can i check LOC outputs?

[PaulC 10+ year member]

so ive had my setup in my 08 civic si with premium sound for about a year and a half now. i have an loc installed where the factory sub used to be. ive went through 3 subs so ive started to do reasearch. ive recently figured out how tune my amp with a dmm. now im wondering if i can check the outputs from the loc. would i use the same 50hz 0db test tone i do for tuning the amp? and would i check the voltage at the rcas coming out of the loc? and what should the voltage be? any advice or suggestions are appreciated except the ones telling me to just crank everything to the right haha

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[jordan572 10+ year member]

do you just stick a volameter into the rca ports to figure out how much is coming out of them?