EAW UXA4401, User Manual

Configuration

5.5 GPIO Setup and Connection

UXA4401 amplifiers provide a GPIO socket that enables 

remote control of volume, standby, mute and trigger functions. 

The GPIO connector pin functions are described in the 

GPIO 

Settings

 menu illustrated in 

Diagram 4v

. The connection of 

GPIO based remote volume control and standby/mute are 

illustrated in 

Diagram 4w

 and 

Diagram 4y

 respectively.

Note: The GPIO connector must not be used for any unintended 

purpose. Amplifier damage may result from incorrect use of 

GPIO.

Note: Shielded cable must be used when connecting standby 

switches and potentiometers via GPIO.

Note: GPIO Pin 8 has a low output impedance and is able to 
supply a maximum current of 10mA.

Note: GPIO Pin 1 and Pin 3 both offer ground connections: 
Pin 1 is connected directly to the amplifier chassis.

 Pin 3 is connected to the chassis via a 220 Ohm resistor. 

The ‘soft ground’ connection of Pin 3 is potentially useful for  
managing ground loops that may cause audible hum. 

Diagram 4v 

GPIO Settings Menu

Diagram 4w 

Potentiometer connections for remote vol

-

ume control via GPIO.

Note: Diagram 6c illustrates 

use of the GPIO connector. 

Diagram 4y 

Connections for remote 

standby/mute switch via GPIO.

Note: Diagram 6c illustrates 

use of the GPIO connector.

Gr

ound

+3V3

Gr

ound

Standby/Mute

Potentiometer

(>10kΩ)

Connect Wiper to 

Pin 4, 5, 6 or 7.

Switch open or closed 
toggles Standby or Mute 
depending on options 

selected in the GPIO 

Settings Menu