This is a medium grade RCA cable from TSpec. This cable is a 17ft 4ch RCA cable that would be great to power a 4ch amp for four speakers. You can also run a 4ch amp to your fronts and bridge the rear channels for a subwoofer using this pair of RCAs.
 
Dual twist for improved noise rejection
Ultra flexible PVC blended jacket
Patented high tolerance compact machined metal end
Quad split tip for maximum contact area
Packaged in high-end retail box