Amps preamp output voltage?

[Suggin]

I don't have a meter right now and was wondering how much voltage was going from my sound ordnance m4075 rca output into my sub mono amp? I have it wired this way because I'm currently using the head units rear/sub preamp output for my rear speakers.

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[Suggin]

Or since my headunit puts out 2v per output the amp does the same?

 

[n2audio 5,000+ posts]

It should be very close to the same as the HU.