How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a compact, ultra-light pair of in-ear headphones that simply get out of the way, choose Sony MDRE9LP/BLU; if you need safe, kid-friendly over-ear headphones for children with a mic and a volume cap, choose JBL Junior 320.
• Sony MDRE9LP/BLU biggest strength: Tiny, ultralight in-ear design (22.68 g) with 13.5mm dynamic drivers and a secure, comfortable fit.
• Sony MDRE9LP/BLU biggest trade-off: No microphone, no volume limiting, and it's not built for kids — the age range is listed as Adult.
• JBL Junior 320 biggest strength: JBL Safe Sound caps output at 85dB, plus a built-in mic and a foldable, adjustable on-ear fit made for little heads.
• JBL Junior 320 biggest trade-off: It's much heavier (116.8 g) than the Sony, and its protection features are aimed squarely at children rather than adults.
• Pick the Sony if you're an adult who wants minimal, pocketable earphones for music on the move.
• Pick the JBL Junior 320 if you're buying for a child who needs safe volume, a mic for calls and class, and a fit that grows with them.
The Sony MDRE9LP/BLU is about as simple as headphones get, and that's the point. It's an in-ear, open-air design with 13.5mm neodymium dynamic drivers in a plastic body, weighing just 22.68 g. The angled 3.5mm plug provides strain relief, and the open-air design is intended to deliver crisp, realistic audio with deep bass. Sony also includes two pairs of silicone earbuds so you can find a more comfortable, secure fit, and the buds are shaped to sit snugly in the ear.
What it does best is disappear. It's a wired, battery-free pair of earphones you can leave in a pocket or bag, plug into a phone, tablet or laptop, and forget about. With 16 ohm impedance and a frequency response up to 22,000 Hz, it's an easy load for basically any 3.5mm source. The sound isolation is passive, so it takes the edge off background noise without sealing you off completely.
JBL Junior 320: Who It's For
The JBL Junior 320 is purpose-built for kids. Its headline feature is JBL Safe Sound, which is designed to never exceed 85dB — protecting young ears without giving up the sound kids expect. It's a wired on-ear headphone with a 3.5mm jack, and it includes a built-in microphone so a child can talk with teachers during lessons or chat with friends and family in their downtime. Controls are button-based and described as durable and child-friendly, easy for small hands to operate.
Comfort is engineered around small heads. There's a soft 12mm padded headband and round earcups that grip better and leak less sound, and the headband adjusts to fit as a child grows. At 116.8 g it's far heavier than the Sony, but it's spread across the head rather than pushed into the ear canal, which is a more natural fit for kids. The 32mm dynamic drivers run 34 ohm impedance with a 20 Hz–20,000 Hz range and passive noise cancellation. It folds flat for stashing in a backpack, and the packaging includes a JBL sticker set so kids can personalize the look. It carries a 1-year manufacturer warranty.
Who should buy it: parents and gift-givers shopping for a child who needs headphones for school, travel, road trips, or video calls, and who want a volume ceiling and a mic baked in. Who should skip it: adults who want something compact and unobtrusive. It's also not a waterproof gaming headphone — nothing in the specs claims water resistance or gaming-specific features, so don't buy it expecting either.
• Best for young children → JBL Junior 320. The 85dB Safe Sound cap, kid-sized adjustable headband and 1-year warranty are all built for this.
• Best for adults → Sony MDRE9LP/BLU. The listed age range is Adult, and the 22.68 g in-ear design suits grown-up everyday listening.
• Best for calls and class → JBL Junior 320. It's the only one of the two with a built-in microphone.
• Best for portability → Sony MDRE9LP/BLU. At under 23 g it's dramatically lighter than the 116.8 g JBL, and there's nothing to fold or adjust.
• Best for growing kids → JBL Junior 320. The headband adjusts as a child grows, and the soft 12mm pad is aimed at long-wearing comfort.
• Best for shared-fit flexibility → Sony MDRE9LP/BLU. Two pairs of silicone earbuds let you pick the seal that feels right.
• Best with a mic over ear headphones for children → JBL Junior 320. It's an on-ear design with a mic, which is exactly the combination this describes.
• Best for a sticker-loving kid → JBL Junior 320. The included JBL sticker set lets children decorate their own pair.
For a child, I'd buy the JBL Junior 320. The 85dB volume limit, the built-in mic, the adjustable kid-sized headband and the 1-year warranty are all decisions made for young ears and small heads, and that combination is hard to argue with for school and travel. For myself, I'd buy the Sony MDRE9LP/BLU: it's ultralight, wired, and does one job without fuss. If you're buying for children, the JBL is the pick. If you're buying for an adult who wants pocketable earphones, the Sony wins. Check the current price on Amazon before you commit, since that's the one variable I can't weigh for you.
Based on the specs, the JBL Junior 320 is the stronger match for small heads: it has an adjustable headband, round earcups designed for better grip, and a soft 12mm padded band. The Sony MDRE9LP/BLU is an in-ear design with two sizes of silicone earbuds, so it fits different ears rather than heads.
What headphones are good for small heads?
Look for adjustability and light pressure. The JBL Junior 320 is explicitly built for little heads, with a growing-fit headband and on-ear cups that seal without clamping hard. The Sony MDRE9LP/BLU suits smaller ears instead — its rounded-tip earbuds and two included silicone tips let you tune the fit.
Neither of these offers active noise cancelling. The Sony MDRE9LP/BLU uses passive sound isolation, and the JBL Junior 320 uses passive noise cancellation. Both reduce some outside sound, but if you specifically need active noise cancelling, neither model in this comparison is the right fit.
For a child, the JBL Junior 320 is my pick, thanks to its 85dB limit, adjustable headband and built-in mic. For an adult who wants something minimal, the Sony MDRE9LP/BLU is the better call at just 22.68 g. Match the design to the wearer's age and needs rather than to a single "best" label.
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See also: Panasonic ErgoFit vs XOSDA 10, Redskypower 5 vs GEVO Ear Pads Cushions: Small on Ear, ACANDYA 5.3 vs ROEL-PLAY in-Ear Open Fit: HIFI Stereo, DUVOSS Open Ear Earbuds vs FJX Bone Conduction Headphones