How to take measurements without burning out the equipment =D

[Bl00dWolf]

Hello.
I have an E2X2 OTG and DX9, BTR17, and a couple of other things.

I would like to use REW to measure roughly the same things as Amir did for devices, but at an amateur level.

I'm not quite sure how to do it correctly yet, so I'm asking for help, because as I understand it, it's quite possible to burn out the E2X2 with incorrect connections.

1) To measure the DX9, will it be enough to connect its RCA or XLR (L+R) outputs to the E2X2 inputs, but not XLR, but TS\TRS, since the e2x2 LINE IN is only via TRS \ TS on the front, right? And is XLR on the E2X2 only for microphones?
2) Similarly, can I connect the E2X2 TRS outputs to the TRS LINE IN inputs so that it measures itself?
3) How do I correctly connect the XLR 4 PIN \ 4.4 MM headphones outputs from the DX9 \ BTR17 to the E2X2? I understand that I need to be careful not to burn the E2X2 ADC in the process.

Thank you in advance for your answers!

P.S. Yes, I know that the measurements will be limited by the capabilities of the E2X2 itself, but that's fine.

 

[Sokel]

Before touching anything at all make ABSOLUTELY sure that 48V phantom power is disabled.
Checking out visually alone won't cut it, use your DMM and measure first.

Other than than,yes, just a loopback, minimize gain to zero, etc.