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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-26 · 7 min read · Independent comparison
• Amazon Renewed SENNHEISER Momentum 4 — biggest strength: up to 60 hours of playback, a lightweight fold-flat over-ear design, and aptX Adaptive over Bluetooth 5.2 with a 2.5/3.5mm jack as a backup.
• Amazon Renewed SENNHEISER Momentum 4 — biggest trade-off: it's a renewed unit with a 90-day limited warranty, and the plastic build won't feel as dense as a premium flagship.
• Edifier STAX Spirit S10 — biggest strength: planar magnetic drivers in a true-wireless in-ear, Qualcomm Snapdragon Sound with aptX Adaptive and aptX Lossless, LDAC and LHDC 5.0, plus a six-mic array for calls.
• Edifier STAX Spirit S10 — biggest trade-off: only about 6 hours per charge, an in-ear fit that some people just don't get along with, and a 15-minute charge time that keeps you tethered to the case more often.
• Pick the Momentum 4 if you want one pair of headphones for long days, travel and wired listening.
• Pick the STAX Spirit S10 if you want maximum codec flexibility, in-ear portability and the lowest wireless latency of the two.
The Momentum 4 is the endurance pick here. Sennheiser rates it at up to 60 hours of playback, and fast charging adds roughly 6 hours from a 10-minute top-up. That's a spec that changes how you live with a headphone: you can fly long-haul, work a full week of commutes, or leave it in a bag for days and not think about a charger. Nothing in the STAX Spirit S10's sheet comes close to that number.
Sound-wise, the sheet points to a 42mm dynamic transducer system with aptX Adaptive, an impedance of 470 ohm and a sensitivity of 106 dB, plus a frequency range up to 22 kHz. The high impedance figure is worth noting — it suggests the Momentum 4 leans on its own amplification rather than on your phone's output, which is typical of this class. Tuning is adjustable through the Sennheiser Smart Control app with EQ, presets and sound modes, so you're not stuck with one voicing.
Adaptive Noise Cancellation adjusts to your surroundings, and Adjustable Transparency Mode lets outside sound in without pulling the headphones off. Four digital beamforming mics handle voice pickup and wind-noise suppression, and the controls run through voice and the app rather than physical buttons. Bluetooth range is listed at 10 meters.
Edifier STAX Spirit S10: Who It's For
The STAX Spirit S10 goes the other direction: it's an in-ear true-wireless pair built around a planar magnetic driver. Edifier describes it as the first wireless planar magnetic noise-cancelling earbuds, using a 12mm planar driver with an ultra-thin 10μm diaphragm on a 2μm polymer substrate, and a second-generation EqualMass wiring layout to keep weight distribution even and distortion low. If you've only heard dynamic-driver earbuds, the pitch here is speed and detail rather than sheer punch.
The codec list is the headline for anyone searching around aptX Adaptive. It supports the full Qualcomm Snapdragon Sound suite — aptX Audio, aptX Adaptive and aptX Lossless — plus LDAC and LHDC 5.0 for wireless hi-res. Bluetooth is 5.4, and the listed audio latency is 89 milliseconds, which is a genuinely useful figure if you game or watch video on the go. Impedance is 16 ohm with a frequency response up to 40 kHz, so these are easy to drive.
Noise cancellation is third-generation adaptive hybrid ANC, and calls get three mics per earbud — six in total — with aptX Voice at a 32kHz calling bandwidth for clearer speech. Multipoint lets you stay connected to two devices at once, and a wear sensor pauses and resumes automatically when you take an earbud out. You get seven pairs of ear tips to dial in fit, touch controls, and customisation via the EDIFIER ConneX app. The enclosure mixes metal and plastic, there's no headphone jack, and the rating is IP54.
Who should buy it: Android users who want aptX Adaptive or aptX Lossless, anyone who games or watches video and cares about latency, people who take a lot of calls, and travellers who prefer earbuds to a headband. Who should skip it: long-haul flyers who can't accept roughly 6 hours of playback per charge, anyone who dislikes in-ear pressure, and iPhone users who won't be able to use the Qualcomm codec suite at all.
• Best for battery life → Amazon Renewed SENNHEISER Momentum 4. Up to 60 hours versus about 6 hours is not a close contest.
• Best for aptX Adaptive flexibility → Edifier STAX Spirit S10. It covers aptX Audio, aptX Adaptive and aptX Lossless, plus LDAC and LHDC 5.0.
• Best for lowest latency → Edifier STAX Spirit S10. The listed 89 ms figure matters for gaming and video.
• Best for long-haul travel → Amazon Renewed SENNHEISER Momentum 4. Fold-flat design, over-ear comfort, airplane adapter in the box, and a charge that lasts the trip.
• Best for calls on the move → Edifier STAX Spirit S10. Six mics with aptX Voice and a 32kHz calling bandwidth.
• Best for wired listening → Amazon Renewed SENNHEISER Momentum 4. It's the only one of the two with a 2.5/3.5mm jack.
• Best for portability → Edifier STAX Spirit S10. In-ear earbuds in a case beat a full-size headphone in a bag.
• Best for switching between laptop and phone → Edifier STAX Spirit S10. Multipoint is explicitly listed.
• Best for a renewed-unit buyer who wants a short warranty window → Amazon Renewed SENNHEISER Momentum 4. It's covered by a 90-day limited warranty, while the STAX Spirit S10 carries a 1-year manufacturer warranty.
If I had to pick one, I'd take the Edifier STAX Spirit S10. In my opinion the codec coverage is the deciding factor for anyone specifically hunting aptX Adaptive: aptX Adaptive, aptX Lossless, LDAC and LHDC 5.0 in one pair of earbuds, plus Bluetooth 5.4, multipoint and an 89 ms latency figure, covers more real-world situations than a single over-ear option. The Momentum 4 wins on endurance and comfort and it's the better travel companion — but 60 hours doesn't help you if you're an Android user chasing the lowest-latency, highest-codec wireless link. If battery life is your number one worry, flip the decision and buy the Sennheiser instead. Either way, check the current price on Amazon before you commit.
what is aptx adaptive headphones
aptX Adaptive is a Qualcomm Bluetooth codec that adjusts its bitrate and latency based on what you're doing — higher quality for music, lower latency for video and games. Headphones that support it, like the Momentum 4 and the STAX Spirit S10, need a compatible source device, typically a recent Android phone or a Snapdragon Sound laptop.
The Momentum 4, clearly. It's rated at up to 60 hours of playback with fast charging that adds around 6 hours in 10 minutes. The STAX Spirit S10 is rated at about 6 hours per charge, with a 15-minute charge time.
Yes. The sheet lists support for the full Qualcomm Snapdragon Sound suite — aptX Audio, aptX Adaptive and aptX Lossless — plus LDAC and LHDC 5.0. You'll need a source device that supports those codecs to actually use them.
It's the only one of the two with a jack. The package includes a USB-C charging cable plus a 3.5mm/2.5mm audio cable and an airplane adapter, so you can go wired when you want. The renewed unit is backed by a 90-day limited warranty.
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