wrote in message
...

On a related point, these "Headfiers" plug in the headphone output on
their mp3 players into these little amps to power their headphones.
What is the point of that? Surely you can't improve on the signal
coming out of the headphone socket? I know bugger all about
electronics but it seems that the most this would achieve is literally
just amplify the signal, by which I mean, just make it louder?

If the headphones you were using were difficult to drive (say less than the
standard 32ohm impedance), then there might be an improvement in sound
quality by relieving the mp3 player's headphone amp of the load, and
transferring it to an external amp.

But please note the word "if".

David.