The GRS 15PR-8 speaker is the best choice you can make if you need to replace a worn out, blown 15" woofer.
GRS 10PF-8 10" paper cone woofers are ideal replacement speakers for use in sealed-box loudspeaker systems in almost any application.
SubCasts allow you to make up to two subwoofers wireless. No programming, no assigning IP addresses, just plug Sub "out" into SubCast transmitter and power it up, then plug receiver module into subwoofer inputs and power it up. Subwoofers can now be placed anywhere in the room.