Slammers, on 16 April 2012 - 11:41, said:
You don't need an amp, computer IS the amp.....
I'm confused by this entire thread... yes, some computers have a class T amplifier in them, but most sound cards generate enough power to only drive an amplifier or headphones. The amplifier is built into the speakers (somewhere, usually in the subwoofer if it has one). Otherwise, you're limited to those 3-5 watt laptop type speakers.
So, you're going to use an amplifier either way. The real question is, what happens to the signal on its way from it's digital origin to your ears. If you want a better amplifier, you can buy a home A/V one, but in reality depending on what you listen to (compressed music / movies) and your sound card (on the motherboard?), it probably won't sound any different.
The real advantage of home audio amplifiers is that they're usually bigger, and can drive speakers with more power as they have more room to vent, which means you get clearer sound at higher volumes. Also, you can get a huge upgrade in sound by getting a better subwoofer... usually PC ones are designed to go "boom boom boom" to make shotguns sound better in games... they're not often well mixed with the other speakers, which can make them overbearing in movies.