Curtis is correct.....it is a matter of personal preference.
I read somewhere that the sound mixers(Engineers) use multi/bi/di-poles, but what do I know!
I have QS-8's with my 170's, and they sound fantastic! Much better for movies than my old direct-radiating two-ways they replaced. I don't do much MC music so I cannot comment there. YMMV.
Ed
* Sierra-2EX's W/V2 crossover upgrade
* (2) Rythmik F12's
* Parasound Halo P6
* Audio by Van Alstine DVA-M225 Monoblock Amps
* MiniDSP 2x4HD For Sub calibration
*World's Best Cables Canare 4S11 speaker cables