Published On: July 14, 2022

New Monolith THX Certified In-Wall Speakers

Published On: July 14, 2022
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New Monolith THX Certified In-Wall Speakers

Monolith is about high performance, not high prices

New Monolith THX Certified In-Wall Speakers

By Author: Home Theater Review
The staff at is comprised of experts who are dedicated to helping you make better informed buying decisions.

Monolith is the ever-expanding premium AV gear line from Monoprice. It consists of high-performance products that offer exceptional bang for the buck, and these new in-wall speakers are a perfect example. The THX-275IW ($349.99 each) and the THX-465IW ($699.99 each).

The larger THX-465IW offers THX Ultra certification that tests various aspects of performance in order to assure buyers they are getting a speaker that delivers a top-tier home theater listening experience, even in larger spaces.

Monolith is about high performance, not high prices 58156dfe image
Monolith by Monoprice THX-465IW

This speaker sports a six-driver array consisting of four 6.5-inch woofers, one 50-millimeter silk dome midrange, and a 25-millimeter silk dome tweeter. According to company specifications, the frequency response is 37 Hz to 20 kHz ±3 dB, with an 88 decibel rated sensitivity and a recommended power rating between 50 watts and 450 watts. Impedance is rated at 4 ohms.

The more compact and affordable THX‑275IW still has the 50-millimeter silk dome midrange and the 25-millimeter silk dome tweeter, but it only features one 6.5-inch woofer. It is still a formidable speaker and a perfect complement to its more powerful sibling. Depending on the installation could be used on all channels or reserved for use as surrounds while the larger THX-465IW takes on the left, center, and right channel duties.

This speaker has a rated frequency response of 43 Hz to 20 kHz ±3 dB. Sensitivity is almost identical to its sibling, 87.6 decibels. This speaker has a recommended amplifier power rating of 50 to 300 watts with a 4-ohm impedance.

Full Press Release

Brea, Calif., July 12, 2022 - Monolith, the high-end audio brand from Monoprice, today announced the addition of two new in-wall home theater speaker solutions that have been THX® Certified to ensure listeners experience sound that is incredibly dynamic, detailed and immersive.

“Whether it’s for a full-featured home theater room, or an apartment living room, we have Monolith speakers that are sure to provide an optimal home cinema listening experience in rooms of all sizes,” said Hobie Sechrest, Monolith Business Unit Manager, Monoprice. “Engineered to the highest quality standards, these new THX Certified in-wall speakers, as with all Monolith products, deliver uncompromising performance without sacrificing on the value Monoprice products are known for.”

THX Certified Select In-Wall Speakers – Available immediately

When it comes to building the ultimate home theater, speakers are one of the most important investments to ensure sound is reproduced exactly as the audio engineers intended. Monolith’s new THX® Certified Select and THX®Certified Ultra in-wall speakers were meticulously engineered to ensure every seat in the room receives the best possible audio experience. 

Monolith THX‑275IW THX Certified Select In‑Wall Speakers ($349.99 MSRP) feature a premium, high-excursion 6.5-inch woofer, 50mm silk dome midrange driver and 25mm silk dome tweeter that combined deliver precise detail and the absolute best home theater dynamics. The 6.5" high excursion woofer features a long fiber pulp cone, NBR surround, and is designed with a shorting ring to minimize distortion, while the midrange driver operates in the 550Hz to 3.1kHz range to improve overall power handling, lower distortion and improve polar response. 

For larger rooms, Monolith THX-465IW THX Certified Ultra 3-Way In-Wall Speakers ($699.99 MSRP) upsize the THX-275IW by adding three more premium, high-excursion 6.5-inch woofers to the mix (for a total of four). Combined with a 50mm silk dome midrange driver and 25mm silk dome tweeter, these speakers deliver massive full-range sound that’s accurate and perfectly balanced. Since these speakers feature more woofers, the midrange driver of this speaker operates in the 750Hz to 3.4kHz range to ensure a perfectly flat response, minimal distortion, and a higher SPL.

These new Monolith THX Certified in-wall speaker options are further refined by carefully selected fourth order Linkwitz-Riley crossover network acoustic filters. These sophisticated crossovers minimize sonic frequency overlap, reduce distortion, and are an excellent choice to minimize off axis response errors near the crossover frequency. The heavy‑duty dog ear mounting system makes installation a breeze, while the magnetically detachable, powder coated grille can be painted to match any room’s decor.

Monoprice backs these Monolith in-wall speakers with a three-year warranty and 30-day no questions asked money back guarantee.

“When a speaker earns THX Certification, you can be sure that it will deliver an ideal home theater listening experience,” said Steve Martz, global head of THX Certification, THX Ltd. “The Monolith line of premium audio products from Monoprice is robust with THX Certified options. These new Monolith in-wall speakers follow suit and meet the strict THX performance and listening standards, giving customers even more excellent speaker options to consider for their living rooms and home theaters.”

All Monolith™ THX® Certified in‑wall and in‑room speakers utilize the same drivers and crossover components, allowing speakers to be mixed and matched to suit any room. Mixing Monolith in‑wall and in-room speakers for the left, center, right and rear channels will remain timbre matched across the Monolith THX family. For the ultimate listening experience, Monolith THX Certified speakers should be paired with a powerful Monolith THX Certified subwoofer.

About Monoprice, Inc. (DBA

Located in Brea, Calif., Monoprice, Inc. is an e-commerce leader specializing in providing more than 7,500 high-quality yet affordable electronics and tech products. As an industry innovator, Monoprice fills a void in the consumer technology market by delivering exceptional products that are on par with the best-known national brands at prices far below the retail average with incomparable speed and service. Maintaining a business philosophy that focuses on the needs of its customers, the company strives to bring simplicity, fairness and confidence to consumers and businesses shopping for big-ticket electronics and tech accessories. For more information about Monoprice, follow us on FacebookTwitterLinkedInGoogle+YouTube, and the Monoprice Blog.

About THX

Founded in 1983 by filmmaker George Lucas, THX Ltd. today continues to excel at empowering great entertainment experiences. The company provides innovative new technologies and the assurance of superior audio and visual fidelity that truthfully delivers the artist’s vision. THX offerings go beyond studios and cinemas to consumer electronics, content, automotive systems, and live entertainment. Its THX® Spatial Audio and patent-rich THX AAA™ audio technologies, and world-class THX® Certification standards, help THX partners bring premium entertainment enjoyment to market in the cinema, home, and mobile lifestyle electronics. THX Ltd. is an independent subsidiary of Razer. For more information, visit, find us on Facebook, Instagram, YouTube, TikTok, and follow us on Twitter.

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