JFA Electronicos AP400 - Page 13

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6.2. RCA CONNECTION
Using any amplier with a higher amplitude input signal signicantly
improves the signal-to-noise ratio.
For situations where the amplier is set incorrectly, for example, if the
setting is made so that at 50% of the player's volume, the amplier
provides maximum power, if the volume is raised above 50%, at the bass
peaks the amplier will be distorting the output signal (clipping), even if
in some parts of the song, it really is playing louder.
To adjust the audio with the best signal to noise ratio and minimum
distortion (THD), simply reduce the amplier's LEVEL setting to the
minimum, reducing the input sensitivity as much as possible. Then set the
player's volume to maximum and raise the amplier's LEVEL setting until
maximum power is obtained.
Input signal - HIGH
Input signal - LOW
Noise Floor
Signal Power
Time
AP400 AND AP800 AUDIO AMPLIFIER - INSTRUCTION MANUAL