Connect with us

Hi, what are you looking for?

In-Wall Speakers

Monoprice Introduces Monolith THX In-Wall Speakers

Monoprice expands its in-wall speaker line with two Monolith THX Certified loudspeakers that are easy to install and complement monoprice’s previously released in-wall subwoofers.

Monoprice Monolith In-Wal THX Speakers

Monoprice has been very active in the speaker and subwoofer categories over the past year with a number of new product introductions under their Mononlith brand (see links at the end of this article). Their latest entries are the THX Certified THX-275IW and THX-465IW in-wall speakers. 

Tip: These speakers should be a great complement to Monoprice’s recently announced M-IWSUB8 and M-IWSUB82 In-Wall Subwoofers.

Features Shared by Both Speakers

THX Certification Process
  • THX Certification: This speaker line has been submitted and passed THX standards for application and performance. The THX-275IW is THX Select Certified (Suitable for rooms up to 2,000 cubic feet in size) while the THX-465IW  is THX Ultra Certified (Suitable for rooms up to 3,000 cubic feet in size).
  • Impedance: Both speakers have a 4-ohm impedance. Make sure your amplifier or receiver can double its power output into 4 ohms.
  • Connections: Each speaker has a set of spring‑loaded binding posts.
  • Easy Install: The heavy‑duty dog-ear mounting system makes for a fast and problem-free installation. The magnetically detachable grille is powder coated in white and can be painted to match any decor

Tip: Monolith™ THX® Certified in‑wall and in‑room speakers use the same driver and crossover components. This means you can mix and match Monolith THX-certified speakers to suit any room. Using Monolith THX in‑wall and in-room speakers for the left, center, right, and, rear channels in a home theater will still be timbre matched.

Monolith THX-275IW

Monoprice Monolith In-Wal THX-275IW Speakers
  • Product Number: 42830
  • Tweeter: 1x 25mm silk dome with neodymium magnet
  • Mid-range: 1x 50mm silk dome
  • Woofer:  1 x 6.5″ long fiber pulp cones with NBR surrounds
  • Grill Color: White
  • Frequency Response: 43Hz to 20kHz ±3dB
  • Sensitivity: 87.6dB (2.83V/1m)
  • Low-Frequency Crossover: 550Hz @6dB/oct
  • Midrange Crossover: 550Hz to 3.1kHz @12dB/oct
  • High-Frequency Crossover: 3.1kHz @12dB/oct
  • Amplifier Power Range: 50 to 300 watts
  • Dimensions (HxWxD): 16.5″ x 11.1″ x 3.7″ (419 x 281 x 94 mm)
  • Weight: 11 lbs. (5.0 kg)

Monolith THX-465IW 

Monoprice Monolith In-Wal THX-465IW Speakers
  • Product Number: 42829
  • Tweeter: 1x 25mm silk dome with neodymium magnet
  • Mid-range: 1x 50mm silk dome
  • Woofer:  4x 6.5″ long fiber pulp cones with NBR surrounds
  • Grill Color: White
  • Frequency Response: 37Hz to 20kHz ±3dB
  • Sensitivity: 88.0dB (2.83V/1m)
  • Low-Frequency Crossover: 750Hz @6dB/oct
  • Midrange Crossover: 750Hz to 3.4kHz @12dB/oct
  • High-Frequency Crossover: 3.4kHz @18dB/oct
  • Amplifier Power Range: 50 to 450 watts
  • Dimensions:  Dimensions (HxWxD) 36.3″ x 11.1″ x 3.7″ (921 x 281 x 94 mm)
  • Weight: 26.9 lbs. (12.2 kg)

Price & Availability

Tip: If you don’t have experience installing in-wall speakers, you should consult a home theater installer. 

Tip: If you need an amplifier(s) to go with your speakers, check out:

Advertisement. Scroll to continue reading.

Click to comment

Leave a Reply

Your email address will not be published. Required fields are marked *


You May Also Like

A/V Furniture & Accessories

Get better sound and video with two accessories from Monoprice priced well below the competition.

In-Wall Speakers

KEF implements latest Uni-Q drivers in new flagship architectural speaker line. There are two new models that are THX Domimus and THX Ultra Certified...

New Products

The SVS In-Wall 3000 Subwoofer will shake up your room with 800-watts RMS of bass pumped into dual 9-inch drivers hidden in your wall.

New Products

Monoprice is offering several new Blackbird 8K HDMI switchers and splitters for both home and professional use.

In-Wall Speakers

The new Monitor Audio Creator Series Loudspeakers had the CI crowd at ISE 2023 buzzing.


The menu for 2023 includes a spike in vinyl prices, Hisense ascending, and a love for all things simple.

A/V Furniture & Accessories

The Monoprice Blackbird 8K HDMI Splitter/Switch can deliver up to 40Gbps video bandwidth, support resolutions up to 8K@60Hz, and multichannel uncompressed audio.


For less than the cost of dinner and a movie out with the family, you can bring home this eight channel home theater speaker...


ecoustics is a hi-fi and music magazine offering product reviews, podcasts, news and advice for aspiring audiophiles, home theater enthusiasts and headphone hipsters. Read more

Copyright © 1999-2023 ecoustics | Disclaimer: We may earn a commission when you buy through links on our site.

SVS Bluesound PSB Speakers NAD RSL Speakers Crutchfield ProjectorScreen Focal Naim Audio Cambridge Audio