Krell KAV 300i Theatre Throughput Mode?

As the owner of an early release KAV 300i, I need some help with switching to the "theatre throughput" mode in which makes the amp capable of functioning as a power amp only, via the "S3" input. Does anyone know how to go about this? Otherwise, perhaps could scan me the part in the manual that mentions the procedure?

I hope you guys can help.

Zam (email:
I'm not sure if the 300i operates the same way as 400xi that I have, but here's the 400xi manual:

On page 17 there's a description on how to configure
the KAV–400xi for Theater Throughput.

Good luck,