Amplify+ Adjustable Gain Preamp for Professionals

Troubleshooting CM-7777 CM-7778 CM-7778HD Preamp Connections and Voltages
Preamp Connections and Voltages CM-7777 CM-7778 CM-7778HD The following is the sequence to connect the CM7777, CM7778......
I'm confused about the inputs and switches on the Amplify+ CM-7778HD
There are two inputs on the Amplify+ CM-7778HD preamplifier. You can open the amplifier up by removing the 4 screws......