Peavey Q 431F is a 31-band graphic equalizer with Automatic Feedback Locating (AFL) LEDs to identify and eliminate feedback quickly and easily. The unit features constant "Q" filters for precise equalization, and a bypass switch to remove the EQ from the signal path. The AFL system uses LEDs to indicate the frequency band with the most energy, making it easy to identify potential feedback problems. The Q 431F also has a low-cut filter to reduce low-frequency rumble, a gain control for adjusting the overall output level, and balanced inputs and outputs for professional connectivity.