Monolith M-OW3 THX Certified LCR/Soundbar On Wall Speaker | Each

Monolith M-OW3 THX Certified LCR/Soundbar On Wall Speaker | Each

  • High performance audio for your home theatre
  • Three powerful 4.5" concentric drivers
  • Six 4.5" passive radiators
  • 70Hz ~ 20kHz frequency response
  • THX® certified
  • Product SKU: 141286
Available: In Stock
variant title - Default Title
M-OW3 THX Certified Select On-Wall Speaker

Monolith™ by Monoprice™

M‑OW3 THX® Certified On‑Wall Speaker

The Monolith™ M‑OW3 THX® Certified On‑Wall Speaker offers high performance audio from a slim cabinet and compact, powerful drivers. Featuring three powerful 4.5" concentric drivers and six 4.5" passive radiators, the Monolith OW3 On‑Wall Speaker has a relatively flat frequency response from 70Hz ~ 20kHz and can be used as the front, center, or left and right channels in an on‑wall soundbar configuration. It has been THX® Certified to ensure spectacular home theater performance in just about any room. Add a THX® Certified Monolith subwoofer and you have the ultimate in audio performance!

  • 70Hz ~ 20kHz frequency response
  • Slim MDF cabinet
  • Three 4.5" concentric drivers
  • Two 4.5" passive drivers
  • Three 20mm silk dome tweeters
  • 84.8dB sensitivity
  • 4 ohms nominal impedance
  • 5‑way spring‑loaded binding posts
  • Keyhole slots on rear for easy wall mounting

THX Certified

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

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



The Monolith™ OW3 uses three 4.5" concentric drivers, each with an inset 20mm tweeter. The polypropylene cones have thick NBR surrounds, while the silk dome tweeters are equipped with waveguides and neodymium magnets. The drivers have been tuned for maximum performance in a slim, small enclosure. The speaker has been outfitted with six passive radiators to add depth and punch to the bass. For best performance, we recommend the Monolith™ On‑Wall Speaker be paired with a Monolith subwoofer.



The Monolith™ OW3 is equipped with two built‑in keyhole slots, so it can be quickly and easily hung on a wall.

Frequency Response Chart

Impedance Chart

Dimensions Diagram

P/N 41286
Woofer Drivers 3x 4.5" polypropylene cones with NBR surrounds
Tweeter Drivers 3x 20mm silk dome coaxials with waveguides and neodymium magnets
Passive Radiators 6x 4.5" polypropylene cones with NBR surrounds
Frequency Response 70Hz ~ 20kHz ±3dB
Nominal Impedance 4 ohms
Recommended Amplifier Power 50 ~ 150 watts
Sensitivity 84.8dB (2.83V @ 1m)
Crossover Type Acoustic filter
Low‑Pass Filter 2.4kHz @ 12dB/oct
High‑Pass Filter 2.4kHz @ 18dB/oct
Cabinet Material Medium density fiberboard (MDF)
Finish Black matte
Input Connectors 5‑way spring‑loaded binding posts
Dimensions (WxHxD) 47.2" x 7.0" x 3.5" (1200 x 178 x 90 mm)
Weight 23.1 lbs. (10.5 kg)


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.

Triangular Yellow Warning Symbol
Warning: This product can expose you to Phthalates, which is known to the State of California to cause cancer and reproductive harm. For more information, go to

How long will it take for my order to arrive?

After the order has been placed, shipping takes about 5-7 business days. Our warehouse is located in the Netherlands.

How much do I have to pay for shipping?

Shipping costs to Finland, Greece, Ireland, Portugal, Spain, Sweden, Austria, Belgium, Bulgaria, Croatia, Czechia, Denmark, Estonia, Hungary, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Monaco, Netherlands, Poland, Romania, Slovakia, Slovenia, Andorra, San Marino, Vatican City, France:

  • Orders above 30€: Free Shipping
  • Orders below 30€: 3,79€

For deliveries to Cyprus, Malta, Norway, Switzerland, shipping costs vary by weight:

  • 10kg – 4.99 kg: 7,68 €
  • 5kg – 9.99 kg: 8,79€
  • 10kg – 19.99 kg: 11,33€
  • 20kg – 29.99 kg: 11,67€
  • 30kg – 39.99 kg: 19,91€

What are the returns policy?

You can return your items to us for free within 30 days without giving a reason. 

How does the return work?

If you do not like an article, you can return it to us within 30 days of delivery. Please contact us at to receive a free return label. Please print the return label, stick it on the carefully sealed package and hand it over to your local post office. Please keep the document with the tracking number carefully.

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