MartinLogan Motion 30i vs. Monoprice Monolith THX-365C

MartinLogan Motion 30i Center Channel Speaker Monoprice Monolith THX-365C Center Channel Speaker
$900 $500
Dimensions (H × W × D)
6.90” × 16.50” × 10.50”
175mm × 419mm × 267mm
9.70” × 22.90” × 10.80”
246mm × 582mm × 274mm
Power Type
Passive Passive
Frequency Response
65-25,000 Hz 65-24,000 Hz

Key Takeaways

TLDR Summary: In the clash of center channel titans, the MartinLogan Motion 30i offers a lush soundscape with its Folded Motion tweeter, ensuring crisp, articulate highs. It's a natural fit for audiophiles craving detail and soundstage width. On the other side, the Monoprice Monolith THX-365C packs a punch with THX certification and a trio of woofers for a robust, cinematic experience. It's a powerhouse for home theater enthusiasts seeking dynamic, room-filling sound. Both units excel in clarity and immersion, but your choice hinges on whether you prioritize the Motion 30i's audiophile finesse or the Monolith's authoritative theater presence.

Speaker Comparison

When it comes to a home theater setup, the center channel speaker is pivotal for a fully immersive experience. It's the workhorse that delivers more than 60% of a movie's soundtrack, including the critical dialogue that pulls us into the story. Today, we're delving into a comparison between two heavyweights in the center channel arena: the MartinLogan Motion 30i and the Monoprice Monolith THX-365C. Each of these speakers promises to anchor your home cinema with clarity and precision, but they approach sound reproduction in distinct ways that merit a closer look.

The Legacy of MartinLogan

MartinLogan has long been synonymous with electrostatic speaker design, bringing a level of refinement and detail to the table that audiophiles have cherished for years. The Motion 30i, while not an electrostatic speaker, benefits from this legacy, incorporating design philosophies and technologies that are a direct result of MartinLogan's storied history. Its Folded Motion tweeter, a hallmark feature, is designed to reduce distortion and enhance transient response, providing a detailed and nuanced audio experience.

MartinLogan Motion 30i Center Channel Speaker
MartinLogan Motion 30i arrow (at

Monoprice's THX Certification

The Monoprice Monolith THX-365C comes with an impressive pedigree of its own, boasting THX certification. This assures that the speaker meets rigorous standards for volume, quality, and clarity set by THX Ltd., the company founded by George Lucas. The THX certification means this center channel is engineered to deliver the precise sound quality and performance that recreates the cinematic experience as intended by the filmmakers.

Moving beyond the logos and certifications, the two speakers present themselves very differently in terms of design and build quality. The Motion 30i sports a sleek, minimalist look with its elegant cabinet and the signature perforated steel grille that protects the Folded Motion tweeter and aluminum cone woofers. It's a speaker designed to blend into a modern living space seamlessly.

Conversely, the Monolith THX-365C takes on a more utilitarian appearance, which might be less appealing from an interior design perspective but is wholly functional. Its black ash vinyl finish is understated, and its non-resonant cabinet is designed to focus purely on acoustic excellence. From the removable grille to the robust construction, this speaker means business.

Sound Performance

When it comes to sound performance, the MartinLogan Motion 30i shines with its articulate highs and mids. The Folded Motion tweeter reveals subtleties in vocals and high-frequency details that can be lost on lesser center channel speakers. Its soundstage is wide and engaging, making it an excellent choice for discerning listeners who value clarity and openness in dialogue and score.

The Monoprice Monolith THX-365C answers back with a no-compromise approach to sound that is characteristic of THX-certified speakers. Its controlled directivity ensures that sound is directed squarely at the listener, minimizing room interactions and creating a focused audio experience. The dual 6.5" woofers deliver a robust and authoritative bass response, ensuring that the speaker can hold its own even in action-packed sequences.

Another aspect to consider is the integration with your existing system. The MartinLogan Motion 30i is known for its versatility and ease of pairing with a wide range of amplifiers and receivers. This flexibility makes it an attractive option for users who have mixed-brand systems. On the other hand, the Monolith THX-365C, with its power-hungry design, may require a more robust amplifier to unlock its full potential, which could be a consideration for those who are not looking to upgrade other components.

In conclusion, choosing between the MartinLogan Motion 30i and the Monoprice Monolith THX-365C center channel speakers comes down to personal preferences and system synergies. The Motion 30i offers an audio experience steeped in MartinLogan's refined acoustic heritage, perfect for the audiophile who values a high-resolution, crystal-clear midrange and treble. Meanwhile, the Monoprice Monolith THX-365C delivers a powerful, room-filling sound with the assurance of THX certification, suited for those who crave a cinema-like experience at home. Whichever path you choose, both speakers stand ready to anchor your home theater's dialogue and detail with command and finesse.

Check Current Prices:

MartinLogan Motion 30i Center Channel Speaker
MartinLogan Motion 30i Center Channel Speaker
Monoprice Monolith THX-365C Center Channel Speaker
Monoprice Monolith THX-365C Center Channel Speaker

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Disclaimer: the speaker data listed on this website are correct to the best of our knowledge, but we do not guarantee the accuracy of the data. Please double-check any measurements with the manufacturer before making a final purchasing decision.