How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a wireless, sweat-proof gym companion with active noise cancelling and a secure hooked fit, choose Anker Soundcore Sport X20; if you need a wired, USB-C in-ear pair tuned for balanced everyday listening, choose Sennheiser CX 80U.
• Anker Soundcore Sport X20 — biggest strength: rotatable, extendable ear hooks (up to 30 degrees of rotation and 4mm of extension) plus an IP68 dust- and waterproof build and 48 hours of total playtime with the charging case.
• Anker Soundcore Sport X20 — biggest trade-off: it's fully wireless over Bluetooth only, so there's no headphone jack and you're dependent on battery and charging.
• Sennheiser CX 80U — biggest strength: a wired USB-C connection with a balanced, detail-focused sound and three ear tip sizes (S, M, L) for a customizable in-ear seal.
• Sennheiser CX 80U — biggest trade-off: no active noise cancelling, no battery, and no hooks — isolation depends entirely on how well the tips seal in your ears.
• Choose Anker Soundcore Sport X20 if you train hard, sweat a lot, and want noise cancelling and a locked-in fit without a cable.
• Choose Sennheiser CX 80U if you want a simple plug-in wired pair for commuting, calls, and relaxed listening where charging never enters the picture.
The Sport X20 is built around one idea: staying put while you move. Anker gives it ear hooks that rotate up to 30 degrees and extend by 4mm, so you can angle the nozzle and hook to match your ear shape instead of fighting a fit that keeps slipping. For anyone who has ever had a bud pop out mid-set, that adjustability is the headline feature. It's paired with an IP68 rating, which is the kind of dust and water protection that makes sense for sweat, rain, and the bottom of a gym bag.
Sound and focus are the next layer. Anker uses 11mm dynamic drivers with its BassUp tuning, so the low end is pushed forward — good for motivation-driven playlists and podcasts you want to feel. Active noise cancelling, both manual and adaptive, is there to flatten out the gym: clanging weights, background chatter, the treadmill hum. It won't erase everything, but it takes the edge off. On battery, the case carries a 580 mAh cell rated for 48 hours total, with about 12 hours per charge and a 12-hour charge time, so you're charging the case, not the buds, most weeks.
So who should buy it? People who train, run, or lift and want a wireless pair that survives sweat and stays anchored. Touch controls handle volume, and Bluetooth 5.3 keeps the connection current with a 10-meter range. Who should skip it? Anyone who wants a cable, doesn't want to think about charging, or prefers a neutral, uncolored sound — the BassUp tuning and ANC are a specific flavor, not a blank canvas. If that's you, the wired route below is the better match.
The CX 80U is the opposite philosophy: keep it simple, keep it wired, get the fundamentals right. It plugs in over USB-C, so there's no pairing, no battery, and no charging case to lose. For a lot of people that's the entire appeal — you grab it, plug it in, and it works. The 10-gram build is light enough to forget you're wearing it, and the housing is plastic with silicone tips, which keeps it comfortable for longer sessions.
The sound signature is deliberately balanced. Sennheiser tunes it to avoid extremes in the highs and lows, with a frequency response of 17 Hz to 20,000 Hz, 28 ohm impedance, and 119 dB sensitivity. That's an easy load to drive, and the tuning is aimed at hearing detail rather than being hit over the head with bass. Three ear tip sizes (S, M, L) let you dial in the seal, and a good seal is what delivers the ambient noise reduction here — there's no active system, just passive isolation from a proper fit.
The inline one-button remote handles calls and playback, which covers the basics on a commute or a walk. Who should buy it? Commuters, students, office workers, and anyone who wants a dependable wired pair for calls and music without babysitting a battery. Who should skip it? Runners and gym-goers who need hooks and water resistance, and anyone who wants active noise cancelling — this is isolation by fit, not by electronics.
• Best for workout and gym use → Anker Soundcore Sport X20. The rotatable ear hooks, IP68 rating, and secure fit are designed for movement.
• Best for active noise cancelling → Anker Soundcore Sport X20. Manual and adaptive ANC are built in; the CX 80U relies on passive isolation only.
• Best for battery life and cable-free listening → Anker Soundcore Sport X20. 48 hours total with the case, roughly 12 hours per charge.
• Best for wired reliability and zero charging → Sennheiser CX 80U. USB-C connection, no battery, nothing to top up.
• Best for balanced, detail-first sound → Sennheiser CX 80U. A neutral tuning across 17 Hz–20,000 Hz rather than a bass-forward signature.
• Best for a lightweight, low-fuss everyday pair → Sennheiser CX 80U. Just 10 grams with a simple inline remote for calls and playback.
• Best for strong, consistent bass → Anker Soundcore Sport X20. 11mm dynamic drivers with BassUp tuning push the low end.
• Best for fit flexibility in the ear canal → Sennheiser CX 80U. Three tip sizes (S, M, L) let you fine-tune the seal.
In my opinion, the Anker Soundcore Sport X20 wins for anyone whose listening happens while moving. The adjustable hooks, IP68 protection, ANC, and 48-hour case battery solve the exact problems that make earbuds fail at the gym. But if your listening is desk-bound or on a commute, I'd take the Sennheiser CX 80U — the wired USB-C connection, balanced tuning, and three tip sizes make it the more honest everyday tool, and you never think about charging. Pick by how you listen, not by which one sounds more impressive on paper. If price is the deciding factor, check the current price on Amazon before you commit.
FAQ
how to make wired earbuds stay in ear
how to put earbuds in your ear
Pull your ear gently up and back to open the canal, then insert the tip and let it settle. With the CX 80U's in-ear design, a light twist as you seat it helps the silicone tip lock in. Don't jam it — comfort and seal matter more than depth.
how to keep earbuds in ears
Fit is everything. If the CX 80U keeps working loose, size up or down on the tips and reseat. If you need mechanical anchoring for movement, the Sport X20's ear hooks — rotatable up to 30 degrees and extendable by 4mm — are the more reliable answer for running and lifting.
how to make apple wired earbuds stay in ear
The principle is the same across wired buds: seal and angle decide whether they stay put. The CX 80U takes a USB-C connection and gives you three tip sizes to dial the fit in, which is the main lever you have on any wired in-ear pair for keeping them seated.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.
See also: Anker Soundcore Sport X20 vs JBL Endurance Race 2, Anker Soundcore vs TAGRY Headphones True: Wired in Ear, Anker Soundcore AeroFit 2 vs EarFun OpenJump Open Ear