Mojo,
Items to simulate, that is a good question. It might be hard to find something with the exact absorbtion as 703. Lets seeee....hmmm
maybe a bunch of bean bags stuffed in corners, or a bunch of thick removable seat cusions from a couch stradleing the corners, or you could go to a local home improvement store and buy some roles of insulation (in plastic bags) and just stack them in the corners from floor to ceiling. When your done you could return them since you didn't open the bag and you would have a receipt. I'm sure there is something else you could try, maybe lean some roles of unused carpeting up in the corners left over from when you carpeted your house.
