Hey guys. I'm currently running two 12" type R's and I'm looking for an upgrade in the SQ department while trying to keep.the volume of the type rs. The two 12's in the topic are what I have it narrowed down to. I'm leaning more towards the RE's because I've found many more reviews on them than I have the IA's and they're about a hundred dollars cheaper. Any thoughts? Oh. They'll be running on a sundown SAZ1500 and will be in a sealed box with 1-1.25 cubes before displacement.