Asus Xonar Essence STX Xonar Essence STX OP AMP swapping guide

Xonar Essence STX

OP AMP socket pin description

Please refer to the photo above. A, B, C, they are the three sockets
for OP amps. Modifying OP A,B and C will change the tonal quality of
RCA outputs, while modifying OP A and B changes the tonal quality of
1/4” Headphone output.

Their pins description is as following. Pin 1 is at the left and bottom
corner. You can change OP amps that meet following requirements.
There are two OP amps in each 8 pin package.

A. Right channel OP socket----I/V converter

Pin 1: OPA A output.--------------5.85 Vpp output
Pin 2: OPA A negative input-----7.8mA input
Pin 3: OPA A positive input------7.8mA input
Pin 4: -12V
Pin 5: OPA B positive input------7.8mA input
Pin 6: OPA B negative input------7.8mA input
Pin 7: OPA B output.---------------5.85 Vpp output
Pin 8: +12V

B. Left channel OP socket------I/V converter

Pin 1: OPA A output.--------------5.85 Vpp output

Pin 2: OPA A negative input-----7.8mA input

Pin 3: OPA A positive input------7.8mA input

Pin 4: -12V
Pin 5: OPA B positive input------7.8mA input
Pin 6: OPA B negative input------7.8mA input
Pin 7: OPA B output.---------------5.85 Vpp output
Pin 8: +12V

C. Right and Left channel differential to single end

Pin 1: OPA A output.---------------2Vrms output

Pin 2: OPA A negative input------5.85 Vpp input
Pin 3: OPA A positive input-------5.85 Vpp input
Pin 4: -12V
Pin 5: OPA B positive input-------5.85 Vpp input
Pin 6: OPA B negative input------5.85 Vpp input

Pin 7: OPA B output.--------------- 2Vrms output

Pin 8: +12V