990’s and 598’s are both open back so they are not really comparable to M50’s. M50’s are great though, a lot of people in my office use them. Though you did piq

990’s and 598’s are both open back so they are not really comparable to M50’s. M50’s are great though, a lot of people in my office use them. Though you did pique my interest with the 990’s since I have a pair of 598’s I use at home and I love them, so would be interested to check the 990’s out.