The Bluetooth headphone test provides results for 240 headphones with and without earpieces. Which ones sound strong, have good batteries and no harmful substances. New in Stiftung Warentest's headphone comparison: 26 current in-ear and boom headphones. Among them are models from Apple, JBL, Samsung and Sennheiser...

With its open, unadulterated sound and largely problem-free Bluetooth, the M50xBT2 is drumming along at the front of the 300-euro class, as long as you do without ANC, USB operation and aptX.