Monolith M-OW1 THX Certified On-Wall Speaker | Pair

Monolith M-OW1 THX Certified On-Wall Speaker | Pair

  • High performance audio for your home theatre
  • One powerful 4.5" concentric driver
  • Two 4.5" passive radiators
  • 70Hz ~ 20kHz frequency response
  • THX® certified
  • Product SKU: 141285
Available: In Stock
variant title - Default Title
M-OW1 THX Certified Select On-Wall Speakers

Monolith™ by Monoprice™

M‑OW1 THX® Certified On‑Wall Speakers

Monolith™ M‑OW1 THX® Certified On‑Wall Speakers offer high performance audio from a slim cabinet and compact, powerful drivers. Featuring a powerful 4.5" concentric driver and dual 4.5" passive radiators, Monolith OW1 On‑Wall Speakers have relatively flat frequency response from 70Hz ~ 20kHz and can be used as the front, center, or surround channel speakers. They have 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
  • 4.5" concentric driver
  • Two 4.5" passive drivers
  • 20mm silk dome tweeter
  • 84.4dB sensitivity
  • 4 ohms nominal impedance
  • 5‑way spring‑loaded binding posts
  • Keyhole slot 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™ OW1 uses a single 4.5" concentric driver with an inset 20mm tweeter. The polypropylene cone has a thick NBR surround, while the silk dome tweeter is equipped with a waveguide and neodymium magnet. The driver has been tuned for maximum performance in a slim, small enclosure. The speaker has been outfitted with dual passive radiators to add depth and punch to the bass. For best performance, we recommend the Monolith™ On‑Wall Speakers be paired with a Monolith subwoofer.



The Monolith™ OW1 is equipped with a built‑in keyhole slot, so it can be quickly and easily hung on a wall.

Frequency Response Chart

Impedance Chart

Dimensions Diagram

P/N 41285
Woofer Driver 4.5" polypropylene cone with NBR surround
Tweeter Driver 20mm silk dome coaxial with waveguide and neodymium magnet
Passive Radiators 2x 4.5" polypropylene cone with NBR surround
Frequency Response 70Hz ~ 20kHz ±3dB
Nominal Impedance 4 ohms
Recommended Amplifier Power 30 ~ 100 watts
Sensitivity 84.4dB (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 (each) (WxHxD) 7.0" x 16.1" x 3.5" (178 x 409 x 90 mm)
Weight (each) 15.4 lbs. (7 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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