Both constantly adjust for changes in input levels, bringing up low levels, and reducing gain for high levels. The ST-GCA1 is the ideal choice anywhere potentially varying audio levels need to be maintained at a constant level.
Circuitry is gated to mute the output when no input signal is present.
The fast action of the ST-GCA2 makes it ideal for use in systems prone to loud bursts of audio. The ST-GCA products then adjust the gain to deliver a uniform output level at all times. The audio level is constantly adjusted to maintain the correct output. This normally slow AGC action is supplemented by a circuit which detects the amount of peak material present and speeds up the AGC correspondingly. The ST-GCA1 helps maintain good overall adjustment without impacting the overall dynamics of the program material.