Hi Dimitry, though I've never used my EP with a sub (because I don't own a sub), having a pretty good idea of the strengths and relative weaknesses of the EP in a high-powered application, if I were you I'd definitely want to experiment with plugging the sub or subs straight into the wall to lessen the demand on the EP, possibly benefitting the other components attached as well as the sub(s).
(Even putting the other components aside -- and admitting my lack of experience in this particular area -- I have to wonder if the EP can really benefit a sub at all. A subwoofer, after all, functions as a steep low-pass filter by definition, with a a turnover frequency that's likely to fall below even the first harmonic of the AC powerline.)
In my system, I've kind of arrived at this rough rule of thumb: If the power transformer in an attached component is physically bigger than the one in the EP, never mind the ostensible wattage ratings, don't take anything for granted -- experiment! As I posted on another EP thread recently, having tried plugging my high-powered monoblocks into my EP and into the wall (via an Equi=Tech 2Q), I find myself wishing there was a way to feed the amps' input and driver stages from the EP, and the output stages from the wall (but since these amps, like most, have but a single main power supply shared by all three stages, this would of course be impossible without a great deal of custom modification).