【 Weak current College 】 audio THX ULTRA Certified knowledge and THX ULTRA2 distinction---Power By 【 China power house network 】

At present there are THX certified THXSelect, THXUltra and THXUltra2 three. THXSelect specifically for 2000 cubic feet (1 cubic foot = 0.0283 m³) of space services, THXUltra designed for more than 3000 cubic feet of space services-simply THXSelect provides budget limited consumer choice to provide a reference, THXUltra professional consumers. At present the latest certification is THXUltra2, this new specification is to full output 7.1 channel sound design, offers a very wide scale of sound field to cover a wider range of listening space, THXUltra2 's goal is to come from different programmes of multichannel sound source, whether it's movies or music, or whatever is 5.1 channel more channel program, can play the same system. This standardized playing system is provided for 7.1 channel THXUltra2, 3 front channels (left, middle, right), four surround (left and right side, left side, and rear right) and one subwoofer channel, its typical layout is shown in Figure 1. THXUltra2 certification more stressed the amplifier and speaker system, in order to support including HDTV and progressive scan DVD, program source, all the Ultra2 controller and receiver must have the video switching, and this switch does not cause deterioration of picture quality. THXUltra2 system can auto-detect the received number of channel program source and signal processing for specialized, separating out the direct sound and surround sound, and then how to use 7.1 channel, replay for Omni-directional, high-fidelity three-dimensional sound field effect.

THXUltra2 requires four surround sound box, two in the listening area of left and right sides, two in the listener's right behind. Standard Dolby Digital surround sound and DTS surround sound encoding does not directly provide so many surround, later Lucas companies and joint development of Dolby Laboratories, as well as the THXSurroundEX DTS Corporation DTS-ES is able to provide 6.1 channel. Obviously, THXUltra2 system belongs to a more advanced design, its purpose is to not only meet the practical requirements and future-oriented more multichannel surround sound encoded format.

THXUltra2 speaker layout mode is the two lateral surround sound box adopts pair polarity speakers so that the listener hear mostly secondary reflections, two surround speakers on the back of the conventional direct radiation speakers, directly facing the listener, but also between right next to each other. Obviously, this design is intended to enable lateral surround sound box playback surround sound environment information, while the rear surround sound box playback surround sound in direction or orientation information. According to Lucas's technical personnel, in this way enhancing surround sound field sense is still beneficial. He also pointed out that, in the actual listening environments, two rear surround sound box spacing should be based on user preferences and the average back surround sound intensity.

THXUltra2 on speaker performance of basic requirements is a smooth frequency response, high output, low distortion. And THX certification specification in the past, THXUltra2 relaxed compared to speaker directivity of requirements, requirements for the front speakers have a greater sound divergence angle, which is to improve the speakers in the replay music sound effects. At the same time, THXUltra2 requirements subwoofer has a lower limit frequency and increase the output power, this is to meet the movie sound and modern music on subwoofer replay requirements.




THXULTRA and THXULTRA2 difference


More information on attached THX-certified equipment category:

THXUltra and THXUltra2 is used for different equipment

THXUltra--> Interconnector, Equalizer, ProjectScreen, DVDPlayer (wiring, equalizer, projection screen, DVD player)

THXUltra2--> Speaker, Receiver, Preamplifier, PowerAmplifier (sound box, radio amplifiers, fore, back-stage power amplifier)
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THXSelect and THXSelect2 is used for different equipment

THXSelect--> Speaker, DVDPlayer (sound box, DVD player)

THXSelect2--> Receiver (radio amplifiers)

THXMultimedia--> computer sound box, sound card