Go with the 20-39pci. In a large room, you'll want the extra output. This sub still gets down to 16Hz with very usable output at the seated position. Most people going with the 16-46 seem to end up getting a second 16-46 for added output. Few movies utilize the 10-15Hz response the 16-46 is cabaple of, and at the added expense of output, the 20-39 IMO is the better choice.