Wayne Parham Messages: 18792 Registered: January 2001
Illuminati (33rd Degree)
Some prosound amps have switchable input levels. It's usually an internal switch, or sometimes on the back panel. If your amp has one, then you can set it to 0.775v and use it with commercial preamps. If not, then the volume level would be too low.
Also make sure you have unbalanced inputs on the pro amp, because most commercial gear runs unbalanced signals through RCA connectors.