Asus Xonar Essence STU Manual page 2

An operational amplifier (op-amp) plays an important role in audio performance
and tonal style by creating distinct listening experiences. Catering to the needs
of audiophiles, Essence series streamline Op-Amp modifications with easily-
swappable op-amp sockets.
1. Swap guide
Change all the OP-amps of the same types in the same slot. For example, if you
need to change DAC I/V (slot 1), you would need to change all the OP-amps
of the same types in all slot 1. If you need to change LPF (slot 2), you need to
change the OP-amps of the same types in all slot 2.
NO. Items
1 I/V Slot (slot 1)
2 LPF Slot (slot 2)
3 DC Servo
1. Serves as I/V (current to voltage convertor) that turns current from DAC into
voltage for output purpose.
2. Serves as Low Pass Filter that filters background noises.
3. Serves as DC Servo for the headphone. Changing this will affect the
headphone output.
2
ASUS Xonar Essence STU Opamp Swap Guide