Niki opener..russian intercoms..please help

wires are labelled L+ and L- and mic + - and sp ± . Does this mean I need solder ? Are these wires live ? I am not sure where the power is drawn from I can’t disconnect the whole building. :frowning: In addition , to avoid soldering I was thinking to cut the cables and add clip connectors to make changing easier…right ? This would still work ?