MartinLogan Motion 40i vs. Monoprice Monolith THX-265B

MartinLogan Motion 40i Tower Speaker Monoprice Monolith THX-265B Bookshelf Speakers
$2600 $800
Dimensions (H × W × D)
42.50” × 7.60” × 12.80”
1080mm × 193mm × 325mm
15.40” × 9.70” × 11.40”
391mm × 246mm × 290mm
Power Type
Passive Passive
Frequency Response
40-25,000 Hz 65-24,000 Hz

Key Takeaways

TLDR Summary: In the sonic showdown between MartinLogan's Motion 40i and Monoprice's Monolith THX-265B, audiophiles face a tough choice. The Motion 40i, with its luscious electrostatic-like clarity from the Folded Motion tweeter, stands tall as a floor-standing beacon of lush soundscapes, catering to those craving detail and room-filling presence. Meanwhile, the compact Monolith THX-265B punches above its weight with THX certification, guaranteeing cinematic thrills in a bookshelf format. Both offer high-fidelity excellence, but your room size, aesthetic preference, and desire for immersive versus precise sound will steer the decision in this high-quality audio duel.

Speaker Comparison

In the world of high-fidelity audio, the chasm between floor-standing tower speakers and bookshelf models is often bridged by the listener's personal preference, room size, and the pursuit of sonic excellence. MartinLogan's Motion 40i and Monoprice's Monolith THX-265B stand on opposite sides of this ravine, each beckoning with a siren's call of acoustic allure. The former, a statuesque pillar of sound, promises not only an auditory experience but also a visual statement, while the latter serves as a testament to the marvels of modern audio engineering compacted into a shelf-friendly format.

Design and Build Quality

Upon first glance, the MartinLogan Motion 40i tower speakers exude a sophistication and elegance that is inherently associated with floor-standing units. Their slender form factor and signature perforated steel grille offer a contemporary aesthetic that is as much a feast for the eyes as it is for the ears. Conversely, the Monoprice Monolith THX-265B bookshelf speakers are all about unassuming practicality. Their robust construction and THX certification hint at a no-compromise approach to sound reproduction, with a design that emphasizes function over flair, aiming to blend seamlessly into any dedicated listening space or home theater setup.

MartinLogan Motion 40i Tower Speaker
MartinLogan Motion 40i arrow (at

Sound Quality

When it comes to sonic performance, the MartinLogan Motion 40i delivers a soundscape that is as expansive as the speaker itself. It boasts a Folded Motion XT tweeter that ensures crisp highs without a hint of harshness, paired with a robust midrange and deeply articulate bass that makes the absence of a separate subwoofer far from conspicuous. In contrast, the Monoprice Monolith THX-265B, while confined to a smaller chassis, is no slouch. Its duo of 6.5-inch woofers and a silk-dome tweeter are engineered to meet rigorous THX standards, offering a level of clarity and balance that is astonishing for a speaker of its size.

Placement and Versatility

The larger footprint of the MartinLogan Motion 40i necessitates consideration of room size and placement to exploit its full potential. These speakers demand space to breathe and deliver their room-filling performance, which might be a challenge in more compact living environments. On the other hand, the Monoprice Monolith THX-265B provides greater flexibility in placement due to its compact size. They can easily be incorporated into a variety of room layouts and are equally adept at serving as the cornerstone of a high-fidelity music system or as part of an immersive surround sound home theater.

In conclusion, the choice between the MartinLogan Motion 40i and the Monoprice Monolith THX-265B bookshelf speakers is not purely one of brand preference, but rather a decision that hinges on the intended use, room dynamics, and personal taste. The Motion 40i offers an imposing and full-bodied auditory experience that can anchor a room's decor as well as its acoustic atmosphere. Meanwhile, the Monolith THX-265B brings forth a disciplined and precise sound signature that belies its modest stature, suitable for those seeking top-notch performance without the imposing presence. Each set of speakers holds its ground in the audiophile landscape, serving different masters with equal fervor.

Check Current Prices:

MartinLogan Motion 40i Tower Speaker
MartinLogan Motion 40i Tower Speaker
Monoprice Monolith THX-265B Bookshelf Speakers
Monoprice Monolith THX-265B Bookshelf Speakers

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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.