For larger size ear canals

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 colour-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 16dB Noise Reduction Rating (NRR)

EP4 Sonic Defenders® Plus are triple-flanged 19dB Noise Reduction Rating (NRR)

also see Surefire EP3

1 x Pair,  size medium or large - £12.99 

• 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)
• 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

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