I purchased these online thinking they were the Momentum over-ears that I'd previously demoed. They are not, nor are they comparable in any way. Much lower build quality, and the sound is not even remotely similar. Where the Momentum over-ears are relatively well balanced for closed ear phones and sound clean, these are boomy in the bass and completely unbalanced, leaving just warm mush in the mid. Classical music, while clearly not the intended type of recording for these, sounds absolutely terrible. My years old, maybe 10 years old Sennheiser...