Thanks for replying Boju,
These are the speakers: https://www.sony.co.th/en/electronics/hi-fi-systems/shake-x7d
Here is the diagram of the speakers: https://servlib.com/sony/audio/ss-shakex1-ss-shakex3-ss-shakex7.html?start=4
Now back to my sub-question question No. 2, Shall I connect grey...