What is a 'fast' amp?


Not asking about specific amps, rather what does a 'fast' amp sound like vs a 'slow' one? This terminology is thrown about a lot and I don't know how to tell the difference.

I got to thinking... is an amp fast when it doesn't rush the music (ie, it is faster than the music, so the music appears relaxed) or does it rush the music, making it sound fast? I peronally would think that neither is too good, but I would take the relaxed over the rushed sound, of course.

?? Perplexed.
kck

Showing 1 response by krell_man

If you want to hear what's on you album or CD, would you rather hear as closely as possible what's actually recorded or something smoothed over?

Think of it this way. An amp is taking in what's coming to it, amplifying it and passing it along to the speakers. The faster a good amp reacts, the more realistic your presentation.

It's called the amp's Slew Rate. If you've heard about Class 'A' amps, this is their bread and butter. If an amp is running wide open all of the time, it can react much quickerto the input.

The problem for the user is that the amp is drawing a lot more current from your wall outlet because it's running at full power all of the time. It's also why the amps run warm to hot.

Krell has tried to make this more efficient. You can look into Class 'A' and Class 'AB' amps more if you want to.