Curtis, having had both types of surrounds (direct-radiating & Bi/Quad-poles), I really like the quadpolar QS-8 speakers from Axiom. I'm certain they are not a perfect timbre match to my classic 170's, but I cannot tell. You have me curious what a matched surround from Ascend will sound like. Would a pair of 200's actually improve the soundfield? Those QS-8's are impressive for rear effects, and have taken my system up a few notches. Even on multichannel music they sound great.
Whadaya think?
Ed
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* Audio by Van Alstine DVA-M225 Monoblock Amps
* MiniDSP 2x4HD For Sub calibration
*World's Best Cables Canare 4S11 speaker cables