I doubt it's the equipment and I'm sure it's more my understanding of how this works.
Step one, trying to determine the maximum volume before distortion on my head unit. Output RCA is plugged directly in to the DD-1+. Everything is set to flat. Crossovers on the head unit set to "Through". If I go MAX volume, Kenwood DMX906S, which goes to 40, I get zero distortion being detected, but the RMS V is still 0.0.
Also, it seems Unless I go to MAX volume, the tone isn't detected until around volume 39.
Does that seem right? The head unit claims to have 5v outputs. Something doesn't feel right.
Thanks