▁" c ros so ver " ▁or ▁" ex periment " ▁as ▁well ▁as ▁in ▁hom age ▁to ▁Lucas ' s ▁first ▁film , ▁TH X ▁ 1 1 3 8 . ▁The ▁distinct ive ▁gl iss ando ▁up ▁from ▁a ▁r umb ling ▁low ▁pitch ▁used ▁in ▁the ▁TH X ▁tra ilers , ▁created ▁by ▁Hol man ' s ▁cow ork er ▁James ▁A . ▁Mo orer , ▁is ▁known ▁as ▁the ▁" De ep ▁Note ". ▁ ▁The ▁TH X ▁system ▁is ▁not ▁a ▁recording ▁technology ▁and ▁it ▁does ▁not ▁specify ▁a ▁sound ▁recording ▁format : ▁all ▁sound ▁formats , ▁whether ▁digital ▁( D ol by ▁Digital , ▁D TS , ▁S DD S ) ▁or ▁analog ▁( D ol by ▁S tere o , ▁Ult ra ▁S tere o ), ▁ ▁can ▁be ▁" sh own ▁in ▁TH X ". ▁TH X ▁is ▁a ▁quality ▁ass urance ▁system . ▁TH X - cert ified ▁the aters ▁provide ▁a ▁high - quality , ▁predict able ▁play back ▁environment ▁to ▁ensure ▁that ▁any ▁film ▁sound track ▁mixed ▁in ▁TH X ▁will ▁sound ▁as ▁near ▁as ▁possible ▁to ▁the ▁intent ions ▁of ▁the ▁mixing ▁engineer . ▁TH X ▁also ▁provides ▁cert ified ▁the aters ▁with ▁a ▁special ▁c ros so ver ▁circuit ▁whose ▁use ▁is ▁part ▁of ▁the ▁standard . ▁Cert ification ▁of ▁an ▁aud itor ium ▁ent ails ▁specific ▁ac oust ic ▁and ▁other ▁technical ▁requirements ; ▁architect ural ▁requirements ▁include ▁a ▁floating ▁floor , ▁b aff led ▁and ▁ac oust ically