At least in my personal experience, my HE400i sounded better when they hit around 100 hours of use. I reset the timer on foobar so when I compared my HE400i with my friends out of the box HE400i y could celarly hear the difference. The difference I could noticed was in the low frequencies...

As long is only a week. I hope they release the update! Saludos Enviado desde mi Nexus 6 mediante Tapatalk