I run a pair of jl audio E112 subs in two systems (two channel and surround with pass through) and leave both connected all the time.
I even go one step farther and connect the high pass to my mains and using surround rout the 0.1 channels to the open line in on the subs and I have never had an issue of any kind and they say connected in auto on mode all the time. It works well. I can high pass two channel and for movies the subs are still high passed to the mains but also play the 0.1 channels.
I even go one step farther and connect the high pass to my mains and using surround rout the 0.1 channels to the open line in on the subs and I have never had an issue of any kind and they say connected in auto on mode all the time. It works well. I can high pass two channel and for movies the subs are still high passed to the mains but also play the 0.1 channels.