- Which is better for the gym?
- The Sony WH-CH520 is the easier pick for the gym because it is wireless and has no cable to snag. It has no water or dust rating, so keep sweat off it. The Koss Porta Pro is wired and also unprotected.
- Which sounds better?
- The Koss Porta Pro has the wider range at 15Hz-25kHz and higher sensitivity, and its semi-open design gives a more open sound. The Sony is closed-back and tuned for everyday listening. Many listeners prefer the Koss for pure sound, the Sony for convenience.
- Which lasts longer?
- The Sony lasts far longer per charge, up to 50 hours, and a 3-minute charge adds 1.5 hours. The Koss has no battery at all, so it never runs out as long as your device does. The Sony's battery will age over years of use.
- Is the Sony worth it over the Koss?
- At $25.00 at eBay as of November 5, 2026, the Sony costs less than the Koss at $39.99 at Amazon. You get Bluetooth, a mic, and long battery for less money. Pick the Koss only if you want wired, semi-open sound.
- Can I take calls on both?
- Only the Sony WH-CH520 has a built-in microphone for hands-free calls. The Koss Porta Pro has no mic, so calls go through your phone.
- Which fits larger ears better?
- The Koss Porta Pro is the safer choice for larger ears. Reviewers say the Sony WH-CH520 fits tight and suits smaller ears, and some find it uncomfortable over long sessions.
