Weak signal output of preamp

I am using REW to take some measurements

My issue is that I am getting a very weak preamp signal out to the drivers. With a 20 watt amp I can barely hear it. With a 100 watt amp on a 3 way I have to turn it up to max just to get it to 75 db

What am I doing wrong here?
 

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This is the only preamp I have and I just got it. First time using a preamp. I have tried turning up the output all the way without any change. Actually, I have hit every single button and turned every knob on it without it changing anything.



REW still outputs the same super weak signal out of the preamp
 
Yeah, and for those of us who use computers more as an appliance, Macs are great.
I've still had no problems after 25 years of use. They just work.

For those who think Macs are expensive, try adding in the cost of Windows support, and all of your wasted time.