The RightMark Audio Analyzer suite is designed for testing quality of analog and digital paths of any audio devices, be it a sound card, an MP3 player, a consumer CD/DVD player or an acoustic set. The results are obtained by playing and recording test signals passed through the tested audio path by means of frequency analysis algorithms. The latest version of RightMark Audio Analyzer can be found here.
The audio performance numbers according to Rightmark Audio Analyzer show that the two ASUS Republic of Gamers motherboards have very comparable performance. The only area that shows a significant difference is the Dynamic Range. The ASUS Maximus IV Extreme-Z had a dynamic range of 41.8 and a rating of Very Good while the ASUS Maximus IV Gene-Z had a dynamic range of 85.3 and a rating of Good.