Compare Marshall Monitor III A.N.C. Over-Ear Bluetooth Headphones vs Sonos Ace Wireless Over-Ear Headphones

ANC is consistently described as solid to above average and improved versus the prior model, but most sources still place it behind top-tier Bose or Sony performance. You can adjust ANC strength in the app and set how the ANC button cycles modes; the common complaint is the lack of true adaptive ANC that auto-adjusts for you.

ANC is widely rated strong for travel and commuting, and multiple reviewers say firmware updates pushed it closer to class leaders. A minority still place Bose and Sony slightly ahead, but few call the Ace weak at cancelling steady noise. Most reviews describe limited user control over ANC intensity: typically on, off, or Aware mode, with some adaptive behavior added over time. If you want multiple manual levels like Bose offers, this is a common disappointment.

Android support is good for basics (pairing features, LE Audio readiness), but Android users who want aptX or LDAC will find those codecs missing.

Android compatibility is generally solid, and Android users get the biggest upside from aptX Lossless and broader codec support. Some Sonos home-theater features started iOS-first, but later updates expanded support according to reviewers.

The Marshall app is generally well-liked for being clean and functional, giving access to firmware, EQ, ANC levels, control customization, and battery-care features.

The Sonos app is needed for setup, updates, EQ, and home-theater features, and opinions are mixed. Some like the simplicity and redesign, while others report pairing hiccups, limited options, or updates that feel slower than they should.

Reviews that address aptX note it is not supported, which can be a downside for some Android users.

aptX support, including aptX Lossless on compatible Snapdragon Sound devices, is frequently cited as a meaningful advantage over some rivals. Android users benefit most from this capability.

Some reviewers flag potential latency for gaming because low-latency Bluetooth codecs are missing; wired USB-C listening is the safer option when sync matters.

Audio-video sync is usually described as low-latency for movies and TV, especially when features are working properly. A couple of reviews report occasional lip-sync hiccups during TV Audio Swap that were resolved by reconnecting or pausing playback.

Bass hits with satisfying punch and extension for most listeners, but it is not a true bass-cannon and some reviewers want a stronger bass-boost or tighter control.

Bass is commonly described as full and controlled, helping the Ace feel rich and premium. Some reviewers want more rumble and impact for movies, while others feel the default tuning can lean a bit bass-forward compared with neutral targets.

Battery life is the headline feature: 70 hours with ANC on and up to 100 hours with ANC off is repeatedly highlighted and often backed up by real-world use. The battery is not generally described as user-replaceable; Marshall instead focuses on battery preservation settings to help extend lifespan.

Battery life is generally reported around the advertised 30 hours with ANC, and several reviewers call it a strong point. A few wish it were longer, but most agree it is competitive in the premium class.

Bluetooth stability is generally reliable in daily use, with Bluetooth 5.3 and LE Audio readiness mentioned and few drop-out complaints.

Bluetooth stability is mostly reported as solid with reliable day-to-day connections. Some reviews mention brief dropouts or stutters, especially around early firmware or when using TV Audio Swap.

Build quality is generally rugged and travel-ready with an emphasis on durability and repairability, though a few sources mention minor creaks or quirks.

Build quality is typically described as premium and well-finished, with sturdy materials and a polished look. A few reviews mention early quirks or software-related rough edges, but physical construction is rarely the main complaint.

The multi-directional control knob and dedicated buttons are widely praised as intuitive, tactile, and easier to use than touch controls.

Cable quality and design are serviceable, with included cables for charging and wired use, but some miss the older coiled cable style or find adapters less convenient.

Cable quality is mostly fine, but at least one review explicitly complains that the included USB-C cable is too short for comfortable desktop or couch use.

The included hard case gets high marks for protection and premium feel (velvet interior, compact footprint), though a few find it thick or bulgy.

The included case is usually praised as protective and slim, and it looks premium on the outside. A few reviewers dislike the material feel, zipper behavior, or the finicky fit when packing the headphones away.

Charging is fast and convenient via USB-C, with common claims of about 12 hours of playback from a short charge and full recharge around a couple of hours.

USB-C charging and fast-charge behavior are widely praised, with multiple reviews citing short top-ups that deliver hours of use. Full charge times and convenience compare well against Lightning-based rivals.

Clamping force is generally light, with multiple reviewers reporting minimal pressure and little to no head squeeze.

Codec support is basic for the price: SBC and AAC are the norm, with some mentions of LE Audio/LC3, but there is no mainstream hi-res Bluetooth path.

Codec support is a key talking point: AAC for iPhone, aptX and aptX Lossless via Snapdragon Sound for compatible Android, plus wired USB-C audio. One review notes the lack of LDAC, so codec completeness depends on what you expect.

Long-session comfort is a standout: low weight, plush pads, and pressure-distributing headband design earn frequent praise, with only occasional complaints about heat buildup.

Comfort is one of the strongest consensus positives: many reviewers say the Ace disappears on the head for long sessions. Some note the cups can feel tight for larger ears or get warm, but comfort is still often ranked top tier.

Design is classic Marshall amp-inspired with textured finishes and brass/gold accents; it feels premium to fans but can be polarizing for those who prefer modern styling.

Design is broadly seen as sleek, minimalist, and premium, with physical controls that many find more reliable than touch pads. Cosmetic preferences vary, but the Ace generally scores high on aesthetics.

Earcup padding is repeatedly described as very plush and supportive, improving seal and comfort, though it can feel warm over extended wear.

Multiple reviews mention wide swivel/rotation and folding behavior that helps the headphones sit flat, pack smaller, and fit securely into the compact case.

The 5-band EQ is responsive and helpful for tailoring the signature sound, though it is not as granular as more advanced EQ systems.

EQ customization is frequently described as basic, often limited to simple bass and treble adjustments. It helps fine-tune warmth but is less flexible than multi-band EQs offered by several competitors.

Adjustment and fit mechanisms are practical, with discrete steps and a comfort strap/headband design that helps distribute pressure and maintain a stable seal.

Hinges and structure are often described as bendy and durable, but at least one review notes odd twisting behavior when you turn your head.

Included accessories are typically strong for the category: a hard case plus cables for charging and USB-C-to-3.5mm wired listening are commonly noted.

Included accessories, especially the hard case and cables or adapters, are generally viewed as generous for the category. A couple of reviewers still wish for longer cables or more flexibility, but the bundle is mostly well received.

Instrument separation is typically above average with clear placement, but layering can compress or get congested as mixes get busier.

Instrument separation and imaging are often highlighted as a strength, with good layering and placement for a wireless ANC headphone. Even mixed reviews tend to credit the Ace for clarity in complex mixes.

Reviews that address LDAC note it is not supported, reinforcing that these prioritize battery life and simplicity over hi-res wireless codecs.

At higher volumes, many report clean playback with little obvious distortion, though a few note dynamic compression or a ceiling that flattens crescendos.

Noise handling on calls is a relative strength, with several tests showing good wind and background-noise suppression, though a few note it can still struggle in very noisy offices.

Microphone noise reduction is often described as effective at suppressing background noise, though not always the best in class for wind or the noisiest streets. Overall, most reviewers consider it reliable for calls.

Call quality ranges from clear in quiet environments to merely decent in louder settings; it is generally usable for everyday calls but not always meeting-grade.

Call quality is generally rated good to very good, with clear speech in typical environments. A few reviews call it average or slightly muffled, and one notes updates aimed at improving the microphones over time.

Midrange is generally strong for guitars and vocals, though some note either a slight mid dip (snare/vocals) or occasional mid-forward congestion on busy tracks.

Midrange is typically clear and pleasant for vocals, though a few reviews note mild recession depending on the track and default tuning. With light EQ, several reviewers say vocals regain balance easily.

Multi-platform compatibility is generally strong for phones and computers, and the Ace can also integrate with compatible Sonos soundbars. The biggest platform caveats are codec differences (Android vs iOS) and which devices support specific Sonos features.

Multipoint is widely reported to work well for two devices, though some wish for a device-management list and note occasional confusion when mixing wired and Bluetooth sources.

Multipoint is commonly praised for convenience and generally works well for hopping between phone and laptop. One review reports clunky or inconsistent behavior, so it is not universally flawless.

Passive isolation is strong thanks to a very good seal from the pads, helping block higher-frequency noise even before ANC is enabled.

Portability is excellent: the cups swivel/fold and the headphones collapse into a very compact shape that fits a small travel case.

The Ace folds flat but does not fold into a compact bundle, so portability depends heavily on bag space. The case is often described as slim, but still fairly wide.

Preset EQ profiles are useful and easy to swap, with bass-boost and other tonal shifts helping different genres, though a few reviewers find boosts could go further.

Replaceable earpads are a strong point, with twist-off pads that are easy to remove and swap, supporting long-term maintenance.

Replaceable, often magnetically attached earpads are praised as a practical, premium touch for long-term ownership. Reviewers generally like the ease of removing and reattaching pads.

Wear detection is available for auto play/pause, but experiences vary from fine to slightly slow or occasionally over-sensitive; it can usually be disabled.

Sidetone is highlighted as a useful calling feature when available, feeding some of your own voice back naturally so you do not over-project. Not every review treats it as essential, but those who mention it tend to be positive.

Setup is straightforward and the app layout is easy to navigate, but some reviewers note missing premium conveniences like adaptive ANC behavior or deeper device management.

Setup and software are mixed: many find pairing straightforward, while others report app detection issues, feature rollouts that arrive later, or firmware updates that take patience. Updates have also meaningfully improved ANC and home-theater features over time.

Across reviews, sound is lively and engaging with a clear lean toward rock-focused tuning, but it stays enjoyable for many genres once EQ is applied. Wired listening works via USB-C using the included cable and is often described as clean and low-latency, but convenience varies because there is no built-in 3.5mm jack and some report you may need power for wired use.

Sound quality is generally praised as warm, smooth, detailed, and spacious, making it easy to enjoy for long sessions. The recurring critique is that it is not always as punchy, dynamic, or incisive as the very best at this price, and the limited EQ means you cannot fully reshape the signature.

Soundstage is decent for a closed-back ANC headphone but not the widest; some tracks can feel narrow or cluttered unless you use the Soundstage processing.

Soundstage is frequently called spacious for a closed-back, and it becomes more enveloping with spatial audio enabled. Reviews describing movie playback often emphasize the wide, out-of-head presentation.

Soundstage/spatial processing is a fun extra with adjustable room feel, but most agree it is not true immersive spatial audio and can sound synthetic on some tracks.

Spatial audio and Dolby Atmos support are widely considered a headline strength, especially for movies and TV, with head tracking adding immersion for many listeners. A minority see it as a gimmick for music, but overall sentiment is strongly positive.

Stability on the head is usually good for everyday use, but one review notes slipping when sweaty. If you plan on workouts, fit stability and heat build-up can be a consideration.

Several reviews highlight recycled or sustainability-minded materials, positioning these as more eco-considerate than many direct rivals.

Transparency mode is usable and adjustable, but opinions vary: some find it natural and clear, while others notice hiss and weaker reproduction of deeper voices.

Transparency or Aware mode is consistently described as natural and easy for conversations, often compared favorably with top competitors. A few reviewers still prefer Apple or Bose, but overall sentiment is very positive.

Treble is crisp and energetic, yet several reviews mention brightness, sibilance, or fatigue on higher notes unless you tame it with EQ.

Treble is usually characterized as clean and non-fatiguing, avoiding harshness. A few listeners want more sparkle and air, especially compared with brighter, more energetic rivals.

USB-C is the single physical port for charging and wired audio, which keeps things simple but also means no dedicated 3.5mm jack.

USB-C is consistently appreciated for both charging and wired audio, and many reviews call it a clear win over older Lightning implementations. It also supports practical desktop and travel use cases.

Voice assistant access is supported through the customizable button and app settings, making it easy to trigger assistants or shortcuts without touching your phone.

The headphones get loud without needing extreme volume, with multiple reviewers noting comfortable listening well below 100% volume.

Most reviewers find music playback loud enough, but TV Audio Swap volume is repeatedly described as quieter than music. At least one reviewer also reports a low-volume floor or coarse steps that make quiet listening harder.

There is no stated water or sweat resistance rating in the reviews, so these are best kept away from rain and workouts.

Multiple reviews point out there is no official IP rating, making the Ace a weaker pick for workouts, heavy sweat, or rain exposure. Some still use it casually at the gym, but it is not positioned as a sport headphone.

Weight is consistently called light for the class (around the mid-200g range), contributing strongly to comfort and portability.

Weight comfort is routinely praised, especially compared with heavier metal competitors. The lighter feel is a major contributor to long-session wearability.