[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!