We are pleased to announce the release of a firmware update for the QSC KC12.
Please update the firmware to ensure optimal performance.

For firmware update instructions, please see here:
QSC KC12: A Step-by-Step Guide to Updating Your Firmware

Manufacturer Website
K Column Firmware Updater

Release Notes
QSC K Column Firmware Updater KC12 Version 2.0.28 (January 12, 2026)

New Features:
Support for the remote control app "QSC Loudspeaker Control"
iOS(iPhoneのみ)
Google Play
Sub-Only Mode: Selectable crossover frequencies: 80 Hz (default), 100 Hz, 120 Hz
USB-C to USB-C firmware upgrade mode
Standby disable function when connected via Bluetooth
Speaker name can be changed via the remote control app
MIX OUT GAIN: Changes occur in real time without pressing Enter to confirm

Bug Fixes:
Microphone Taper Discontinuity: Fixed an issue where the microphone taper would increase and then decrease unexpectedly when increasing the volume.
User EQ default frequencies have been changed as follows:
High Shelf Frequency: 8 kHz
EQ1 Frequency: 250 Hz
EQ2 Frequency: 2.0 kHz
Low Shelf Frequency: 100 Hz
Fixed an issue where the partial lock screen incorrectly displayed "Enter code to unlock" instead of "Enter code to lock."
Fixed an issue where recalling the default scene would not reset certain user settings.
Fixed an issue where the output level screen could freeze and display incorrect values after recalling a saved scene.
Fixed an issue where the rear panel Bluetooth LED would turn off when selecting the Bluetooth status menu.
Fixed an issue where an unintended factory reset would occur when switching to Sub-Only mode.
Fixed an issue where Bluetooth audio would be muted after recalling a default scene if Bluetooth sync tone was set to Off.
Fixed an issue where the LCD backlight would turn off when making changes using the rear panel controls.