No. Earphones are not mandatory at a Nascar race.
"The higher quality noise cancelling earphones can be expensive. Products from Bose can be $300 or more, as are the earphones from Dr Dre. Other brands can be found for under $100."
There are many online shops out there where one can buy great and affordable noise cancelling earphones. Some examples of shops and sites include "Amazon", "Panasonic Online Shop", "Worldshop" or at the online store of "Sony".
"Noise cancelling earphones vary in price. If you buy them used you could get them between 75 and 100 dollars. You can buy the new at electronic stores for around 200 dollars. You can also purchase them on websites for around 250 dollars, but might have to pay shipping as well."
Allot of brands offer earphones with noise canceling features, some active, some passive but brands like Bose, AKG, Harman Kardon and PSB offer some of the best in both.
There are many types of headphones that are manufactured by Bose. Bose manufactures over the head noise cancelling headphones as well as earphones and headsets.
You can buy Sony noise canceling earphones/earbuds on Amazon, SlankIT, and Best Buy. You are sure to get the best deals on these sites.
Bose does offer noise cancelling headphones. You can try them out in a nearby store and will be impressed by their noise cancelling ability. They are high quality products.
Companies like Sony offer the best earphones. You can get these on Amazon, SlankIT or Best Buy.
The best noise cancelling headsets are the Bose Quietcomfort 3, since it offers excellent noise cancelling without runing the sound quality.
Noise cancelling headsets block out ordinary noises in the background that can be disruptive to conversations. Noise cancelling headsets are useful for home office workers to block out household noises when telecommuting to work.
The best reviews of noise reduction headphones on CNET is the PSB M4U 2. These headphones are good in that they have comfortable ear pads, a long lasting battery, and produce great sound. The only bad thing about them according to CNET is that they are more expensive compared to similar products.
Any unwanted noise is muted with the noise cancelling headphones. For example if there is a baby on the plane that is crying. The headphones will mix the noise from your music/media and the external noise and cancels out the external noises.