A:Answer You have an interesting question right there. Our Club 5501 does not have an Auto Sense feature. As explained in the manual, if you're using a line level input, the INPUT switch must be set to LO and you must have a remote power line connected to the remote power terminal. If you are using a speaker level input, you must have the INPUT switch set to HI1 or HI2, and nothing should be connected to remote power terminal.
If you're still have issues, please submit a case request at https://www.jbl.com/support-contact.html and the Customer Service Team will be more than happy to assist you.