The other day I noticed there was no sound from the right side of my Halo headset. I checked the audio system with a neighbors Bose and all was well there. After searching the archives here I discovered that a buildup of gunk in the ear tubes might be the problem. I checked mine out and sure enough there were liquid droplets and gunk in the tube. I started to order new tubes but thought this can be fixed or if I mess them up I'll be getting new ones anyway so why not try. After removing the tubes and earpieces I just took a can of brake parts cleaner and inserted the spray straw into the ear tube and gave it a squirt. The cleaner removed the liquid and gunk and after blowing the ear tube dry with my air gun I reinstalled everything. The end result is I now have a fully functional headset. Cheap and easy fix!!