The radio input module on my Quad 44 pre amp is rated for 100mv & 1M ohms. Would it be safe to run a headphone output from a Mega Drive to it? The headphone output has a variable volume control. I have used the Mega Drive, TV auxiliary out and pre-outs of an AV amp on one of the tape inputs set to 100mv and they worked fine but not sure of resistance of those inputs. Could I damage the input board? Or can I run it safely with the headphone output set low?