Demetrios, I suspected that you might be thinking that the EP500 somehow would do some processing for another sub, so I phrased my previous response to indicate that only the receiver would do the processing for the second one. The output for a "daisy chain" is simply an internal "Y" arrangement in the sub: one branch goes into the sub amp and the other just goes straight through to the output without being processed in any way. It's the same as if the connection to the second sub was coming directly from the receiver.
I'm really not following your proposal, especially the above and below 60Hz division. I don't know how that would be accomplished or what benefit would be had.
Although you have a sub driver now, it would seem that the expense and complication of an amplifier and enclosure for it might make simply buying another(less expensive)powered sub a better option.
