guitar to speaker

I'm trying to help my brother connect his guitar to a speaker(many speakers in the house), i have tried the following setup but no luck.

I have a 6.3mm Mono Jack(Guitar end) to 2xRCA Phone plugs male(red and white), after this i connect the RCA Phone Plugs to a 2xRCA(females) to 3.5mm jack(male) which fits into my speaker.
But when connected i don't hear nothing .

Yet if i have tested the connection with other devices in place of the guitar which play fine both ways forward or backwards, i need help please

Image attached of the parts i have excluding the guitar and speakers


Solved

 

wouldn't you need an amp between guitar & speaker otherwise whats supposed to drive the speaker

 

its not really my area, I'm just helping him.

Fixed the issue, the guitar needed power as well.
so i just linked it to the pc mic socket bingo

solved

 

lmao