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Look at the bottom of the meter scale in the middle. See where it says Ohms per volt. The impedance is 5000 ohms per volt on the scale selected on ac and 20,000 ohms per volt when on dc. I have no idea what you are talking about hooking it to your speaker leads to set the RX. I have neen using all sorts of multimeters for nearly 40 years and that one beats me. I have used them to measure audio output levels if that is what you mean but they generally require a 600 ohm circuit to be accurate and the results are in db not voltage.