What to do if Infinity 1211a 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.
What does it mean if PROTECT LED is on on my Infinity Amplifier?
If the PROTECT LED is illuminated on your Infinity Amplifier, it means the amplifier is overheated. Ensure that the amplifier's cooling is not blocked at its mounting location. Also, verify that the speaker-system impedance is within the specified limits.
What to do if my Infinity 1211a has no audio and PROTECT and POWER LEDs flash?
If your Infinity Amplifier has no audio and both the PROTECT and POWER LEDs are flashing, the voltage on the BATT+ connection is less than 9V. Check the vehicle's charging system to resolve this issue.
What to do if my Infinity 1211a Amplifier has no audio and PROTECT LED is on?
If your Infinity Amplifier has no audio and the PROTECT LED is on, it indicates that the voltage on the BATT+ connection is greater than 16V or less than 8.5V. You should check the vehicle charging system.
What to do if my Infinity 1211a Amplifier has no audio and PROTECT LED flashes every 4 seconds?
If your Infinity Amplifier has no audio and the PROTECT LED flashes every 4 seconds, it indicates DC voltage on the amplifier output. The amplifier may need service; see enclosed warranty card for service information.
Essential safety precautions and tips for installing the amplifier.
Guidance on choosing a suitable location and mounting the amplifier securely.
Details on power, ground, remote, speaker, and high-level connections.
Diagrams for connecting one or two subwoofers for these amplifier models.
Setup diagrams for stereo and bridged-mono operation of the 7521a amplifier.
Setup diagrams for 4-channel stereo, 3-channel, and bridged 2-channel modes.
Diagrams for 6-channel, 5-channel, and 3-channel operation of the 5761a amplifier.
How to adjust crossover frequency, mode, and input sensitivity for optimal sound.
Information on optional remote control, bass boost, and auxiliary outputs.
Using DBO for bass enhancement and understanding amplifier status LEDs.
Diagnosing and resolving common audio problems and LED indicators.
Addressing distorted audio and issues with music sounding weak or lacking impact.
Detailed technical specifications for all Reference Series amplifier models.
General| Channels | 2 |
|---|---|
| Signal to Noise Ratio | >80dB |
| Input Voltage | 14.4V |
| Input Impedance | 10k Ohms |
| Frequency Response | 10Hz |
| Input Sensitivity | 200mV |
| Damping Factor | >100 |
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