The different types of designs incorporated into the shooting range headphones are derived from the ANSI-S-3.19 standards within the North American zone. The protection device can be active or passive in nature. The attenuation levels achieved are measured on the basis of two types of protection. The first type is the coverage offered to the external ear and the ear canal. The second type of protection is to seal off the rear ear region where the sound sensitive bone is located. This is called as Auditory Ossicle. In fact it is made of three small sized bones which transmit sounds to the inner parts of the ear.
Real Ear Protection for Shooting Range Headphones
The method of providing real ear protection with shooting ear headphones can be achieved by fine tuning its design properties. The designers apply the principles specified in ANSI S-3.19 standards dealing with attenuation methods.
- Attenuation is a method for reducing the intensity of noise arriving at the target. In this case you can assume it as the protection device. The components of the protection device either deflect the noise away or absorb the waves and dampen their intensity. The first task is achieved by the design of the ear cups. The second task is achieved by the design of inserts, foam pad and the foam cushion in the interiors of the cups. Real Ear Attenuation is achieved by sealing the rear ear bone to it airtight. The waves of noise don’t impact on the ear bone. Hence the inner ear is protected from the shock waves despite the user being in high intensity zone.
- The ear cup material needs to be tough and it should have higher tensile strength. This can be achieved by using engineering grade plastic like ABS, polycarbonate or other equivalent material. The process of molding plays an important role in enhancing the density per square centimeter. The cycle time of cooling hardens the material without making it brittle. That means the ear cups can withstand high intensity shock waves without cracking down in the long run. They can also be used in areas like sports shooting, where the time interval between two gunshots will be less than one minute. By fine tuning the properties of the ear cups it is possible to enhance the endurance range to higher levels.
- The inserts and foam pads are used to seal the gaps which may exist between the head and the edges of the ear cups. They can also make the inner areas air tight. When the user wears the shooting range headphones in the specified method, there is vacuum created within the inner space of the ear cusps. Since most of the shock waves intensity gets dampened within the inserts, foam pad and the cushion layers, the sound which passes through the ear canal is within the audible range.
ClearArmor 141001 Shooters Hearing Protection Safety Ear Muffs can reduce the intensity of impulsive noise above 164dB by more than 84% in all types of environment conditions. Hence they are rated to have all the characteristics of professional level shooting range headphone.