ASUS Prepares Xonar Essence STX, the World's First Audio Card to Achieve 124dB SNR | TechPowerUp
How to Configure Asus Essence STX II 7.1 PCI-E Soundcard as an Active Stereo Crossover for 3 Way Speakers | Headphone Reviews and Discussion - Head-Fi.org
ASUS Essence STX II 24-Bit 192KHz PCI Express X1 Sound Card 801940483034 | eBay
ASUS Xonar Essence STX soundcard - diyAudio
ASUS Xonar Essence STX II | Page 43 | Headphone Reviews and Discussion - Head-Fi.org