There is no widely recognized JBL product with the exact model number "RMA 220" . It is highly probable that you are referring to one of the following two products, as the model number "220" is prominent in their naming conventions:
Before diving into the manual, verify your package contains: jbl rma 220 user manual NEW%21
: 11-step digital key controller (±5 levels) to match musical pitch to your vocal range. Equalization : 3-band EQ for microphones and 2-band EQ for music. Setup & Operation Basics Microphone Connection Important Clarification: There is no widely recognized JBL
To keep your running for a decade:
The power came back an hour later. The house roared to life. The RMA’s orange light flickered, then steadied. jbl rma 220 user manual NEW%21