Hello Ethan...If we do a low frequency response test as laid out in "http://www.realtraps.com/test-cd.htm" we should get a plot with 70db as the mean line, with variations above and delow 70db, based on the interference happening in the room. Why is the plot shown in the link different. The mean is around -15 db. and what does negative sign for db mean. Thanks. - Pradeep