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Sound from loudspeakers is acoustically contoured by the listener's head and outer ears before reaching the eardrums. This interaction provides spatial cues (in the form of crossfeed and phase and amplitude shifts) which are important for perception of 3D sound. These spatial cues are called head-related transfer functions (HRTFs). Because headphones sit on top of the ears, the sound goes directly to the ear drums without any HRTF transformation. Lacking spatial cues, the brain images the sound field inside the listener's head in a straight line between the ears. There are headphone designs and electronic processors that can make headphone listening more realistic.
State-of-the-art computer games have spectacular 3D sound effects. When evaluating headphones for PC games, the best approach to is to take a game demo disk or a recording of some samples of the 3D game sounds to the audio store to audition with headphones. The ability to convey the directionality of stationary and moving sound sources (front, back, up, down, left, right) is important in gaming headphones. In general, headphones that present a good sense of acoustic space with music will also perform well with games. If the headphones will only be used for gaming, some gamers will select headphones that sound especially good with sound effects (for example, a very strong bass response), although they might not be as suitable for general listening.
Modern dynamic headphones are very efficient (over 90dB SPL per milliWatt) and will reach full volume with just a few milliWatts of input. Headphone amplifiers are typically rated between 10mW and 100mW.