Easy. These guys are the pro's.
https://www.etymotic.com/er4-new.html
You can not control the frequency response without isolating the ear canal. These are the only plugs that do that effectively. They also have a 31 dB noise isolation factor, better than any head phones. Most people use these as their only headphones. No weight on your head. No sweating under the seals. They are also tough as h-ll. There are kevlar strands in the wires. You can hang yourself and you won't hurt them. If your wife accidentally throws them in the blender with your strawberry daiquiri they will send you a new pair at 1/2 price. Great Company!
You can not control the frequency response without isolating the ear canal. These are the only plugs that do that effectively. They also have a 31 dB noise isolation factor, better than any head phones. Most people use these as their only headphones. No weight on your head. No sweating under the seals. They are also tough as h-ll. There are kevlar strands in the wires. You can hang yourself and you won't hurt them. If your wife accidentally throws them in the blender with your strawberry daiquiri they will send you a new pair at 1/2 price. Great Company!