Politics sometimes plays a bigger role in technology than the technology itself. Few technologies have a greater political risk than eavesdropping.
For decades US technologists have been asked to bow to political "needs" for assured ability to intercept signals of all types including voice calls.
Regadless of your personal views, the latest controversy over the legality of broadscale voice intercept may be the final nail that gives US technologists the public's go ahead to create unbreakable encryption.
Finding out the perceived frequency response of your combined headphone/ear 'system' and compensating for it using parametric equalization can offer some eye-opening benefits. But finding an EQ solution isn't always easy.