DUAL 15 FEATURES AND TECHNICAL SPECIFICATIONS 4 RU 8 RU 8 RU 15.5” DR847 15-21” DR800 Dim. A: 36.0” 7 RU 15-21” Dim. A: 42.75” The "original" rack module with a total of 12 RU spaces on the front plus 7 more on the back. Mastering module designed with angled top to defeat early reflections from speakers. Total 8 RU spaces. 8 RU 5 RU 3 RU 3 RU 22.0" 6 RU 15-21” Dim. A: 36.0” Dim. A: 41.0” Low profile module with enough flat space on top to place near-field speakers.