I have always interpreted it to mean that the attack on leading edges and transients is well defined, and there is an apparent lack of overhang or ringing after the note. It makes music exciting, but too much of it can be fatiguing.
Glider, the reason for my final sentence is because I believe some audio gear overemphasises attack to make demos more exciting and sell more. More accurate does not necessarily mean more attack.
There is also definitely some gear that lessens attack and softens everything .... some will prefer this presentation.
Porziob ... it's pretty easy to design a speaker cable with enough inductance to roll off higher frequencies. Too much capacitance and a wide bandwidth amp might start to oscillate.
Similarly it's pretty easy to design an interconnect with enough capacitance (usually the shielding) to cause rolloff where the source has a marginally high output impedance and the amplifier a marginally low input impedance. Not enough shielding and RFI becomes a problem.
The ability of an amplifier to control the speaker to deliver dynamic transients with little ringing or overhang is certainly not something all amps share ... hence the difference in sound.
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