Carvin PA1200 Pre EQ inserts

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My problem is that when I run a signal in to the pre EQ inserts on my
Carvin PA1200 I get nothing. I know the PA1200 works fine. I have a
Mackie 1202 which I connected to the Carvin. I connected the Mackie's
Main Mix to the pre EQ inserts on the Carvin but got nothing. Just to
confirm that I am getting a signal from the Mackie I got out my old
Peavey XR600 and connected the Mackie's Main Mix to the Peavey's PA1 &
PA2 jacks, and it worked fine. My best guess is that the Carvin's pre
EQ inserts need a stronger signal. Does any one know what level I
should be feeding the Carvin's pre EQ inserts? I think the Mackie's
output is around +4db. If the problem is that I need a stronger signal
to the Carvin any pointers on where I could find a booster to do boost
it?
Thank you, Jon