Error | Protect Mode 4 on K.2 Series loudspeakers

Learn how to activate and use Protect Mode 4 to protect against errors and improve the status of your system.

Updated at June 5th, 2024

Message

THE MESSAGE:  “PROTECT MODE 4” | “POSSIBLE SPEAKER DAMAGE DETECTED.” | “NEXT”


Causes

The PROTECT MODE 4 message can appear during operation.  This indicates that the firmware has detected a potential issue.  If this occurs, audio will stop and the listed procedure will be needed to clear the message.  

If the message appears repeatedly during operation, the speaker will need to be sent to a QSC Authorized Service Center for evaluation. 


Definition

“Protect Mode 4” is a message that may show up after a successful firmware update of the K.2 Series speaker. This message is indicating that the amp module is sensing a performance issue on the low frequency driver. If this message appears, follow the listed instructions shown below.


 

Solution | Workaround

  1. Press “NEXT” to navigate to the next step.
  2. NEW MESSAGE = “PROTECT MODE 4” | “A 100HZ TONE WILL BE PLAYED” | “NEXT” 

  1. Press “NEXT” to engage the test tone.
  2. NEW MESSAGE = “IS TONE CLEAR AND UNDISTORTED?” | “YES” or “NO” 

  1. Listen and confirm if the tone is clear:

Click along the next steps based on your speaker's responses:

Press “Yes” if the audio is clear and sounds like a pure sine wave.

Press “No” if the audio has distortion or is NOT CLEAR.

Yes

 

No

 
 

The LCD will display a new message:    NEW MESSAGE = “PROTECT MODE 4” | “SPEAKER IS OKAY” | “EXIT”

Press Exit

 
 

Press “EXIT” and the speaker will go back to the “Home” screen and resume normal operation.

 
 

The LCD will display a new message:     NEW MESSAGE = “PROTECT MODE 4” | “PLEASE CONTACT A QSC SERVICE CENTER” 

Contact QSC Service Center

 
 

This indicates that there is already damage on the low frequency driver and that the speaker will need to be sent to a QSC Authorized Service Center for further inspection. You may also Click Here to create a case with QSC Support.

 
 

Note

If “NO” was pressed accidentally and the tone was in fact clear, power cycle the speaker and the PROTECT MODE 4 message will start over again. Proceed through the test again to confirm that the tone is clear.

 

In all instances should the error persist, there is a hardware issue occurring that will require repair with a QSC Authorized Service Center. It is recommended to stop using the speaker to avoid potential further damage.