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Message: <blockquote data-quote="Themerkle" data-source="post: 8673221" data-attributes="member: 676911">Right, I'm with you so far. The "normal" setting on the amp gain represents a 2v preamp outout, and the Sony Xav-ax100 matches that 2v preamp output, so I set the gain there to start. Next, I verified that the full range of frequency tones, from 50hz to a little over 1500hz, was all a clear hum and no buzzing. Then, I turned the head unit volume up until I found the lowest frequency where the hum turned to a buzz. That happened around 430hz once the HU was up to about 42 volume. I backed it back down to 41 volume, which I've determined to be my max clean volume. Now, here's where I get confused: if I turn the volume DOWN from there to anything under ~30, speakers will start cutting out. If I try to adjust the gain up or down at all, speakers start cutting out. </blockquote>

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