Especially with the K 701 it's not just about driver break-in, but also earpads wear-in, which makes a considerable difference. So letting it play somewhere in a drawer is only half the process. This for I recommend bass-heavy music and loud levels if you really want to benefit from an accelerated break-in. Otherwise you could just break it in by listening to it. – It doesn't matter if you repeat one song or shuffle through a playlist.