More Protection
I am not an audiologist, but as I understand ANR all they do is "mask" the sounds so that you no longer hear them. I would suggest that if you are looking to protect your hearing, ANR alone will not do that. You might want to look at adding the Oregon Aero hush kit to your headset. You need passive noise reduction as well as active noise reduction. I have been flying with an older DC set modified by that outfit in Amarillo for ANR and then added the "Hush Kit" from Oregon Aero and if my batt's fail, I hardly notice. Oregon Aero's passive is awesome!