How can I get the PC3’s digital output to work and have it sync to an external clock?


All references to the “PC3” apply equally to both the PC3, PC3K and X-Pro models.

1) Connect a 75-Ohm coaxial RCA cable from the PC3’s RCA Digital Out jack to the S/PDIF or AES* input of the receiving device.

2) Connect a 75-Ohm coaxial RCA cable from the Master Clock device’s S/PDIF or AES/EBU* Out jack to the PC3’s “Sync In” RCA jack.

(TIP: *you may need RCA-to-XLR adapters to connect with your other devices, depending on their connectors. If the other devices you are interfacing with only offer optical connections, you’ll need a converter.)

3) On the PC3, press the Master mode button, then press [OUTPUT]:

4) The PC3 can sync to rates ranging from 20 to 220kHz. Three ranges are offered: Ext 20-60k, Ext 60-120k and Ext 120-220kHz. Set the output sample rate (Dig. Out) to one of the external rate ranges, encompassing the rate you are going to send to the PC3:

5) Set the Digital Out Volume (Dig. out volume) to either “Variable” or “Fixed”:

Variable = output volume will be dependent on the front panel master volume slider
Fixed = volume level is constant, set at full, ignoring the position of the master volume slider.

6) Set the device that you are connecting the PC3 into (or separate Master clock source), to transmit its clock to the PC3.



  • The signal fed to the digital out always mirrors the Main L & R analog outs (i.e. any signals sent to the Aux outs will not appear in the digital out).
  • Sync In is NOT a “Word Clock” input. Only a valid S/PDIF OR AES/EBU signal is recognized.