XCOR PRO at Indoor RangesUpdated 3 months ago
The AXIL XCOR PRO is designed to reduce damaging noises, not suppress them. They are compression units. These units allow you to hear loud noises, but with the proper seal, the loud noises will be filtered down to be tolerable. Some people with sensitive hearing may want to double up indoors. It also depends on the caliber you are shooting. Since the XCOR PRO provides 29 dBs of passive hearing protection, AXIL recommends doubling up in the indoor range to test your comfort level. Then when you are confident that you have a correct seal, move forward as you feel best.
While many use the units without doubling up, it is a matter of preference. Do what is best for your hearing, comfort, and safety.