Samson R5A Rubicon Active Studio MonitorsNotes Fully functional monitors require a balanced signal to the 1 4" input jacks for proper operation by design. TRS cables required, basically. Standard TS instrument cables produce a loud buzzing without proper signal flow. A Samson R5A Rubicon Active Studio Monitors in Very Good condition! At Evolution Music, we attempt to highlight cosmetic defects (if any) by picturing every angle of every piece of gear so you know exactly what you are getting.