I have a Harman Kardon AVR225 with 4 JBL LXE330 speakers. Currently they are in parallel on the front channels of the receiver. I also have a JBL PSW1000 sub. Right now, They are configured in a 2.1 setup, but I want surround sound so I am looking for a 5.1 path. These speakers are almost 10 years old, so I'm not sure which center channel could I get that would tonally match these speakers. Or would I just be better off getting 5 new matched speakers?