I am just building on what Peter @ JAYS already stated.
Quote:
|
What does impedance mean? The more or the less better?
|
Quick Take: Doesn't matter to the user.
Full Take: Theoretically the higher impedance, the less electrical noise. However this isn't the same as noise such as white noise or hiss but electrical noise can add to white noise or hiss. Almost all Headphone/Earphones have the same impedance rating. If you half you impedense you technically get double the power (minus losses) but the amplifiers in mp3 players don't like doing that and nor do I suggest it.
Quote:
|
What does sensitivity mean? The more or the less better?
|
Quick Take: More sensitive is better.
Full Take: If your earphones/headphones are more sensitive they are more efficient as using the power supplied by your amplifier.
Quote:
|
What does frequency response mean? The more or the less better?
|
Quick Take: More is better but depends on you music source.
Full Take: Most people hear from 30hz to 18000hz depending on the person. Some can here above 20000hz and others not past 16000hz. All songs from CDs are 20Hz to 22000hz. Mp3's/Other formats when they compress the song a lower bitrate determines the highest freq's including. 1 128bit MP3 cuts off the songs freq at I believe 16Khz (16000hz) so they throw away all data above that freq making the file smaller. People can't hear below 30hz because its Sub Harmonic frequency's. At that freq you can feel bass (Sub whoofer) but you can't hear it. Chances are your headphones will easily play the 20hz - 22khz no problem. Its the question of will you music have it?
Quote:
|
What does driver unit mean? The more or the less better?
|
Quick Take: More Drivers are better.
Full Take: A driver is the name for speaker. A speakers uses alternative current to create a magnetic field. There is a cone in the centre with a coil (known as the voice coil) that pushes and pulls the speaker depending on the direction of the current. This creates sound. More drivers are better because they usually dedicate one driver to higher freq's and another to lower freq's so they don't have to work so hard. In earphones you usually don't see this until some nice highend ones. ~$200 USD. Headphones you can find starting around $100.
Quote:
|
Also, different types of plugs and cord type? Which ones are good and which ones are bad?
|
Quick Take: The bigger the better usually but you don't need to worry about it.
Full Take: There is basically only 1/4 inch jack for mp3 players. Some phones that play mp3's may use 1/8inch. Its easier to send more power with less resistance (losses) with a bigger conducter. However with the small amount of power that mp3 players have, the losses between the two would be negligable.
I hope this helps. I am in Electrical Engineering if your wondering how I know this. Also I love audio equipment. Hope this helps!!