DTS partnered with UMe to include a 11.1 surround sound DTS Headphone:X mix of the album, which they say allows fans to hear the music as if they were sitting in the producer's chair in the studio with the band.

This will be the first rock album released using a 11.1 DTS Headphone:X mix. Fans will access the mix via the 'Soundgarden DTS Headphone:X Superunknown 20th Anniversary Super Deluxe Edition' app on iOS and Android devices.

Fans can listen to an online sample to get an idea of the difference in sound produced using DTS Headphone:X. Grab you headphones and listen to the mix of 'Spoonman' here.

Producer and engineer Adam Kasper had this to say, "Bands have been releasing albums in surround sound for years now, but no technology has been able to provide fans with a true feeling of what it was like to be in the studio with the band.

"That's why I find DTS' Headphone:X technology so fascinating. The experience Soundgarden's fans will hear over headphones is identical to how I heard the mix in the studio when producing the surround sound version."