A:Answer Hello Nik,
Thank you for your question. Firstly, apologies, I cannot see the picture you have attached. Ideally we would recommend connecting to the system via a TRS to TRS cable into input 2. This will effectively output as a 1 channel speaker. Perfect if you want to run two L1 compact systems as a stereo pair.
If you want to send both Left and Right channel audio, then a Y split TRS to TRS will also suffice.