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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-23 · 6 min read · Independent comparison
• SONY MDRXB55AP — biggest strength: 12mm neodymium drivers plus Powered Bass Duct++ deliver deep, punchy EXTRA BASS over a wired 3.5mm connection, with an inline remote and mic for calls.
• SONY MDRXB55AP — biggest trade-off: It's wired, so you're tethered to your device, and there's no noise cancellation whatsoever.
• Amazon Renewed Beats Fit Pro — biggest strength: True wireless with Dynamic Active Noise Cancellation, flexible secure-fit wingtips, IPX4 sweat and water resistance, and an Apple H1 chip.
• Amazon Renewed Beats Fit Pro — biggest trade-off: It's a renewed (previously owned) product, battery life is finite at up to 6 hours with ANC, and it relies on Bluetooth rather than a cable.
• Who each pick is for: Pick the Sony if you want fuss-free wired bass on a budget and hate charging things; pick the Beats if you want wireless ANC earbuds for the gym, commute, and calls.
The MDRXB55AP is a wired in-ear headphone built around one clear idea: bass. Sony pairs 12mm neodymium dynamic drivers with Powered Bass Duct++ technology, and the result is a sound signature tuned for low-end-heavy genres — hip-hop, EDM, electronic pop, and anything that lives in the sub-bass. The frequency range runs from 4 Hz to 24,000 Hz, and the spec sheet lists a high sensitivity of 112dB/mW, which tells you these are easy to drive. Plug them into a phone, a laptop, a gaming controller, or an older MP3 player with a 3.5mm jack and they'll get loud without needing an amp.
The practical appeal here is simplicity. There's no battery to manage in daily use, no pairing, no firmware. You plug in and listen. The inline remote and mic let you take hands-free calls and skip tracks without touching your phone, and the cable uses a serrated design meant to resist snags and tangles. Sony also includes four earbud tip sizes (SS, S, M, L), which matters more than people think — a proper seal is what actually unlocks the bass these drivers are capable of. In the box you get the earbuds, a carrying pouch, and a user manual, backed by a one-year warranty. The enclosure is plastic and the color is blue.
Amazon Renewed Beats Fit Pro: Who It's For
The Beats Fit Pro is a true wireless in-ear headphone with a very different philosophy. It's built for movement and for blocking out the world. Flexible, secure-fit wingtips are the headline design feature — they tuck into the curve of your ear to hold the bud steady, which is exactly what you want during running, lifting, or any activity where a loose earbud would pop out. IPX4 sweat and water resistance backs that up, so sweat and light rain aren't a problem. Dynamic Active Noise Cancellation handles the commute and the noisy office, and a Transparency mode lets outside noise back in when you need to hear a announcement or a conversation.
The tech inside is Apple-flavored. An integrated Apple H1 chip powers fast, stable connectivity, and Class 1 Bluetooth is specified for longer range. Dual beamforming mics keep calls clear, and an accelerometer can detect when you start speaking — a genuinely useful touch for taking a call mid-workout. Battery life is up to 6 hours of playback with ANC on, and the charging case adds 18 more hours, with the case itself taking about 3 hours to charge. Controls are handled through Siri and an app rather than physical buttons.
Now the honest part. This is an Amazon Renewed product, meaning it's a previously owned unit that has been inspected and is backed by a one-year manufacturer warranty — but it is not new. If you want a sealed retail box, this isn't it. The 6-hour figure is also with ANC active, so heavy all-day users will be reaching for the case. And the Apple H1 chip's best features shine brightest when paired with Apple devices; Android users get a more limited experience.
Who should buy it? Runners, gym-goers, commuters, and iPhone owners who want wireless ANC earbuds with a fit that stays put. Who should skip it? Anyone uncomfortable with renewed electronics, anyone who wants a wired connection as a fallback, and bass-first listeners who specifically want the Sony's low-end tuning.
• Best for battery-free, always-ready listening → SONY MDRXB55AP. No charging, no pairing, just a 3.5mm plug.
• Best for noise cancellation → Amazon Renewed Beats Fit Pro. Dynamic ANC and Transparency mode are features the Sony simply doesn't have.
• Best for workouts and running → Amazon Renewed Beats Fit Pro. Secure-fit wingtips plus IPX4 sweat and water resistance are built for it.
• Best for deep bass on a wired connection → SONY MDRXB55AP. 12mm drivers and Powered Bass Duct++ are tuned for exactly this.
• Best for long listening sessions without a case → SONY MDRXB55AP. Wired means unlimited runtime; the Beats tops out around 6 hours plus 18 from the case.
• Best for iPhone users → Amazon Renewed Beats Fit Pro. The Apple H1 chip and Siri control are designed around that ecosystem.
• Best for buyers who want a brand-new, sealed product → SONY MDRXB55AP. The Beats option is renewed, not new.
• Best for hands-free calls on either → tie, depending on setup. Sony uses an inline mic; Beats uses dual beamforming mics.
In my opinion, the right call depends entirely on how you listen. If you want maximum convenience with no charging, no pairing, and a bass-forward wired sound, I'd buy the SONY MDRXB55AP — it's the simpler, more predictable product. If you want true wireless freedom, active noise cancellation, and a fit that survives a hard workout, I'd buy the Amazon Renewed Beats Fit Pro, accepting that it's renewed and that battery life is finite. For most people who've cut the headphone jack, the Beats is the more modern tool. For everyone else, the Sony just works.
Push the earbud gently into your ear canal and twist slightly until it seals. The Sony ships with four tip sizes (SS, S, M, L), so try each until the bass feels full — a loose seal is the number one reason in-ear headphones sound thin.
Wipe the earbuds and tips with a dry, soft cloth and gently remove earwax from the nozzle with a dry brush or toothpick. Never submerge them in water. That applies to both here, though the Beats Fit Pro's IPX4 rating only covers sweat and splashes, not washing.
There's nothing to open on the Sony — it's a wired earbud you simply plug in. On the Beats Fit Pro, the charging case lid flips open to reveal the buds; lift each one out and they power on and pair.
Fit is everything. The Beats Fit Pro's flexible wingtips are specifically designed to lock into your ear for stability, which is why it's the better pick for running. The Sony relies on tip size alone, so it can shift during heavy movement.
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See also: Sony WH-CH720N vs Amazon Renewed Beats Solo Buds, Amazon Renewed Beats Solo 4 vs Aurotlu, Beats Fit Pro Gen vs Back Bay Audio Runner