Sub preout on Krell Home Theatre Standard preamp


i recently acquired a Krell first generation HTS preamp. Works great. 

My question is about the subwoofer preout. Does it only activate when surround sound mode is engaged?  It appears to me to be the case, but I just wanted to check if I wasn't missing something. 

ghrant19666

Usually, if you configure all your speakers as large, then the sub out will only play the LFE track.  If you configure your main speakers as small (with a high pass filter) then the bass will be redirected.

Ok, interesting. Thanks for the guidance , I'll play around with that and see what happens.