[yuubi]

Dolby digital could be used without replacing much existing equipment: the sound head looked like it bolted right onto the 1940s-vintage projector in the one installation I've seen. would look like it belonged if the projector wasn't gray wrinkle paint and the sound head smooth black finish. yes, several parts have been updated, including the light source and a platter system, but again it looks like none of this involved doing any violence to the actual projector.

[icodestuff]

There were several projectors (such as the Century JJ) which could show 35 and 70mm that were stuck with only 35mm capability after the Dolby Digital upgrade; the mounting location blocked the 70mm egress slot. There were workarounds that involved hacksaws dremels, and a new roller, but not very good ones.

[lflux]

Depending on your projector and the amount of space you can fit one or two digital heads in there. We modded our 1950's era Bauer U2's to add DTS readers upstream of the analog sound readers, but at the expense of the 70mm magnetic sound heads. Took about an afternoon.

[davidferguson]

If you try hard enough you can fit more! I've seen a projector with all of 35mm optical, 35mm mag, DTS, Dolby Digital and SDDS. Was a sight to behold!