THX is a quality standard that guarantees the best possible playback for specific room size. Since THX was originally developed for cinema theatres, the specifications apply to room sizes that far exceed the average living room size.
THX currently differentiates three standards for speakers: THX Ultra 2, THX Select and THX Multimedia.
THX Select 2 only applies to AV Receivers/amplifiers.
THX Ultra 2 corresponds to the earlier THX with the uncompromising design of the components.
Comparison of the three THX standards:
Front speaker
• THX Ultra 2: Angle of radiation and frequency response strictly limited requirement, D'Appolito arrangement of speaker systems prescribed.
• THX Select: More generous specifications for the angle of radiation and frequency response.
• THX Multimedia: Radiation behaviour corresponds to THX Select.
Surround speaker
• THX Ultra 2: Dipoles are compulsory.
• THX Select: Dipoles are recommended, but not compulsory.
• THX Multimedia: Direct emitters in every respect.
Subwoofer - transfer frequency
• THX Ultra 2: 80 Hz
• THX Select: 100 Hz
• THX Multimedia: 130 Hz
Volume level
• THX Ultra: Continuous load 105 dB (front) / 102 dB (surround).
• THX Select: Short term load 105 dB (front) / 102 dB (surround).
• THX Multimedia: 103 dB at the listening location/desk at approx. 50 cm distance.
Performance profile
• THX Ultra 2:
More output performance than normal AV Receivers. Complies with the strictest requirements for minor background noise and minor distortion. Is designed for the performance needs of large listening rooms up to 150 m².
• THX Select:
The structure of AV Receiver is simpler and thus more reasonably priced. Less performance required, therefore suitable for smaller and medium-sized listening rooms up to approx. 50 m².
• THX Multimedia:
Pure PC and/or multimedia speakers for use at the computer.
Speaker set-up
• THX Ultra 2: Arrangement and set-up strictly regulated.
• THX Select: Set-up and arrangement simpler and more flexible.
• THX Multimedia: Set-up of front speakers on the desk, rear speakers to the side and behind where you are sitting.
