Surefire Sonic Ear Defenders EP6 Signature Series, ideal for Motorsport

 

 

EP6 £15.99   select size Medium MPRLarge LPR

 

Description

EP6 Signature Series were designed to meet the demanding needs—and style demands of motor racing enthusiasts. That's why they're endorsed by drag-racing guru Rich Christensen. EP6s help protect the hearing of racing fans, pit crews, and anyone else exposed to the potentially dangerous noise levels of auto racing, which can exceed 140 dB (about the same loudness as a gunshot) and can permanently damage hearing, especially with continued exposure.

 

Their unique design blocks potentially harmful sound levels while allowing safe levels to still be heard, so you can talk with those around you. Patented Hocks Noise Braker filters prevent potentially harmful noises above 85 dB (like the scream of a high-performance engine) from entering into your ear canal, while safe sound levels below 85 dB are allowed to pass through and be heard. And to block lower-level sounds and noise in quieter situations, such as in an airplane or while sleeping, the attached stoppers can be inserted for a Noise Reduction Rating (NRR) of 24 dB.

Multi-flanged, right/left color-coded EP6s are made from a soft, hypoallergenic polymer and ergonomically shaped to lock into your ear, providing all-day comfort and a secure fit. And their low-profile design means they can be worn under a helmet or hat—even while using a phone. Available in racing black (for flesh-colored alternatives, see EP3 Sonic Defenders or for those with larger ear canals, see EP4 Sonic Defenders Plus).

EP6 Signature Series are sold in a single left/right set. Each set is packaged in a convenient carrying case. They come in medium (M), and large (L). Medium-sized EP6s fit most people.

 

FEATURES

 

• 24dB Noise Reduction Rating (NRR) with stoppers inserted
• Lowers potentially dangerous noise levels above 85 dB (like the roar of a racing engine, which can exceed 130 dB)
• Hear safe sound levels (with stoppers out) as if you weren't wearing ear plugs
• Ergonomic design and multi-flanged stem conforms to ear shape for maximum comfort and retention
• Made from soft, hypoallergenic, medical-grade polymer
• Low profile design allows you to keep them in place while wearing a helmet, hat, or while using phone
• Attractive racing-black color
• Endorsed by Rich Christensen

 

 

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