FM3 into Matrix GT1000FX which Output2 setting?

[Japster]

Hi,

Moving from a FM3 FRFR setup to FM3 -> Matrix GT1000FX and Mesa vertical 2x12 for my backline

Going to keep my Output 1 for my desk feeds, so gonna use Output 2 for sending to the Matrix.
What should I use for the Output 2 setting?

Unity Gain - seems too weak, whatever the db setting
Line Level - seems a lot better, but not sure if I should be using -10dbv or 4dbu

Anyone know the correct setting to match the Matrix inputs?
The inputs state 0db 0.775v

Any help appreciate,

Thanks

 

[Simon Godden]

It should be line level +4dbu

-10dbv is more for consumer grade gear