NOT KNOWN FACTS ABOUT MICRO BARS

The QuietComfort Ultra is Bose's finest sounds cancelling headphones. It's a big up grade when compared to the common QuietComfort - even With regards to audio and sound cancelling performance - and is right up there with regards to high-quality when compared with other modern day heavyweights much like the Sony WH-1000XM5 along with the AirPods Ma