sentences:  More than likely it would have garnered far less penetration had Sony not controlled both a theater chain and a film studio.SDDS was consistently the least popular of the three competing digital sound formats, the other two being Spectral Recording Dolby Stereo Digital and DTS.Along with being the most expensive to install (and the last to arrive), there were major reliability issues with SDDS due to the change from the prototype sound track placement to the very edges of the film stock where the film is subject to damage.