How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-25 · 6 min read · Independent comparison
• JVC Black — biggest strength: "Nozzle Fit" earpieces plus two extra nozzle sizes, a sweat/splash-proof build, and a 3.3 ft color-matched cord. Extremely light at 4.8 g.
• JVC Black — biggest trade-off: Bare-bones audio control. Noise control is listed as None, and there's just a single-button remote with a mic.
• CNWUJASS AK3FILE — biggest strength: A titanium-plated dynamic driver, metal circular panel with transparent resin housing, passive noise cancellation, and an HD electret microphone with a multifunction key.
• CNWUJASS AK3FILE — biggest trade-off: Heavier at 22.68 g, purple resin styling won't suit everyone, and the 10–20KHz range trades some upper extension for a fuller low end.
• Buy JVC Black if you want a minimal, ultra-light sweat-proof set for running and gym work.
• Buy CNWUJASS AK3FILE if you want one wired pair to cover music, calls, gaming, and monitoring.
The JVC Black is a purpose-built workout earbud, and the spec sheet says so plainly. The headline feature is the "Nozzle Fit" earpiece — a rounded-tip in-ear shape designed so the bud stays put instead of working its way loose mid-stride. JVC also includes two extra nozzle sizes, which matters more than people expect: a secure fit is mostly a sizing problem, and having options in the box lets you dial in the seal rather than settling for whatever's pre-installed.
Then there's the sweat and splash resistance. JVC describes it as a durable design built for long life, which is exactly the failure point on cheap earbuds — sweat kills them. Pair that with a 4.8 g weight and you get something you genuinely forget is there. The 3.3 ft color-matched cord is a deliberate choice too: long enough to route from a pocket or armband to your ears without yanking, and short enough that it isn't flapping around.
Where it gives ground is features. Noise control is listed as None, so you're relying on the physical seal of the nozzle tips rather than any active system. The control scheme is a single-button remote with a mic — you get basic call and track control, not a full transport panel. And the frequency range is the standard 20–20,000 Hz with a dynamic driver.
Who should buy it: runners, lifters, and anyone who wants a light, sweat-proof wired bud with a fit they can actually adjust, and who doesn't care about a fancy housing or a multi-button remote. Who should skip it: if you want passive noise cancellation, a metal body, or a mic tuned for voice and gaming, this isn't the one.
The AK3FILE is a different animal entirely. CNWUJASS built it around a titanium-plating dynamic moving coil driver, and the marketing language points at a wide, open sound with a deep, three-dimensional field. More concretely, the tuning is described as "American style" — full mid and low frequency, which is a recognizable signature: warm, punchy, bass-forward. If you listen to a lot of modern pop, hip-hop, or electronic, that's the profile you want.
The build is the other half of the story. The cavity uses imported resin with a transparent, colorful appearance, paired with a metal circular panel — a metal-and-resin enclosure rather than plain plastic. That's a genuinely different feel in the hand, and the 22.68 g weight reflects it. The ergonomic shape is described as derived from ear data and 3D construction, with the aim of fitting the auricle comfortably while reducing external noise interference. That's passive noise cancellation doing real work — a good seal with a denser housing blocks more of the outside world than a loose bud will.
On the spec side, you get 17 ohm impedance and 109 dB sensitivity. Low impedance plus high sensitivity means these are easy to drive — a phone or laptop will push them to volume without strain. The frequency range is listed at 10–20KHz, which extends deeper into the bass than the JVC's 20 Hz floor. The trade-off is the ceiling: 20KHz is where the JVC also tops out, so neither is reaching into extended treble territory.
The mic setup is where the AK3FILE pulls clearly ahead for anything beyond music. It uses a high-fidelity electret microphone supporting HD communication, voice, broadcast, and karaoke, with a multifunction key. The 3.5 mm connector is universal — smartphones, tablets, laptops, gaming consoles.
Who should buy it: someone who wants one wired pair for music, calls, and gaming, and who values a metal-and-resin build and a bass-forward tuning. Who should skip it: if you want the absolute lightest possible bud for sweaty runs, or you dislike purple resin styling, look elsewhere.
• Best for running and gym work → JVC Black. Sweat/splash-proof design, 4.8 g weight, nozzle-fit earpieces, two extra nozzle sizes.
• Best for bass-forward music → CNWUJASS AK3FILE. Full mid and low frequency tuning, 10Hz floor, 17 ohm / 109 dB for easy driving.
• Best for calls and voice → CNWUJASS AK3FILE. HD electret mic with a multifunction key; the JVC offers only a single-button remote and mic.
• Best for gaming and monitoring → CNWUJASS AK3FILE. The AK3FILE is explicitly pitched as a gaming headset and monitor earphone.
• Best for blocking outside noise → CNWUJASS AK3FILE. Passive noise cancellation plus a denser metal-and-resin housing.
• Best for an ultra-light, forget-it's-there fit → JVC Black. At 4.8 g versus 22.68 g, it's in a different weight class.
• Best for fit customization → JVC Black. Two nozzle sizes included, specifically to secure the seal.
• Best for build feel → CNWUJASS AK3FILE. Metal circular panel and transparent resin housing versus plain plastic.
• Best for plug-and-play simplicity → tie. Both are wired 3.5 mm with no pairing, charging, or batteries.
In my opinion, the CNWUJASS AK3FILE is the better buy for most people, because it does more jobs. The metal-and-resin build, the bass-forward tuning, the easy-to-drive 17 ohm / 109 dB specs, and the HD mic with a multifunction key make it a genuine all-rounder for music, calls, and gaming.
That said, I'd pick the JVC Black without hesitation if the gym is the main event. It's sweat-proof, 4.8 g, and comes with extra nozzle sizes to lock the fit down — and for running, that's the whole ballgame. Match the bud to the job.
FAQ
how to wear sports earbuds
how to connect bose sports earbuds
This one is brand-specific and doesn't apply here — both the JVC Black and the CNWUJASS AK3FILE are wired earbuds with a standard 3.5 mm jack. There's no pairing step. You plug them into a phone, tablet, laptop, or console and they work.
how to pair bose sports earbuds
Again, pairing is a wireless concept, and neither of these is wireless. Both list Wired as their connectivity technology and a 3.5 mm connector, so there's nothing to pair, no battery to charge, and no Bluetooth menu to fiddle with.
how to reset bose sports earbuds
There's no reset procedure for either model, because there's no firmware or wireless pairing to clear. With a wired 3.5 mm bud, "resetting" just means unplugging and replugging. Each carries a one-year warranty — parts and labor on the JVC, a one-year warranty on the AK3FILE.
Whether you're chasing a secure gym fit or a single pair that covers music, calls, and gaming, check the current price on Amazon before you decide.
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See also: JVC HAS180 vs AVAZI Earbuds, HyperX Cloud Earbuds II vs JVC Compact True: Touch Control, Matast Earbuds Sports vs Xoruezls Open Ear Earbuds