I have an ONKYO TX-SR606 THAT i AM CONNECTING TO MY NEW 65 " SAMSUNG TV AND WANT TO USE "PORTABLE/NON WIRED" SPEAKERS as THE REAR SURROUND . Have complete Bose (5.1) system wired / in place and the Onkyo is capable of 7.1 but never wired for Surround back left and right. ( originally had a Yamaha 5.1) What speakers would be acceptable/work with my sound system IE wireless/bluetooth/??? Powered or battery (with power charger) would work as I have electrical output avail where the Back speakers would go.