A:AnswerThe "jbl partybox speaker 710" would need to have a RCA subwoofer output to be able to connect to the R-121SW. Please first check to see if the "jbl partybox speaker 710" has a dedicated subwoofer output.
A:AnswerI am sorry to say but Klipsch does not offer a wireless adapter/transmitter for the R-121SW. You could consider a RCA wireless transmitter and receiver to achieve this. Please check with your local electronics retailer for this!