Based on our overall comparison score, Marshall Monitor III ANC rates higher at 84/100 versus 78/100 for Sonos Ace — a 6-point lead. Marshall Monitor III ANC is the stronger overall pick, though the right choice still depends on which specs matter most to you; the full spec table above breaks down every difference.
Marshall Monitor III ANC vs Sonos Ace
Updated Sep 2026 · Scored by the Let’s Compare Data Engine · How we score
For most buyers the Marshall Monitor III ANC is the better pick — it scores 82/100 to the Sonos Ace's 73, leading on Battery and Comfort & Build. Choose the Sonos Ace instead if you want to spend less.
- Sound quality isn't scored yet (we have no measured audio data), so the score covers features, battery, noise cancelling and build.
Verdict
Our overall take, at a glance
Key takeaways
- Marshall Monitor III ANC leads Sonos Ace overall by 9 points (82 vs 73 out of 100).
- Marshall Monitor III ANC stands out on Battery Life (ANC On): 70 h (133% more), Comfort & Build Weight: 250 g (20% less).
Marshall Monitor III ANC leads overall
Marshall Monitor III ANC
82
Sonos Ace
73
Why it stands out
- Battery Life (ANC On): 70 h (133% more)
- Comfort & Build Weight: 250 g (20% less)
In-depth analysisAI
AI-generated from the cited sources — may be incomplete or inaccurate; verify important details before deciding · generated Sep 2026.
Marshall Monitor III ANC
The Marshall Monitor III ANC is a pair of premium over-ear wireless headphones designed for music enthusiasts who value classic styling alongside modern noise-canceling technology. It features active noise cancellation, a highly collapsible design for portability, and a signature rugged aesthetic. This model aims to compete with major flagship headphones by balancing tactile physical controls with extended battery performance.
Best for Travelers needing maximum battery longevity between chargesBest for Listeners who prefer physical, tactile controls over touch-sensitive panels
Pros
- Exceptionally long battery life ideal for multi-day use
- Highly collapsible design makes them easy to pack and transport
- Tactile multi-directional control knob offers intuitive playback adjustments
- Durable, classic design inspired by iconic amplifier styling
Cons
- Active noise cancellation performance may not entirely match the industry-leading isolation of key competitors
Sonos Ace
The Sonos Ace is a premium pair of over-ear wireless headphones retailing at $450, representing the audio brand's first foray into the personal portable space. While they function primarily as standard Bluetooth headphones rather than Wi-Fi-enabled music streamers, they offer unique integration with Sonos home systems through a physical 'TV Audio Swap' feature. They are designed for consumers who prioritize active noise cancellation, high-end comfort, and private home-theater listening.
Best for Private home theater listening late at night without disturbing othersBest for Frequent travelers requiring long-wear comfort and active noise cancellation
Pros
- Exceptional physical design and wearing comfort for extended sessions
- TV Audio Swap feature allows seamless audio transition from compatible Sonos soundbars
- Highly effective active noise cancellation and transparency modes
- Capable sound reproduction with dynamic spatial head tracking
Cons
- Premium price point of $450 makes them a significant financial investment
- Launched with some software features unfinished and slated for future updates
- Cannot stream music over Wi-Fi, limiting integration with standard Sonos multi-room setups
Value for Money
Which is the better deal for the price
Pre-filled with launch prices where known — enter today's price for an up-to-date check. Use the same currency for both.
Marshall Monitor III ANC
Sonos Ace
Physical Comparison
Weigh them up, then compare real dimensions in 3D
Marshall Monitor III ANCSonos Ace
Sonos Ace is 62 g (25%) heavier than Marshall Monitor III ANC.
Review Videos
Hand-picked expert reviews for each product
Detailed Specifications
The full spec sheet, side by side
Frequently Asked Questions
Common questions about Marshall Monitor III ANC vs Sonos Ace comparison
Marshall Monitor III ANC and Sonos Ace are compared side by side above across every spec in the headphones category — including performance, features and design — each scored 0–100 so you can see exactly where one leads the other. Our overall scores are 84/100 for Marshall Monitor III ANC and 78/100 for Sonos Ace.
At launch, Marshall Monitor III ANC was the more affordable option ($350) versus Sonos Ace ($449). Weigh that against the overall scores (84/100 vs 78/100) and the value-for-money meter above to judge whether the higher-rated model justifies its price for your needs. Current retail prices vary — check the retailer.
If you want the higher-rated headphones option overall, Marshall Monitor III ANC (84/100) edges out Sonos Ace (78/100). But if Sonos Ace is cheaper or stronger on the specific specs you care about, it can still be the better buy — use the spec table and strengths profile above to decide.
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