THX Ultra 2 is the first THX standard that was completely developed for digital home cinema sound standards.
THX Ultra (1) was still based on the "original" Home THX, which was already used in high-quality AV amplifiers/receivers during ProLogic times.
THX Ultra (1) was still based on the "original" Home THX, which was already used in high-quality AV amplifiers/receivers during ProLogic times.