LeadPoison said:
My Kubota is a 5 cylinder.
It isn't loud enough to have had made me think about wearing ear protection.
Since it is the cumultive effects of exposure to noise that causes hearing damage, you may want to reconsider wearing hearing protection. Both my grandfather and my father have significant hearing losses. My grandfather worked for the railroad, and was constantly exposed to noise in that environment. My father was a music minister, and taught choral music. You wouldn't think of that as a particularly "noisy" environment, but he's paying the cost now anyway.
Many of us (like my father) think of the sound of our tractors as "music to our ears" and it's easy to forget the long-term effects of exposure. Having watched two generations struggle with hearing loss, I'm going to do everything I can to avoid it, myself.
Noise-attenuating (sound deadening) hearing protectors are available from lots of sources. The best ones for tractor use may be the ones they sell for use at gun ranges. They are designed to reduce the noise level of "percussive" sounds (gunshots) that are similar in nature to the sound waves generated by the exhaust system. In the process, they do a pretty good job of dealing with "whining" or "whirring" noises, such as the sounds often made by the transmissions, PTOs, and HSTs of tractors. The "el cheapo" hearing protectors you can buy at the hardware store are generally worth what you pay for them.
Active noise reduction (noise cancelling) headphones are available from several sources, including Sony, Ear Hugger, Senheiser, Bose and (strangely enough) John Deere. On the high end, these usually include some form of noise attenuation as well as the ANR circuitry, cost upwards of $200, and are well worth the expense if you don't have a cab on your tractor. (From what I've seen and read, if you have a factory cab, you probably can get by without 'em.) The ones that completely enclose the ear are more comfortable if you are going to wear them for a long time. The less expensive ANR headsets (John Deere, Sony and Ear Hugger) are a lot less expensive, generally fit up against your ear (which gets old after a few hours), and cost less than $100. My Ear Huggers were purchased online for less than $40 at
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I have personally found that a 4-hour stint with the ANR headset is far less tiring than a 4-hour stint without them, especially in the Texas heat (it's often 100+ degrees when I'm finishing up). (My wife likes it as well -- when I'm done, I can be talked into going out for the evening, versus sitting around watching TV 'cause I'm feeling tired.)
If you don't want to spend that much, there are "disposable" foam ear plugs available at almost any hardware store, auto parts store, etc. that do a very good job of reducing the harmful effects of loud noises. To me, these are far and away the most comfortable ear plugs on the market. They cost less than a $1 (considerably less, if you buy in bulk), and can be worn several times before needing to be cleaned. (OK - so maybe I'm a cheapskake, but I learned in the Army that if I just left these earplugs in my zipped-up pockets, they would run through the wash with my flight suit and come out looking and feeling like new. I must have reused the same pair for 3-6 months at a time!)