41Hz amp9 nominal input level

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Anyone know the nominal input level for the Amp9basic please? Am using with a Najda DSP preamp and am following the manual instructions as below.

"Please check your amps documentation for their
nominal input level. Global output level can be set anywhere between 1 Vrms and 6 Vrms."

Amp9 manual says the following but I need a voltage number between 1 and 6;
"Line level analogue audio inputs with fixed 30dB gain & input impedance 50K "
 
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