If your variant includes DSP, hold the power button for 10 seconds while applying AC power. The LEDs will flash three times to confirm all settings returned to default. Section 7: Maintenance & Firmware Updates The JBL RMA 220 is a fanless unit (in most configurations), which means it relies on passive cooling.
Introduction: Why This Manual Matters
Last updated: October 2025 – reflects the latest JBL Professional service bulletins. jbl rma 220 user manual