Is 40mm the new 50mm? - Precision Camera and Video
Amazon.com: OneOdio Wired Over Ear Headphones Studio Monitor & Mixing DJ Stereo Headsets with 50mm Neodymium Drivers and 1/4 to 3.5mm Jack for AMP Computer Recording Podcast Keyboard Guitar Laptop - Black :
What is the difference between 40mm and 50mm drivers? : r/headphones
5 Reasons the 40mm is Better Than the 50mm - Rose Clearfield
35mm vs 50mm Lens Choice: Which is Right for You? - 42 West, the Adorama Learning Center