So I have two soundbars with wireless subwoofers and just picked up a pair of KEF LS50 Wireless 2. I have the KEFs in a small room at my girlfriends apartment and wanted to try them with a sub. Are soundbars external subs now designed to be unusable as is? Seems like such a waste. I did think of a way it could work and may try it out later today, to use an inexpensive analog to optical converter and then use the LFE out of the KEFs to the optical in of the sound bar. Any thoughts?