The A90 Discrete is the discrete component version of the A90 amp. Contains almost all functions of A90 and Pre90. In addition to using discrete components to form an amplifier circuit, the following functions are added:

1. Greater output power.

2. Use the relay to control the volume and support many custom settings of the volume.

3. Support remote control.

4. Support EXT90 to expand more input.

5. Add the ground loop cut-off switch to solve the ground loop noise problem.

6. Added 12V TRIGGER function, which can be switched on and off synchronously with other devices with the same interface.