Hate to break it to you but true high fidelity earphones/headphones don't exist. The lower the frequency, the physically larger speaker required to reproduce it. For example, the massive soundwaves of a 20hz frequency-the lowest B on an 88 key piano-requires a 15" speaker. Earphones that seem to have good bass are tricking your brain, similar to the way a telephone does, into "hearing" what it knows is missing. Congratulations, you've been science'd.
Uh...yeah...they do, but thanks. I used to work as a studio engineer, so I understand the concepts surrounding speaker size and fidelity. ****, as a drummer, I can tell you that a piano has nothing on a 24" bass drum (even some 15" speakers be damned). That being said, all things are relative. Lots of studio engineers use high-quality headphones for mixing down, and many companies such as AKG, Sony, and Beyerdynamic (just to name a few) have produced headphones tailored specifically to this application for many, many years (decades, even).
Between these and a regular pair of studio monitors ("bookshelf" speakers), an engineer is able to get a pretty good mix that works across a fairly wide range of sound stages; the actual cone size of many speakers in most high end car audio systems, for example, are generally somewhere in between those of most studio monitors (~2" - ~8"). If you want to compare a $2,500+ component audio system with multiple woofer, mid, and tweeter speakers, in addition to a 12-15" sub, well...now you're comparing apples to oranges.
Perspective is also important. Many people think that listening to something in a car equipped with a very high-end, well-calibrated audio system (not one of those ghetto Best Buy installs, mind you) sounds "better" than listening to something through a pair of $250 studio headphones. I argue that these people only perceive it as "better" due to the particular environment -- the listener is surrounded by and enveloped in sound, lending to a perception of heightened immersion; however, put on a genuinely good, $200+ pair of headphones, and I guarantee that 99% of the time most listeners will hear things in any well-mixed recording they never heard before -- either in their car or sitting in front of their fancy component audio system.
So again, truly high-fidelity headphones do exist, and they've been around for a long, long time. You just need to keep things in perspective.
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