Connect your Karaoke player or DVD player to the "DVD" or "AUX" RCA inputs.
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What are you pairing with the amplifier? What audio source are you using (TV, Karaoke machine, PC)?
Here is an assessment of how well the manual serves the user. jbl rma 220 user manual
Power on your audio sources (Karaoke player, wireless microphone receivers). Press the on the JBL RMA 220.
Achieving a professional "mix" prevents ear fatigue and makes singers sound their best. Use these baseline settings to start: Balancing Vocals and Music
Built-in professional digital echo processor with repeat and delay adjustments. Connect your Karaoke player or DVD player to
Maintain at least 10 cm (4 inches) of open space around the top, sides, and rear of the unit. Do not block the ventilation slots.
If using a wireless microphone system, connect the balanced or unbalanced audio output of the mic receiver to or MIC 5 on the rear panel. Step 4: Initial Power-On and Calibration
Here are the specifications of the JBL RMA 220: What audio source are you using (TV, Karaoke machine, PC)
: Separate volume knobs for microphones and music, featuring illuminated buttons for easy use in dark KTV rooms.
is designed to make voices sound professional, featuring specialized inputs for microphones and robust music processing capabilities. Delivers , sufficient for most karaoke speakers.
This controls vocal clarity. Leave near center (12 o'clock) or boost slightly to help the voice cut through dense backing tracks.
The RMA 220 supports RMA remote volume controls. The manual succinctly explains the daisy-chain logic for hooking up remotes via Cat5 cabling, saving the user from having to guess pinouts.