I have an RCA 5.1 surround sound system, but the receiver was on its way out so I replaced it with a Pioneer VSX-531 5.1 Receiver (https://www.amazon.com/gp/product/B01G5XKNKW/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1), and decided to use the old speakers because they sounded great when the...