> Show me earplugs that REDUCE equally across all frequencies and I’ll invest every dollar I have to my name. It has been a long time since I worked tangential

> Show me earplugs that REDUCE equally across all frequencies and I’ll invest every dollar I have to my name. It has been a long time since I worked tangentially with frequencies, but IIRC it physically isn't possible to block/dampen all frequencies of sound. Although due to different physical phenomena, this is why everything has a color and nothing is truly black - it is impossible for a material to suck in every wavelength of light.