I think you nailed the lack of warmth that you are hearing within this response. I would be very surprised if there was not a hole in the frequency response with your current equipment. There is a limit to how much bass a small cone and enclosure can produce, and you do not want to force your subwoofer to handle frequencies much above 100 Hz as you will then be able to localize the source. I'm curious as to your reasons for leaning toward tower speakers? I believe that as your room size and distance from the speakers diminishes, there is better imaging from speakers that approximate a point source, that is, all the sound originating from a single spot. Anyone care to comment on that?