Will sell the amp separate from the headphones but only if the amp sells first. The amp is in 9/10 condition, black and no issues. The cans are the same. I have the boxes for both. The BHSE has the RK50 upgrade, stock tubes and metal feet. I believe retail is $6800.
BHSE - $6,000.00 plus shipping.
O2 mk1 - $1,350.00 plus shipping.
Combo - $7,250.00 plus shipping.