I am trying to put together a system for my large greatroom to be used for two channel music only. I'll be using a Marantz PM7200 integrated amp to power a pair of Monitor Audio Silver S1, Totem Model 1 or Totem Rainmaker monitors. The room is quite large (24'x34'x9') and my wife won't go for a pair of full range tower speakers so I've decided to go with a monitor/subwoofer combination. I don't want to shake the foundation but I do want to extend the bass and free up the monitors to do what they do best (mids and highs). Any suggestions for musical subs would be appreciated.