Computers & Networking

[Starflyer59]

It is most likely a interference with hardware inside the laptop. These types of speakers were really meant to be used on a desktop.

You know how you can connect headphones to a computer and you will hear all these little weird electronic noises. It's the same thing as that.

[shockwave88]

ah thanks is there any speakers are meant for laptops? well the interferences are annoying me so much lol

[Starflyer59]

Maybe just a small pair of powered speakers would do. You might still get noise though. Laptops were made to be mobile so they don't focus so much on isolating noise interference. There are noise isolators that you can buy. We use laptops at church for playing music and videos and slideshows and we use a noise isolator to cut out the noise over the sound system.

[Entropy]

The USB external sound cards should help in this regard.

In general, onboard motherboard audio (whether desktop or laptop) tends to have excessive noise.

Regarding USB vs. ExpressCard - for audio purposes (even 5.1), the bandwidth USB provides should be more than enough.  In fact, I wouldn't be surprised if that ExpressCard uses a USB interface internally (ExpressCard slots may use either PCI Express or USB for the actual electrical interface.)