Maybe you should set up a pair of big f**k off speakers at either side of your desk, this has many advantages, 1) You'll never have the problem of only one ear working 2) You can let everyone in the office listen to what you want to 3) When you boss is on your case, you can slowly turn it up while staring them in the eye, until you can't hear them, result Sack it, lets go bass bins, mids and tops, the works