Creating a surround sound system
Hi and welcome to FixYa,
Offhand should work more than OK. Even if the 520 is only pushing 75watts per channel, you have 2 X for the front KSB-2.1 (left & right) plus another 75 for the Polk Audio center in addition to 250watts built-in amp of the Velodyne CT-150. What would be better is another pair of KSB-2.1 or comparable for the surround (another 2 X 75 and widening the separation).
Good luck and Thank you for using FixYa. Happy Holidays.
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