Hi, Looking for a pair of headphones with the biggest bass. I'll be using them for music with plenty of sub bass. I'm guessing closed will be better for this? The bass needs to be big but quality too. I'm open to the rest of the signature. Although i normally like open analytical sounds, i'm leaning towards a closed darker sound. As a point of reference, the HD650 would not have enough sub bass. They won't be used for long listening sessions, so the bigger the headache after one hour the better. Phil.