Questions about my first amp build with Icepower 125asx2

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Hi,

I am building my first amplifier with 4 x Icepower 125asx2 modules wired for BTL mode. I am using RCA to XLR (RTX) converters which also acts as an input buffer from Ghentaudio. I will only have unbalanced RCA connectors on the amp. I am wondering if the RCA connectors should be isolated from the chassis or not in this configuration? Have not been able to figure this one out, and I thought that I would ask someone more experienced before I ruin everything :)

I uploaded a picture of the build. Bad picture and a little messy... The black unconnected cables are shielded RCA cables which I am going to connect when I get the RCA sockets in the mail. The dark blue cables are also shielded, with balanced signal from RTX modules to 125asx2 modules. The red and green cables are AUX power supply from 125asx2 to the RTX modules. The white and blue cables are AC mains wiring. Does this look safe? I have seen people wiring these modules that way with two modules, but not wit four. I hope there is no difference, and this AC wiring is ok :D

Is there any precautions I should take when powering it up for the first time? Should it be with speakers and input signal connected or not?
 

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