Compare Marshall Monitor III A.N.C. Over-Ear Bluetooth Headphones vs Marshall Kilburn III Portable Bluetooth Speaker

The lack of a built-in 3.5mm analog jack was a repeated drawback, even though USB-C-to-3.5mm wired listening is possible.

ANC was usually judged good, solid, or decent for daily use, but several reviewers said it still trails Bose, Sony, or the top tier.

Advanced software features were considered solid and modern, but reviewers did not see them as uniquely class-leading.

Aesthetics were distinctive and often praised, but some reviewers noted the retro Marshall look will not suit everyone.

ANC background noise performance was decent: one review measured strong overall noise reduction, and another said white noise was not bad.

ANC-off listening measured slightly better in one review, suggesting ANC can subtly affect the sound signature.

ANC slightly affects audio performance, with one review noting higher sound-quality scores when ANC is disabled.

Android compatibility was positive in one review that found the headphones sounded good on Android.

The app was viewed positively for customization, controls, battery options, and a generally intuitive experience.

App impressions are mostly positive when the Marshall app works, with useful EQ and firmware support, but one review had trouble finalizing the Kilburn III connection.

aptX support was criticized as absent, especially for Android or lossless-codec users.

Audio-video sync was a concern for gaming because one reviewer tied the lack of low-latency codecs to more noticeable latency.

Audio format support is a limitation because reviewers point to missing USB Audio and missing hi-res Bluetooth codec support.

Auracast support was treated as a positive future-facing feature, especially for Android and LE Audio readiness.

Auto-play and wear detection worked but was slow to react in one test.

Bass was usually described as punchy or well-balanced, though several reviewers said it could use more impact, cleaner control, or stronger low-end weight.

Battery life had the strongest agreement: reviewers repeatedly described it as class-leading, incredible, extraordinary, or far ahead of competitors.

Reviewers strongly agree battery life is a standout, repeatedly praising the 50-hour claim and multi-day real-world stamina, with one test reporting about 25 hours at moderate volume.

Bluetooth performance was praised in one review as stable and high-performance.

Codec support is consistently treated as a limitation because reviewers note the lack of higher-resolution Bluetooth options such as LDAC or aptX Adaptive.

Bluetooth setup and stability are praised in the reviews that evaluate it, including easy pairing, a solid connection, and a simple pairing process.

The only opinionated range test is positive, with one reviewer saying the speaker exceeded the stated 10-meter range around the house.

Bluetooth version support was tied to a stable, high-performance wireless connection in one review.

Build quality was generally strong and rugged, with praise for durability and materials, offset by one report of creaking.

Hi-res playback support was a weakness because reviewers repeatedly noted no hi-res Bluetooth audio support.

Button controls were a standout strength, with reviewers preferring the tactile joystick and physical buttons over touch controls.

Build quality is widely praised as solid, durable, and premium, with reviewers highlighting the substantial cabinet feel and sturdy hardware.

Cable quality received praise in one review for the black cable with brass tips and premium-feeling presentation.

The carry case was usually praised as sturdy, compact, premium, or travel-friendly, though a few reviewers found it bulky or unnecessary.

Charging was praised for fast top-ups, with reviewers citing up to 12 hours of playback from a short charge.

Charging is mixed: quick-charge support is appreciated, but reviewers also note three-hour full charges, much slower charging with weak adapters, and slower charging while playing music.

Clamping comfort was rated very highly, with reviewers reporting little to virtually zero pressure.

Codec support was a clear weakness because reviewers noted no hi-res, lossless, or low-latency codec support.

Across reviews, the Kilburn III is repeatedly described as energetic, room-filling, cohesive, and able to handle a wide variety of music well.

Comfort was one of the strongest consensus wins, with reviewers repeatedly praising all-day wear, soft fit, and low fatigue.

Connectivity options were mixed: wired and wireless playback were useful, but the lack of a built-in 3.5mm jack and coiled cable hurt convenience.

Physical controls are a major strength, with reviewers praising the knobs, switches, tactile buttons, and upgraded control layout.

Design and aesthetics were mostly praised for the distinctive Marshall look, premium detailing, and rugged styling, though taste varied.

Design is one of the strongest consensus points, with reviewers repeatedly praising the retro Marshall aesthetic, premium detailing, and statement-piece presence.

Detail retrieval is mostly praised for clarity and instrumental texture, though one review notes a small loss of upper-mid detail.

High-volume distortion control earns strong praise, with reviewers repeatedly saying the speaker stays clean or distortion-free when pushed loud.

Drop resistance receives limited support from one reviewer who did not test drops but judged the build likely to survive minor falls.

Durability over time was viewed positively because reviewers described more durable, repairable construction and long-term toughness.

Dust resistance is generally seen as improved and useful for sand, dirt, and outdoor use, though the IP54 rating is not framed as fully rugged.

Dynamic headroom is praised through reports of large-room output, energetic sound, and plenty of extra volume without losing control.

Ear cup padding was widely praised as extremely soft, plush, pillow-like, and important to comfort and sealing.

Ear cup rotation and swivel helped portability, though one reviewer found the twisting mechanism odd on the head.

Earpad/body-borne noise was a notable negative for one reviewer, who heard footsteps and heartbeat-like sounds.

Energy efficiency is supported by one review's observation that the major runtime gain comes from surprisingly small battery-capacity growth.

EQ customization is a clear strength, combining responsive bass/treble knobs with app presets, five-band EQ, placement compensation, and M-button customization.

EQ customization was broadly useful and responsive, though one reviewer wanted more precision than the five-band setup provides.

Everyday usability is praised because the analog controls are intuitive, easy to live with, and accessible to users without a learning curve.

Features at launch were adequate but not standout, with one reviewer saying the standard feature set lacked a truly distinctive tool.

The default frequency response was judged broadly listener-friendly, especially for casual listeners.

Frequency balance is mostly praised for tight bass, clear mids, and lively highs, though a few reviews find it somewhat bassy or middy in places.

Google Fast Pair receives limited but positive mention as a useful setup convenience.

The handle and strap are repeatedly praised as comfortable, secure, stylish, and helpful for moving a relatively heavy speaker.

Headband adjustability earned a small positive note for visible adjustment numbering.

Headband comfort was praised for reducing top-of-head pressure through light weight and support-strap design.

Hinge durability was praised for being able to twist without showing signs of breaking.

Home theater integration is speculative but positive in one review, which notes potential use as Bluetooth surround speakers with compatible Marshall soundbars.

Immersive audio quality was mixed, with some reviewers enjoying the added atmosphere and others finding the effect limited or not truly immersive.

Included accessories received praise for the attractive red-velvet case and included cables.

Instrument separation was a consistent strength when mentioned, with reviewers noting solid layering, instrument placement, and separation across bass, mids, and highs.

Integrated microphone feedback was mixed, with clear/crisp quiet-room results but criticism of vocal clarity or noisy-environment performance.

Inter-speaker connectivity is a repeated weakness because reviewers criticize the lack of built-in multi-speaker systems, stereo pairing, or reliable Auracast-style pairing.

LDAC was only discussed as an absent higher-quality codec, making it a codec-support weakness.

LE Audio readiness was treated as a positive future-proofing feature by multiple reviewers.

Maximum loudness is a major strength, with reviewers describing it as loud, room-filling, party-ready, and in some cases too loud for an apartment.

Low-volume performance is praised in the limited evidence available, especially for keeping richness, separation, and bass at modest listening levels.

Maximum-volume clarity was strong in the reviews that addressed it, with no audible or max-volume distortion reported.

Microphone support is a weakness because reviewers explicitly point out the lack of a built-in mic or speakerphone capability.

Microphone noise reduction was praised for handling simulated or real wind well, despite some vocal-clarity caveats elsewhere.

Call microphone quality received strong praise from one reviewer, especially for windy phone calls.

Midrange impressions were mixed: some praised vocals and instruments, while others heard under-emphasized mids, prominent high mids, or occasional clutter.

Multi-platform compatibility was positive where tested on both iOS and Android.

Multi-speaker pairing reliability is a weakness, with several reviewers criticizing missing stereo pairing, missing multi-speaker pairing, or glitchy connection behavior.

Multipoint reliability was strong where tested, with seamless switching or extremely reliable two-device use.

Passive isolation was praised for the soft cushions and seal, which helped block noise even before ANC was considered.

Omnidirectional sound is widely praised, with reviewers describing clear sound at every angle, no dead spots, and useful 360-degree coverage.

On-device controls are one of the most praised usability features, especially the tactile knobs, playback toggle, power switch, and direct adjustments without relying on the app.

Overall recommendations were positive but caveated: reviewers liked the package, especially for travel and rock-focused listening, while noting ANC, codecs, and wired tradeoffs.

Portability and foldability were major strengths thanks to the compact folding design and small travel footprint.

The power-bank function is treated as a useful bonus, though one reviewer warns that charge direction can be confusing when the speaker is off.

Premium feel was praised through richer materials, superior build impressions, and a luxurious presentation.

The preset EQ experience was praised in one review, especially the bass boost setting for adding dynamic sound without excess bass.

Price/value is mixed-positive: reviewers call it expensive or pricier than predecessors, but many say the sound, features, and upgrades justify the cost.

Replaceable earpads were praised as easy to remove or replace and useful for longevity.

Replaceable pads and headband parts were a repairability plus where described.

Sensor performance was a concern because one reviewer reported random wear-sensor triggers.

Setup simplicity gets limited but strong praise, mainly through Google Fast Pair and straightforward Bluetooth pairing.

Smart assistant integration is weak because multiple reviews explicitly note the absence of voice assistants or voice control.

Smart features are limited overall; reviewers note the lack of Wi-Fi, voice control, and broader smart-speaker functions, though the simple music-first approach appeals to some.

Smart listening features were mixed: adaptive volume, Spotify Tap, and battery preservation drew praise, while missing convenience features held the score down.

Smart Pause performance was criticized for random triggering in one longer test.

Setup simplicity received praise from one reviewer who called pairing/setup easy.

Sound leakage was viewed positively in one review because the plush ear cups helped minimize leak.

Reviewers generally liked the sound, describing it as pleasing, energetic, balanced, or excellent, with the strongest praise for rock and instrument-driven listening.

Soundstage width drew mixed reactions, from solid or opened-up presentation to narrow, cluttered, or not true-spatial enough.

Spatial audio was divisive: some liked the extra space, but others found it unnatural, underwhelming, or below true Atmos-style experiences.

Speakerphone quality cannot be praised because reviewers note the speaker lacks the built-in mic needed for hands-free calling.

Connection stability was praised as stable and high-performance in one review.

Status indicators are praised where discussed, especially the battery gauge and illuminated knob markers.

Stereo imaging is mixed: reviewers like the wide and immersive presentation, but some note limited true stereo separation or asymmetry.

Streaming service integration was praised strongly for Spotify Tap, especially for starting playback without pulling out a phone.

Bass/subwoofer performance is strongly praised for resonance, rumble, and control, though some listeners may want to dial it down.

Surround-style presentation is limited; the speaker creates an immersive wide field, but reviewers caution it is not true surround sound.

Sustainability has limited mixed support through the replaceable battery compartment, with uncertainty about replacement-battery availability.

Sustainability and repairability were praised for replaceable parts and repair-minded design, with a caveat that batteries are not user-replaceable.

Sustainability materials received a modest positive note for recycled plastic use.

Transparency mode was considered usable and sometimes natural, but reviewers also noted hiss, limited realism, or weaker performance than the best rivals.

Travel friendliness was a major strength due to battery life, compact folding, wired flexibility, and protective case design.

Treble feedback was split between clear, impressive highs and complaints about sibilance, fatigue, or sharpness on some tracks.

USB-C was useful for charging and wired listening, but reviewers criticized the one-port limitation and need for power in wired use.

USB-C support is praised for modern charging, fast-charging compatibility, and external-device charging, with some caveats around charger requirements.

Value was generally fair to good, especially on sale, but reviewers noted strong cheaper or better-performing rivals.

Value for money is mostly positive because reviewers often say the price is justified by sound, battery life, design, and upgrades, though one finds better value elsewhere.

Vocal clarity is praised in music playback, with reviewers calling vocals clear, crisp, forward, textured, and easy to hear in dense mixes.

Voice prompts and feedback added personality through Marshall-style guitar sounds during power and pairing.

One reviewer found the headphones plenty loud, with comfortable listening volume well below maximum.

Water and sweat resistance was a weakness because reviewers noted the headphones are not waterproof and should avoid rain or gym use.

Water resistance is mixed: IP54 is a meaningful improvement for splashes and rain, but reviewers repeatedly caution that it is not beach-rugged or IP67-level protection.

Wear detection auto-pause was only moderately successful, working but reacting slowly.

Wear detection performance was a weakness in one longer test because the sensor randomly triggered.

Weight comfort was a major strength, with reviewers repeatedly calling the headphones light for the class and easy to wear.

Weight convenience is mixed: reviewers appreciate the strap and manageable carry feel, but repeatedly say it is hefty, backpack-unfriendly, or better for home/garden use.

Wi-Fi streaming is a weakness because reviewers note there is no Wi-Fi connection and say its absence is a shame at this price.

Wind handling was mixed: one reviewer found wind susceptibility in ANC/transparency, while another found moderate wind manageable.

Wired input receives limited positive support, with one reviewer calling the aux input a good alternative to missing high-quality wireless audio options.