try to locate a dolby cp650 manual online. The surrounds in SRD are quite different to those for 5.1 music for example.
I think they rollof near 200 in the lows and above 3k to match the x curve on the fronts.
The other reason why surrounds sound crap in cinemas is because they use cheap arsed speakers. It is seen as a way to cut costs. In short, you really shouldn't rely on the surrounds to make you mix sing. The best mixers concentrate on getting LCR sweet and they acknowledge that the most commonly miss aligned parts of a cinema are the sub and surrounds. Hope that helps
Hello! I'm reading your comment in the post production forum :"The dolby cinema processors band limit the surrounds. Its a little hard to replicate with out a cp650/etc but the screen channels are full range. Dolby spec requires 105 (or is it 110db) with out distortion at the mix position, and so cinemas are supposed to be the same". Do you know where i can find general info for band limiting the surrounds in cinemas? Here in Bulgaria there are two cinemas where the surrounds sounds like a telephone and when i talk to operators from the cinema they are saying that the dolby cp650 is at the bottom of it. We have a cp650 in our dubbing stage, the surrounds are the same, but i need something already written to convince the people from the cinemas that i'm right. Here these things are very tough, because most of the people that are working there don't know what they are doing! Finally my mixes sounds thin and bad in the surround channels. Thanks in advance, and sorry for my bad english