Surefire Sonic Ear Defenders EP3 and EP4, LAS-EP3-**, LAS-EP4-**

 

 

		EP3 £12.99   select size Medium MPRLarge LPR
		Box of 25 x EP3 medium £287.50
		EP4 £14.99 select size Medium MPRLarge LPR

EP3 Sonic Defenders and EP4 Sonic Defenders Plus protect your hearing, without interfering with your ability to hear routine sounds and conversation. Safe sound levels are allowed to pass through while potentially harmful noises (above 80dB) are reduced via a proprietary design that incorporates the patented Hocks Noise Braker filter. When even more hearing protection is required without the need to hear routine sounds or conversations Sound Defenders' attached stoppers can be inserted. The right/left color-coded Sonic Defenders are made from a soft, hypoallergenic polymer and ergonomically shaped, with a multi-flanged stem, providing a comfortable all-day fit. And their low-profile design means they can be worn while wearing a helmet or mask or while using a phone or headset.

EP3 Sonic Defenders are double-flanged for a proper fit for most people.

EP4 Sonic Defenders Plus are triple-flanged for those with larger ear canals.

Both types of Sonic Defenders are sold in single left/right sets or in a box containing 25 sets. EP3's (double-flanged) come in S, M, and L while EP4's (triple-flanged) can be ordered in M and L sizes.

 

FEATURES

16dB Noise Reduction Rating (NRR) for EP3 Sonic Defenders with stoppers in
19dB Noise Reduction Rating (NRR) for EP4 Sonic Defenders Plus with stoppers in
Lowers potentially dangerous noise levels above 80dB
Hear safe sound levels as if you weren't wearing ear plugs
Ergonomic design and multi-flanged stem conforms to ear shape for comfort and earpiece retention (EP3's double-flanged; EP4 triple-flanged for larger ear canals)
Made from soft, hypoallergenic, medical-grade polymer
Low profile design allows you to keep them in place while wearing a mask, helmet, hat, or while using phone, headphones or supplemental hearing muffs

 

 

The Hocks Noise Braker filter is used in EarPro's Sonic Defenders. This filter uses the laws of physics specifically, the Accelerated Resonant Decay Principle, which states that we can neither create nor destroy energy, only convert it to convert sonic energy into thermal energy. The filter accomplishes this conversion through compression acceleration, as illustrated in the diagram below.
Any rise in temperature is so minute it cannot be noticed by the wearer. No sounds over 80 dB will pass through the filter. *1 When worn for hearing protection, the filter reduces the sound as follows:

Input Level         Noise Braker Attenuation
 70 dB                              4 dB
 80 dB                             26 dB
 90 dB                             34 dB
100 dB                            32 dB
110 dB                            36 dB
120 dB                            39 dB

*all values are C-scale values

 

*2  Significant attenuation starts at 80 dB at a value of 26 dB, rising to 34 dB at 90 dB inputs but remaining roughly constant at an average of 35 dB through sound levels of 120 dB. *3 For example, if the level of the noise is 110 dB, the noise braker will attenuate the sound to 74 dB, well below the mandated action level of 85 dB.

CONCLUSION:

Hocks Noise Braker filters will reduce the level of sound coming into the ear in conjunction with properly fitted earpieces, allowing no sounds over 80 dB to pass through.

*1 Hock's study

*2 C-scale is an all encompassing scale, taking into account almost all frequencies covering more of the real life noise.

*3 Jack Vernon, Ph.D., University of Oregon, Health Sciences Center