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Logitech are good and cheap.

I'm using these. Really compact,not brilliant but for a size and price packs a good punch. Also price is way lower in real life than they state on logitech website...for some reason.

http://www.logitech.com/en-roeu/product/speaker-system-z313

Do you play multiplayer games with friends? Get a headset if so.

I use these, and have been very happy with the quality provided.

https://www.amazon.com/AmazonBasics-Powered-Computer-Speakers-A100/dp/B00GHY5F3K/ref=sr_1_1?ie=UTF8&qid=1471787160&sr=8-1&keywords=amazon+speakers

I can't tell you what to buy, as I rarely use speakers, but I can tell you to not buy "Trust SP-2370". The sound in those was terrible, you could hardly hear what people said in movies & TV-shows without turning the volume up a lot.

You might be interested in this video.

Good:

Creative Inspire T12 2.0 Multimedia Speaker System with Bass Flex Technology
https://www.amazon.com/Creative-Inspire-T12-Multimedia-Technology/dp/B0028N6YH0/

Better:

Creative GigaWorks T20 Series II 2.0 Multimedia Speaker System with BasXPort Technology
https://www.amazon.com/Creative-GigaWorks-Multimedia-BasXPort-Technology/dp/B001RNOHDU/

Best:

Creative GigaWorks T40 Series II 2.0 Multimedia Speaker System with BasXPort Technology
https://www.amazon.com/Creative-GigaWorks-Multimedia-BasXPort-Technology/dp/B001S14DYO/

Logitech is great for speakers, I love them

thought about a soundbar too? depends on what you want to invest, but if you're looking for small speakers anyway, this maybe would be an idea, as long as you don't need excellent stereo sounds for games. you can connect them wireless and with cabel and you can take them with you.

Whats low for you? how much free space ? for what just surfing a few videos on youtube, gaming, movies, music ? more infos :p

https://www.amazon.com/Edifier-R1700BT-Bluetooth-Bookshelf-Speakers/dp/B016PATXSI
or Microlab SOLO 15
or Wavemaster Cube

and dont buy something form logitech ....
and dont buy 2.1 or 5.1 under ~400€/$ and even these arent really "good"

sound has its price, if u dont really care buy anything you like in ur price range