They may very well work fine for you.
Sure, multiple channel receivers are meant for surround sound setups, so yes, the intended use of the channels involves various speakers being assigned specific tasks.
In surround sound, the center channel is most important. It is intended to anchor dialog close by the screen. It typically may be being assigned 65%-70% of the audio energy info. Thusly, the front L&R speakers, are substantially downgraded in importance compared to classic two channel stereo.
SIde & possibly, rear speakers often coast, but get that important, sudden surge of sound to reinforce the feeling of surround effects. I must also make mention that a good surround system will make important use of a capable subwoofer to provide the instantaneous slam effect of sudden peaks. Sub woofers are best selected from dedicate makers of sub woofers. That would be a prudent addition to the set of Klipsch you do have.
I have six Klipsch stereo floor speakers that are at least 15 years old. I'm hoping to use them for a surround sound setup but don't really know if that is possible. I know at the least I need a new A/V receiver. Are these speakers viable for a surround setup or is their something extra special about separate subwoofers, center and left/right speakers? My TV is 52" Sharp Aquos HDTV and i use DISH Network.