If you want immersive over-ear listening with Dolby Atmos, dynamic head tracking, and noise cancellation, choose Sonos Ace Noise Cancelling; if you need exceptionally long battery life and replaceable earcups and battery, choose Cambridge Audio Melomania P100. For side sleepers, though, neither is designed as a compact sleep headphone: both are over-ear models, so I’d weigh their comfort features against how you sleep.
Sonos Ace Noise Cancelling vs Cambridge Audio Melomania P100 at a Glance
• Cambridge Audio Melomania P100’s biggest strength: A stated 100-hour battery life and user-replaceable battery and earcups. Trade-off: Its listed features do not include Dolby Atmos or dynamic head tracking.
• Sonos Ace suits: Listeners who value spatial audio, ANC, and the option to swap compatible Sonos soundbar audio to the headphones.
• Cambridge Audio Melomania P100 suits: Listeners who want long stretches between charges, adjustable EQ, adaptive ANC, and replaceable parts.
• For either pick: These are over-ear headphones, not small in-ear or open-ear designs. That matters if you’re specifically shopping for headphones for side sleepers.
Sonos Ace is for someone who wants a feature-rich over-ear listening setup rather than a small headphone to wear in bed. Dolby Atmos and dynamic head tracking are its distinguishing audio features: the sound can be presented spatially, with the experience responding to head movement. It also supports lossless audio over Bluetooth or USB-C, giving you two stated connection options for that kind of listening.
Active noise cancellation is another central part of the package. It is intended to reduce outside sound and help you focus, whether you’re listening at home or using the headphones in a noisier setting. The listed battery life is up to 30 hours with ANC enabled, and a three-minute charge is stated to provide up to three hours of playback. That quick-charge detail could be useful when you realize the headphones need power shortly before you leave.
The comfort design uses memory foam and soft vegan leather, with a fit described as accommodating different head shapes, hairstyles, and accessories. Sonos also supports TV Audio Swap with compatible Sonos soundbars, including Arc Ultra, Arc, Arc SL, Beam models, and Ray. That makes Ace especially relevant to someone who wants to move compatible soundbar audio to headphones. It pairs over Bluetooth and does not require the Sonos app for basic setup and use, although select features need to be enabled in the app.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-23 · 8 min read · Independent comparison
Who should skip it: Skip Sonos Ace if your main goal is a battery that lasts for days between charges, or if you need an in-ear shape for side sleeping.
Cambridge Audio Melomania P100 is the stronger fit for someone who wants to think about charging less often. Its stated battery life is 100 hours, compared with up to 30 hours for Sonos Ace when ANC is enabled. The sheet also describes a five-minute charge as providing up to four hours of playback. Those figures make the P100 an appealing choice for long listening stretches, travel, or a routine where frequent charging is inconvenient.
Its longevity story goes beyond battery runtime. The battery and earcups are user-replaceable, so those parts are not presented as permanently fixed components. That is a practical distinction for someone who wants the option to replace worn earcups or the battery rather than treating the whole headphone as a single sealed unit. The product also includes adaptive active noise cancellation, wear detection, multipoint connection, and a seven-band adjustable EQ through the Melomania Connect app. The EQ gives listeners a way to adjust the sound to their preferences instead of being limited to one fixed tuning.
For compatible listening setups, the P100 lists aptX Lossless and aptX Adaptive, alongside Bluetooth connectivity and a 3.5 mm jack. Its listed controls include the app, Siri, and Google Assistant. These are useful options to consider if you want app-based adjustments, voice-assistant access, or a wired connection. But the core shape is still over-ear, so long battery life does not make it a more sleep-friendly form factor.
Who should skip it: Skip the P100 if Dolby Atmos with dynamic head tracking or Sonos soundbar TV Audio Swap is the feature you specifically want.
Cambridge describes the design as intended to support long-listening comfort, but the available details do not give a sleeping-specific design or a waterproof rating. If you want noise cancelling in ear earbuds for side sleepers, this is not an in-ear alternative. The replaceable earcups may help with upkeep over time, but they do not eliminate the physical issue of lying with an earcup between your head and pillow.
Side-by-Side: Which Should You Choose?
• Best fit for spatial audio with head tracking → Sonos Ace. Its listed Dolby Atmos feature is paired with dynamic head tracking; the P100’s supplied details do not list either feature.
• Best fit for long battery life → Cambridge Audio Melomania P100. Its stated 100 hours is a substantial advantage over Ace’s up to 30 hours with ANC enabled.
• Best fit for compatible Sonos TV listening → Sonos Ace. It can swap audio with specified Sonos soundbars, a feature that may suit a shared living room where you want to listen through headphones.
• Best fit for adjustable sound → Cambridge Audio Melomania P100. Its seven-band EQ and DynamEQ are useful if you want sound adjustments available through its app.
• Best fit for replaceable components → Cambridge Audio Melomania P100. Both the battery and earcups are user-replaceable, giving it a practical maintenance advantage.
• Best fit for lossless listening over USB-C → Sonos Ace. Sonos explicitly lists lossless audio over USB-C as well as Bluetooth; Cambridge lists aptX Lossless and a 3.5 mm connection.
• Best fit for side sleeping → Neither is an obvious choice. Both are over-ear headphones. If lying on your side is the priority, look closely at the physical form you need rather than choosing based on ANC or battery figures alone.
First, be clear about what “for side sleepers” means in your case. If you want headphones for listening while sitting up before bed, either over-ear option may be worth comparing for its comfort and sound features. If you plan to keep them on while lying on your side, the earcups are the key concern: neither product is described as an in-ear or open-ear design, and neither sheet establishes a sleeping-specific fit. Comfort language about long listening does not guarantee that a headphone will feel comfortable under pillow pressure.
Next, decide whether you’ll make use of the standout features. Sonos Ace makes the stronger case if spatial audio and TV Audio Swap are meaningful to your routine, especially if you own one of the compatible Sonos soundbars. Its Bluetooth pairing also means basic setup does not depend on the Sonos app, though select features do require app enablement. Cambridge’s app-based seven-band EQ, adaptive ANC, wear detection, and multipoint connection may matter more if you want controls and listening adjustments in one place.
My Verdict
I would choose Cambridge Audio Melomania P100 for everyday over-ear listening because its 100-hour battery life and user-replaceable battery and earcups are practical advantages I would value over time. Sonos Ace is the more compelling pick if Dolby Atmos, head tracking, or compatible soundbar audio swapping is central to how you listen. For side sleepers, I would not treat either as a purpose-built sleep option: both are over-ear headphones, so the form factor deserves careful thought before anything else.
Cambridge Audio Melomania P100 lists 100 hours of battery life. Sonos Ace lists up to 30 hours with active noise cancellation enabled, so the P100 has the longer stated runtime.
Neither is specifically described as a side-sleeping headphone. Both are over-ear designs, so their earcups may be an issue against a pillow; shoppers who need a sleep-focused fit should consider the shape as carefully as the audio features.
Sonos Ace lists active noise cancellation, while Cambridge Audio Melomania P100 lists adaptive active noise cancellation. The product details do not provide a directly comparable measurement, so the feature names alone do not establish which blocks more sound.
If waterproofing or an open-ear design is essential, these specifications do not establish either as a match.
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