Are there any full sized headphones with more than 1 driver? I see a lot of IEMs with 2,3,4 drivers and it makes a vast improvement for the sound. So why not full size headphones too? If anyone can enlighten me or knows of a headphone  thanks for the info! 

My HD 595s foam padding came apart because of the humidity and long-term use (i have had these for for over 8 years) is there any way i can repair it without getting them professionally fixed? I contacted sennheiser but their quote was too expensive for me.