I have the opportunity to look into purchasing a couple of new wireless beltpacks & microphones for my theatre department and was wondering a few things. I want to stick with Sennheiser since we already have a few sets and they work great in our building. 1) What is the basic difference between the EW172G2 model and the EW112G2 model? I can't seem to find much of a difference, yet they are listed at different prices. 2) Is the higher model number an indication of a "better" system? Thanks in advance!