Sennheiser PXC 550 is one of the top active noise cancelling headphones from Sennheiser. Built for travel, they are lightweight and compact when folded. Smartphone app allows you to customise the noise cancelling level
The ANC is not as aggressive as Bose QC35 and Sony MDR-1000X. The low humming ambient sounds and conversations are filtered out, but the high frequencies remain audible, achieving an equivalent of passive noise cancelling at these high frequencies.
The headphones do not have a power button. When folded, the headphones power off automatically, so this is extremely convenient. ANC is adjustable, and audio quality is one of the best among the ANC. The treble is bright and airy, with sizzling sibilance that electrifies the vocals and acoustic instruments. The bass is neutral, not exaggerated. The sound staging is wide, which means I had to turn up the volume more to hear better.