Question 2 sources to 1 subwoofer with only LFE in?

Feb 23, 2021
The sub has just an LFE and I want to connect my AV amp plus an "all in one" blu-ray home theatre system. I've read a Y splitter is a non no but that an RCA switch box could be just the thing, yet all those I've seen are with L/R inputs and outputs + Video, rather than offering a single out. Hope this makes sense, I'm pretty new to this. Thanks for your help.
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