Question I want to add second wired subwoofer to my soundbar with wireless sub

[avichaterji]

I want to add a second wired subwoofer to my LG soundbar which has wireless subwoofer.
I'm not too technical, so kindly guide me the possible way outs please.

1. Can I use a hdmi splitter ? Would both eARC Atmos, dts decode for soundbar and the extra wired sub work together ? Or there will be any delay or sound mismatch ?

2. My LG C3 has a optical out & AUX out , can I connect extra wired sub in that ? Would it work in tandem with the eARC soundbar with Atmos & DTS decode ?

Any step by step guidance will be much appreciated which really works .

Thanks