I have have a JBL GTO755.6 amp that I currently have connected to a pioneer deck through the pre-outs. I just installed a bluetooth hands free device in my car and would like to connect it to the amp as well. The amp has high level inputs that are not in use right now so I would like to use those for the hands free. Will I damage anything if I have both low and high level inputs in use and connected to different sources at the same time? Is there anything I should be aware of before I try this?

Thank you in advance.