I have a DS18 Candy Mirco4 that I’ll be using to power two speakers. I would like to add an amplifier to power a sub, which will allow me to install a volume control knob for the sub only, and the Bluetooth receiver I’m using only has one amp output. Can I use a LOC from the two unused channels from amp 1, and connect RCA cables from the LOC to the second amp? Any other suggestions are welcome!