I have never heard the Ultra 2 system, but I do have the RF-83 and a set of RF-82 for rears. There is large diference in sound between the two. I did a side by side compares to see if the RF-83 were worth the extra cash. They are. The RF-83 are a more refind sound. The RF-82 are a good buy for the money less than half the cost of the 83s. Also have the RC-64 and Velodyne DLS-5000 and DD-15 for the subs.