I strongly recommend not doing this. First you need to be at least 10' away from the SC-IV for good driver integration. With a 20' lenth, you can achieve this with the listener about 4 feet off the back wall and the speakers about 6 feet into the room. The narrow room can be dealt with from absorption and diffusion. It's not easy, but not insurmountable. The real problem is the bass. You have a lot of driver moving a lot of air in a small volume. By the time you get reasonable inertia on the low frequency drivers you will likely be overloading the room and have some really significant bass peaks and in general just more bass relative to mids and highs. You can (and would need) a parametric EQ. Our company makes one, the Rives PARC, and it's extremely useful, but we would recommend more appropriate speakers for that room size rather than trying to fix the inherent problem with an eq.
