I'd like to know what is considered typical practice regarding bass. I've heard comments from time to time like "bass is mixed mono below 100 Hz." In the context of mainstream movies and music, is there really a standard practice? I'm not too concerned about what a small niche might do, but what the majority. Here is the context. I'm working on an article on bass integration for 2 channel and HT systems. If the bass is summed mono below 100 Hz, but stereo above 100 Hz then the mains can smooth each other out in bass response below 100 Hz, but not above. Hence they need to be measured individually above 100 Hz.