The XCOR is rated for 29 dB SNR /23 dB NRR with the passive foam tips. When the electronic protection is engaged, all sounds over 85 dB will be compressed for your hearing safety. The passive and the electronic are designed to let you hear what is happening while protecting your hearing.
AXIL XCOR PRO offers 29 DB SNR of passive hearing protection. The tips dampen the sound. When you activate the hearing enhancement, it also activates the compression filter, so all sounds over 85 DBS will be compressed. This is different from noise cancellation. The XCOR PRO is designed for situational awareness. So you will still hear the sound but have your hearing protected.