Hello and many thanks for the forum posts! I've been reading some time and I have received good help. Now it's time to say hi and ask one question. I would like to buy a set of open over the ears headphones to be used with Fiio X1 without amp I'm currently using it with shure se215, quite wide music range from classical to rock & metal (but also idm and others...) The 2 candidates are DT990 32ohm and the HD598. Sound leak is no problem at all, my main concern is how good can the x1 drive them. (I tried the HD598 and I was not very impressed but the conditions in the shop were not ideal) unfortunatelly AD900X or AD700X are not available here, and AKG K701/2 seem even more demanding on the drive and a price class higher here. Any idea or comment is welcome!