If you’re looking for a pair of ANC headphones and if sound is very important to you, then I feel either the Bowers And Wilkins PX7 S3 and the Sennheiser HDB 630 are great options to consider. Now the PX7 S3’s have amazing build quality and design… where as with the HDB 630, these are a little different from the Momentum 4’s but not by much. But toady we’re going to compare these two headphones and lets see which ones are right for you.