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I've been thinking about modding my HD429. Well, I am kinda adventurous with these headphone, this my first over ear headphone, and since I trying to mod the bass and the ear-cups (just like to try how it sounds) also I am curious what would it be if I modified it into an open ear type? You can actually remove the rubber material which marked with the Sennheiser's logo (I see clips that hold it inside) and I might found an empty polycarbonate plate which protecting the transducer I see, so I just think if I remove it (which is potentially violent things to do with this thing, and might not be undo-able) will it made a great impact in the soundstage performance? How do you think? Please reply your opinion :)