To Next PageTo Next PageWhat to do if Infinity 7521A Amplifier has distorted audio and PROTECT LED flashes?
If your Infinity Amplifier is producing distorted audio and the PROTECT LED is flashing, it indicates a short circuit in the speaker or wire. To resolve this, remove the speaker leads one at a time to find the shorted speaker or wire, and then repair it.
Key safety advice and important notes for amplifier installation and use.
Properly connecting the amplifier's ground terminal to the vehicle chassis.
Connecting the amplifier's positive terminal to the vehicle's battery.
Connecting the amplifier's remote turn-on lead from the source unit.
Adjusting the crossover-mode switch and frequency control for optimal sound.
Understanding the FLAT, HP, and LP settings for speaker signal types.
Adjusting input gain to match source unit output and prevent distortion.
Connecting and installing an optional remote control for subwoofer level adjustment.
Enhancing bass output at 50Hz with the bass boost control.
Using full-range outputs to connect additional amplifiers.
Enhancing low-frequency reproduction with adjustable frequency and boost.
Interpreting the Clip, Power, and Protect LED indicators on the amplifier.
Diagnosing no audio when the power LED is off.
Troubleshooting DC voltage on the amplifier output.
Resolving no audio when the Protect LED is on due to voltage.
Addressing distorted audio when input sensitivity is set improperly.
Troubleshooting no audio when the Protect LED is on due to overheating.
Fixing distorted audio caused by speaker wire shorts.
Diagnosing no audio when battery voltage is too low.
Ensuring proper speaker connections for optimal bass response.
General
