I just purchased a set of Eris 4.5 studio monitors. On all the reviews I read and in pictures of the product, on the back of the speakers are an Acoustic Space switch that you can set in response to the layout of your room. When I looked at the back of the speakers, it was not there, just two knobs that allow you to adjust Highs and Lows by 6dB! Why is there not an Acoustic Space switch and can I adjust the 2 knobs to get the same effect as the Acoustic Space switch? I'm asking because my speakers are quite close to the wall (about 5 inches away) so I'm worried about having bass build-up and therefore not giving me accurate monitoring.