I just ordered a LFM-1 Compact last night on line. My main listening area is around 800 cubic ft. Then there is a large opening where my computer desk is. That is about another 950 cubic ft. So I am coming in at less than 1800 total. The area where I need to locate my sub would not accommodate the LFM-1 Plus. After looking at several options, I came to the conclusion that the Compact should be enough for my main listening/HT area. I am using a Denon 3808CI, with Paradigm Studio 60's with matching center. I have smaller JBL surrounds. I am replacing a JBL sub with the Compact. The JBL is 11 years old. It only is rated to 40Hz. It is also only 150 watts. It is ported on the front and has two 8" drivers. One powered, and one passive. I am hoping the Compact will really help fill out my system. Once it arrives, I will try and post what I think. Man I hate waiting on shipping.