TL Audio M4 - Manual (Page 14)

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Wordclock Input
A rear panel input (on the back of the DO2 & DO8 card) is provided for
connecting the M4 to an external master clock source. The wordclock input
connector is a BNC-type terminated in 75 ohms.
A FINAL WORD
We hope you will enjoy your new M4 console, we're confident that once you start
using it you'll wonder how you managed without one!
For best results, switch your M4 console on 30 minutes before the start of your
session to allow the tubes to fully warm up. Enjoy!