hey guys, can any speakers, like regular bookshelf's be used as surround sound speakers? or do they have to be speakers that are called surround sound speakers?
Yes you can, I would just make sure the impedance(ohm) ratings match,If your receiver is rated for 8 ohm speakers then try to use 8 ohm speakers.
Of course real life ohm performance will vary with volume, frequency and general ohm rating discrepency(i.e. speakers rated at 8 ohms will fluctuate with volume and frequency,generally anywhere from 2 to 16 ohms, Speaker manufacturer will also vary), Blah Blah Blah, no big deal.
Just try to match the ohm ratings and you will be fine.