connecting a sub-woofer to a preamp


I recently purchased an Ayre K-5xe MP preamp and would like to connect a sub woofer to my system to augment the bass response of my ET LFT-8 speakers. Previously with a YBA preamp this was just a matter of utilizing one of the additional output jacks.

However with the Ayre this is not the answer.

Does anyone have any suggestions? The Owner's manual is silent in this regard. I've also e-mailed Ayre twice over the past ten with this question and am still waiting for the courtesy of a reply...

Thanks in advance for any advice that you may care to pass along...

Peter
blues27
I'm running a sub just fine with my K5xemp. Balanced interconnects to my power amps, and two single endedinterconnects to the inputs of my Fathom F113. 
The single-ended outputs are what Charles Hansen recommended for my KX-5 Twenty.  They go to a Velodyne SMS-1 bass manager that controls a pair of Velodyne HGS-10s.  He strongly discouraged inserting anything, e.g., high-pass filter,  between the preamp and VS-5 Twenty amp.  The integration is sufficiently good that I can't identify the subs as a sound source, it just sounds like a pair of full range speakers (KEF LS50s).