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Message: <blockquote data-quote="JimGore" data-source="post: 407563" data-attributes="member: 3">The only thing the gain adjustment does is ensure maximum unclipped output for the given minimum impedance load.What I will most likely do is build the amplifier such that it allows manual adjustment of the gain. When its in working condition, I will measure the maximum power before clipping into a couple of points using fixed resistors as the load. Perhaps one measurement every 0.5 ohm or something to that effect will be good enough. I will make these measurements whilst keeping the input levels constant at a reasonable level such as 1 or 2V RMS. I will then manually adjust the gain to the point where it just starts clipping, and take note of the resistor values used in order to achieve the required output.From there I have a table which provides the gain settings for each 0.5 ohm step. These will show the levels where the amplifier just starts to clip, so I will need to build some margin in - perhaps to the order of 3% drop for each gain ratio. These figures I can implement into the microprocessor which will then control the gain as needed for the driven load after the microprocessor has read the minimum imp of the connected load.</blockquote>