency response from 30Hz ~ 20kHz. It features three EQ controls, allowing you to dial in the best bass response for your room, with the THX® EQ having the lowest distortion and cleanest sound.

For almost 40 years, THX has set the standard for the audio and visual fidelity of entertainment experiences. THX® Certification is a globally recognized assurance of uncompromising quality, consistency and performance. We blend art, technology, and the dynamics of real world listening and viewing environments to ensure products deliver the artist's true vision.

THX® Certification
Using industry standards and a proprietary testing methodology, THX engineers evaluate and certify the audio and visual fidelity of consumer electronics to ensure they deliver the optimal entertainment experience. In cinemas, at home, and on‑the‑go, your entertainment comes alive with THX.

Certification Process

What We Test
THX engineers perform hundreds of audio and video performance and quality assurance tests before a product is confirmed to be THX® Certified.

AUDIO: We analyze everything from output levels, frequency response, signal‑to‑noise, distortion and bass management to recreate high impact cinema sound and best‑in‑class audio fidelity.

VIDEO: We test color accuracy, panel performance, and video processing, to confirm a display delivers accurate images and pristine video performance in every frame.

Why Certification Matters
The THX® Certified benchmark offers consumers the assurance of superior audio or visual performance from consumer electronics.

  • THX offers the industry's most rigorous testing process
  • THX guarantees high performance and premium build quality

5 Year Replacement Warranty

Monoprice™ not only stands behind this product with a 5 year replacement warranty, we offer a 30 day money back guarantee as well! If the product you purchase does not satisfy your needs, send it back for a full refund.

30 Day Money Back Guarantee

Monoprice stands behind every product we sell with a 30 day money back guarantee! If the product you purchase does not satisfy your needs, send it back for a full refund.

Quality at a Fair Price

Monoprice's rugged design and rigid quality control standards deliver high quality products at fair prices.

Hassle Free Packaging

Monoprice exists to bring simplicity, fairness, and confidence to technology choices. This product features recyclable packaging that is simple to open, cost effective, with minimal waste, and fully protective as it travels to you.

Service and Support

You're never on your own with Monoprice products! We have a full team of friendly and knowledgeable technicians available to answer your questions, both before and after the sale. Contact our technical support team for questions about our products, troubleshooting, or even suggestions for products to fit your particular needs. Not to be outdone, our friendly and helpful customer service team is here to make your ordering, delivery, and any possible returns a quick and painless operation, from start to finish!

Monoprice™, Monolith™, the Monolith logo, and all Monoprice logos are trademarks of Monoprice Inc.

THX® and the THX logo are the property of THX Ltd., registered in the U.S. and other countries.

Warning: This product may contain a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to
Shipping specs
19.80 lbs
Shipping from
This product is shipped from our supplier's warehouse in Rancho Cucamonga, CA, United States
Our guarantee
This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
A 25% handling charge is levied against all authorized returns except those due to our error. Unauthorized returns are subject to a 40% handling charge. Damages & defects must be reported to us within 14 days.
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