![]() For example, a 500W RMS amplifier at 2 Ohms would configure like this: 500W RMS X 2 Ohms = 1000W. Step 5: Now we must find the voltage that we need to set the gain to. Turn your radio dial to it’s maximum volume and multiply that number by 0.75, this will get you 75% of your maximum volume. Step 4: Set the head unit volume to 3/4th of its maximum volume. Make sure the input voltage selector is on “Low” if the amplifier has one. For most amplifiers, this is counter clockwise (CCW) to the farthest point. ![]() Step 3: Turn the input sensitivity (gain) to zero. Step 2: Turn off all EQ settings or set them to zero, such as Bass, Treble, Loudness, Bass Boost, Processing and EQ functions. Step 1: Disconnect the positive speaker wire(s) from the positive terminal(s) on the amplifier. For those of us with a Digital Multi-Meter (DMM), setting your gains this way is the most effective method aside from using an oscilloscope. We first covered how to set your gains by ear in the article titled “ How to Tune and Adjust Amplifier Gains and Bass Boost”, however this is not a great method to use because all of our ears are different and we often can’t hear the most deadly distortion. The purpose of the gain control is to level match the head unit’s output voltage to the gain structure of the amplifier so that the input is not overdriven which would introduce clipping. ![]() The gain adjustment control on an amplifier is one of the most misunderstood concepts in the car audio world.
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