The XCOR offers 29 dB SNR of passive hearing protection when using foam tips. This level of hearing protection is dependent on the fit of tips. If you were listening to music, passive protection would be constant. The electronic compression would be engaged if you were also using the hearing enhancement. This function is entirely separate from Bluetooth, so all sounds over 85 dB will be compressed for your hearing safety.
The AXIL XCOR provides 29 db SNR passive hearing protection when the foam tips seal off the ear canal correctly. That is the dampening you will hear when you shoot. If you engage the electronic compression filter, it will also compress all sounds over 85 db. This is different from noise cancellation. AXIL products compress noises because they are designed for situational awareness.
AXIL XCOR PRO offers 29 DBS of passive hearing protection from the foam tips, which is constant when seated correctly. Then, when you shoot, if you have the compression filter on, as the sound passes through, it will be compressed to 85 DBS. They are designed for situational awareness. So you can hear and still have your hearing protected.