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GRS

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  1. Trying to tune my amp (GM-A6704) with a MM, install is a few years old and it has never sounded great. I can only get 5V or so out of the amp with the gain turned all the way up. I’m using a 1Khz, 0 db text tone. I tested the preamp output levels at the head unit and get 0.04 volts! Head unit specs say preamp output is 5V max. Volume is set to 3/4. MM is set to 2V AC. I am thinking the head unit is bad but looking for advice. Could I have something set incorrectly in the head unit to create this issue?
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