Is that true? In that case the only way to make a 'proper' mono DCP of a classic, one would have to create at least a 4track DCP with three silent channels?

Or would a C+L/R or C+LFE work?

I remember a discussion on Film-Tech about the fact that a lot of commercial mono classic releases seem to be issued in L/R Dual-Mono, which is plain wrong...

- Carsten