I would like to know which of the following details I should take into consideration when attempting to judge audio quality:
- Often comparisons of headphones only show the frequency range. However frequency range alone does not at all guarantee a good audio quality. I should always aim for about 20Hz to 20kHz correct? Is it worth to go for headphones which reach ever so slightly over 20kHz or below 20Hz?
- I have also heard of graphs showing the frequency response of a headphone. Can I ask for these at most stores?
- Also the impedance seems to be relevant, to judge whether a headphone needs an amplifier to work properly. But is there a good reason to choose for headphones which require amplification? Isn't low impedance always the best impedance?
- Some headphones offer noise cancelling. Is it only noise insulation or is it also an electronic component of a headphone which actively reduces noise?
- Do open headphones have a better audio quality than closed headphones?
- How relevant is the size of the driver?
- Does it matter what kind of magnet is used?
- And can wireless headphones compete with the audio quality of wired headphones?
- Maybe there are other relevant details I didn't list here.
I would like to be able to separate relevant information from commercial 'mumbo jumbo' next time I walk into a store. Of course good audio is in the ear of the beholder, but I would like to know how I can compare the specifications of headphones to make the search easier.
(This question is limited to quality of the audio, not the headset or headphones as a whole.)
So which of these specifications do I really need to know?
Let's assume I want the very best audio quality.