bellabennet :
Is it the same as an amplifier? I was planning to buy an amplifier. But Im not sure what it does
Yes, AV Receivers have an amp built-in to connect them all up. Good intro to AV receivers
here
Looking at the specs, they are 6-ohm speakers so just have to double check the receiver can handle the 6-ohm impedance (most can without problem). One model that keeps coming up when I search, the
Onkyo TX-SR373 really good deal at $200.
To make it 5.1 just get a 6-ohm center channel like this
Sony SSCS8 and maybe a decent powered sub like the
Polk Audio PSW10 that would compete your budget surround setup!