Monolith THX-LCR Review: Ranked #11 of 28

Last updated: October 9, 2026

The Monolith THX-LCR ranks #11 out of 28 total In-Wall & In-Ceiling Speakers for sound quality. See all Passive Home rankings for every top pick.

Brand: Monolith

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Monolith THX-LCR - ranked #11 of 28 In-Wall & In-Ceiling Speakers · Editor's rating 3.9/5

#11 Monolith THX-LCR Discontinued Estimated eBay

Same family: the Monolith THX-365T (floorstanding, rated 3.9/5), the Monolith THX-365C (center, rated 4.1/5) and the Monolith THX-365IW (smaller in-wall, ranked higher, rated 4/5).

Pros: A three-way THX Ultra in-wall LCR with two 6.5” woofers, a 2” silk dome midrange and a 1” silk tweeter, rated at 88.5dB. A review found strong dynamics, wide off-axis response and a neutral tone.

Cons: No independent measurements yet, so its tonal balance and directivity can’t be compared with ranked speakers. The review measured bass to about 65Hz in a wall, and its 14.4” width is awkward for 16” stud bays. It is discontinued.

Drivers2x 6.5” pulp fiber woofer, 1x 2” silk dome midrange, 1x 1” silk dome tweeter
EnclosureIn-wall; cutout template 13-3/4” W x 15-5/8” H
Frequency Response35Hz - 24kHz (manufacturer specified)
Impedance4 ohms nominal (manufacturer specified)
Sensitivity88.5dB (manufacturer specified)
Weight14.1 lbs (6.4 kg)

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