What is the difference between SRS TruSurround HD and SRS TruSurround XT?

The new evolution mode of SRS TruSurround XT developed by American SRS Labs, Inc.: virtual surround SRS TruSurround HD/HD4 and focusing function;

Equipped with SRS TruSurround HD/HD4 to reproduce high-quality stereo space-

Compared with the previous SRS TruSurround XT, the SRS TruSurround HD equipped with NJU26040-09D has the function of emphasizing the clarity of treble. The built-in SRS TruBass enhances the bass effect, and the clarity function can realize the virtual surround of broadband by modifying the treble. In addition, compared with SRS TruSurround XT which uses two speakers to obtain surround effect, TruSurround HD4 puts front stereo speakers and rear stereo speakers together in front, and consists of a 4Ch amplifier and four speakers. Compared with SRS TruSurround XT, the surround sound effect has been improved by leaps and bounds, and a higher stereo space can be reproduced.