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kind of new to the amplifier thing. Just hooked up my new worldwide mf440 and if i turn the amp up past half way my audio distorts. SWR is perfect the radio is stock if i turn the rf power down from 4watts to 1.5  as low as it goes (on radio) it seams to get beter. Gets better with mic gain turned down also. Am I overdriveing the amp overmodulateing? Running a wilson 5000 perminant mount. I would think i should be able to turn it up past half way?:headbang