As a follow-up to this post, I just bought one of BJ's KM140 bar sets - I'm familiar with when to use ORTF but am not very familiar with DIN vs DINa vs NOS, so some more clarification on when folks use which would be appreciated. For instance, when you find yourself at the sbd of a theatre or a venue like the Fillmore in SF that is too far back on the floor for ORTF, which of these would you then use and how do you choose between them?