4. K9 Pro indicator light description

K9 Pro uses RGB indicator light, the power is turned on, the indicator light is on.

In the digital signal input (including USB, OPT, COAX) playback state, it can indicate the current audio quality:
1. Blue ≤48khz sampling rate (K9 Pro does not support songs with a sampling rate lower than 44.1kHz)
2. Yellow>48khz sampling rate
3. Green DSD format
4. Purple MQA tracks

[Measures to deal with red light abnormality]
1. When the red light is on, it means that the temperature is higher than 70℃. At this time, K9 Pro will stop working. It is recommended to leave it for a while and try again
2. When the playback is abnormal, it is recommended to turn off the switch on the back panel and restart K9 Pro
3. For overload protection, it is recommended to unplug part of the output interface before using K9 Pro

[All RGB indicator status indications are as follows]


Working mode  No input Sampling rate ≤ 48kHz Sampling rate >48kHz DSD MQA
USB RGB indicator light circularly Blue Yellow Green Purple
Optical x
Line in RGB indicator light circularly
Mute Off
Abnormal alarm

Red indicator will stand on/pulsing/flashing when output is abnormal.

Temperature too high:  red indicator stand on
When the output is overloaded and the hardware is damaged: red indicator pulsing/flashing


  Connected with no input signal Pairing mode Reconnecting+paring mode AAC SBC LDAC APTX-HD APTX/APTX-LL APTX-Adaptive
Bluetooth receiver mode RGB indicator light circularly Red and blue light alternately Red and blue light alternately Cyan Blue White Yellow Purple Green