Along with the others, earplugs (soft foam, 30 cents at the local hardware store /forums/images/graemlins/smile.gif ) are what i use, along with an occasional set of muffs. ive learned to carry earplugs in my car, in stick bags for drums, to my dorm, and the ear muffs on the tractor.
they say that most farmers have more hearing loss in their left ears. this is caused by years of turning to the right to look at equipment (think about it, most ag equipment is hitched to the right of the tractor, if not centered behind. tho one exception would be plows), this leaves the left ear exposed to the engine noise all of the time. i guess with CUTs, it wouldnt be as much of a problem, as most of the attachments are 3ph, and centered right behind. even so, i still turn to the right, just a habit that ive picked up i guess.