Monolith M518ht Thx Certified 5.1 Home Theater System

SKU: MNP-41287
Unit Price
US$ 1,148.27
US$ 1,148.27
US$ 1,141.381%
US$ 1,137.351%
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Ceramic Y30
Dimensions (wxhxd) (each)
6.0" x 6.3" x 5.9" (153 x 160 x 150 mm)
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
High‑pass filter
1.7kHz @18dB/oct
Low‑pass filter
1.7kHz @ 12dB/oct
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
Vented MDF cabinet with horizontal and vertical bracing
Nominal Impedance
4 ohms
FEA optimized, focused field
FEA optimized NBR (nitrile budadiene rubber)
Black PVC
20mm silk dome coaxial with waveguide and neodymium magnet
8" long fiber pulp/glass fiber cone
Crossover Type
Dimensions (HxWxD)
Crossover Frequency
Variable 40 ~ 160 Hz
81.0dB (2.83V@1m)
Frequency Response
80Hz ~ 20kHz ±3dB
Output Connectors
RCA stereo pair (direct passthrough)
Input Connectors
RCA stereo pair
Weight (each)
4.2 lbs. (1.9 kg)

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

The Monolith™ M518HT THX® Certified 5.1 Home Theater System is a compact system designed to deliver full‑range, dynamic audio for a truly immersive experience from your home theater or gaming systems. The system features five satellite speakers with high excursion concentric drivers that deliver accurate performance down to 80Hz. The included THX® Certified 8" Powered Subwoofer easily blends with the satellite speakers to present a seamless frequency response from 30Hz ~ 20kHz, with deep and powerful bass. The Monolith M518HT THX® Certified 5.1 Home Theater System is quick and easy to setup ‑ simply connect it to any multichannel receiver or amplifier for a fantastic cinema or gaming experience.

  • THX® Certified
  • 5.1 Channels
  • Five Satellite Speakers
  • 8" Powered Subwoofer
  • Compact Form Factor
  • Wall Mounting Keyhole
  • MDF Enclosures
  • Easy to Connect


The M518HT Monolith™ THX® Certified Compact Satellite Speakers feature 4.5" concentric drivers, each with inset 20mm silk dome tweeter. The polypropylene cone has a thick NBR surround and the silk dome tweeter is equipped with a waveguide and neodymium magnets. The driver has been tuned for maximum performance and has a flat frequency response down to 80Hz.


Each M518HT satellite speaker has a keyhole mount, so it can be easily hung on a wall with a single screw.


The M518HT system includes a compact, but mighty 8" 150‑watt downfiring ported subwoofer. Tuned in conjunction with the satellite speakers, the sub/sat combination reproduces a flat and seamless frequency response from 30Hz ~ 20kHz. The subwoofer 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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