DTS 5.1 audio has been very common,
But THX certified audio is still relatively strict a lot of such equipment is mainly for home theater, as long as it is a genuine brand, you can rest assured to buy the use of the sound effect is very shocking.
THX certification standards are developed by Lucasfilm (Lucasfilm), designed for home theater quality assurance, as well as for home audio-visual equipment (home theater) to provide a complete quality specification norms. THX standards and international standards are different, most of the standards have a tolerance range, but the THX does not have a tolerance, there is only a minimum requirement must be exceeded in order to qualify, eliminating artificial cats. The THX standard eliminates the need for human error.