THX Ultra II Plus: The most demanding innovations in terms of design THX Ultra 2 standard lies in its considerably more stringent requirements for the maximum that can be achieved without distortion dynamics the front speaker. The most significant difference in playback quality between THX Ultra and THX Ultra 2 relates to this dispersion characteristics of the loudspeaker, its high-frequency response and the linearity of the overall frequency response.
It was the goal that HiFi- or to optimize music playback properties. According to the THX Ultra 2 standard, it is for the perfect Connection at Subwoofer necessary cutoff frequency been determined at 80 Hz (-3dB). When using a subwoofer, it makes no sense to reproduce lower frequencies via the rear loudspeakers, as this would lead to an unnecessary enlargement of the housing.