TABLE OF CONTENTS

The WiiM Amp Ultra features three distinct audio input ports: 

  • Line In
  • Optical In
  • HDMI ARC


You can connect devices like CD players, TVs, PCs, or turntables, to your WiiM Amp Ultra via these input ports for high-quality playback with reduced latency.

Supported Audio Format and Quality for HDMI ARC and Optical In


The following table shows the supported audio formats and quality for the HDMI ARC and Optical In ports on the WiiM Amp Ultra:


PortsSupported Audio FormatsSupported Audio Quality
HDMI ARCPCM, Dolby DigitalUp to 24-bit/192 kHz
Optical InPCM, Dolby DigitalUp to 24-bit/192 kHz



The WiiM Amp Ultra does not support Dolby Atmos or DTS audio formats.

How to Use the Line In Port


The Line In port on the WiiM Amp Ultra is typically used to connect a CD player, a turntable with a built-in preamp, or a PC to receive analog audio input. 


This example shows how to use the Line In port to connect a CD player:


  1. Use a RCA cable to connect the Line In port on your WiiM Amp Ultra to the Line Out port on a CD player.
  2. Set the WiiM Amp Ultra's source input to Line In. For details, see How to Select Audio Input.

  3. Play music on the CD player. The music will stream to your WiiM Amp Ultra.


Similarly, you can connect other audio device to your WiiM Amp Ultra via the Line In port in the same process.

How to Use the Optical In Port


The Optical In port on the WiiM Amp Ultra is typically used to connect to a TV or PC to receive digital audio input.


This example shows how to use the Optical In port to connect a TV:

  1. Use an optical cable to connect the Optical In port on your WiiM device to the Optical Out port on a TV.
  2. Go to the TV settings, set your TV's audio output to select your WiiM Amp Ultra.

  3. Set the WiiM Amp Ultra's source input to Optical In. For details, see How to Select Audio Input.

  4. The audio on the TV will play on your WiiM Amp Ultra.


Similarly, you can connect other audio device to your WiiM Amp Ultra via the Optical In port in the same process.

How to Use the HDMI ARC Port


The HDMI ARC port on the WiiM Amp Ultra is typically used to connect to a TV or PC to receive digital audio input.


This example shows how to use the HDMI ARC port to connect a TV:

  1. Use an HDMI cable to connect the HDMI ARC port on your WiiM Amp Ultra to the HDMI ARC port on your TV.

    Note: ensure you use the HDMI ARC port on your TV. Other HDMI ports won’t transmit sound to the WiiM devices.

  2. Go to the TV settings, enable the HDMI ARC function and set your TV's audio output to select your WiiM Amp Ultra.

  3. Set the WiiM Amp Ultra's source input to HDMI ARC. For details, see How to Select Audio Input.

  4. The audio on the TV will play on your WiiM Amp Ultra.


Similarly, you can connect other audio device to your WiiM Amp Ultra via the HDMI ARC port in the same process.


If you encounter no sound issues with your TV, refer to HDMI ARC Troubleshooting. 

How to Use Audio Input Ports with Multi-room


The WiiM Amp Ultra supports all its audio inputs—Wi-Fi/Ethernet, Bluetooth, Line In, Optical In, and HDMI ARC—as sources for your multi-room audio system. By connecting an audio source device (e.g., a CD player, a turntable or a TV) to your WiiM Amp Ultra, you can stream audio to any other WiiM devices on the same network.


For detailed instructions, refer to the following articles:

How to Select Audio Input


Automatically Select Audio Input using Auto-Sensing


The auto-sensing feature allows the WiiM Amp Ultra automatically play audio from the connected input when a signal is detected.


To enable auto-sensing, follow these steps:

  1. Open the WiiM Home App.

  2. Navigate to the Devices tab.

  3. Tap the Device Settings icon of your WiiM device.

  4. Select Audio Input and enable Auto-Sensing of Optical In, HDMI, and Line In.


By enabling auto-sensing, your WiiM device will automatically switch to the active audio input, offering a seamless and convenient listening experience.


When your WiiM device is streaming music from a Wi-Fi source, the auto-sensing feature is inactive and will not switch to other inputs such as, Line In, Optical In, or HDMI ARC.


Manually Select Audio Input


You can also manually select the desired audio input on your WiiM Amp Ultra in the following ways.


  • Method 1: From Audio Input in Devices Settings of the WiiM Home App

  • Method 2: From the Source Input section in the Browse tab of the WiiM Home App
  • Method 3: Using WiiM Amp Ultra's Screen

  • Method 4: Pressing the Button on the WiiM Voice Remote 2

Edit Input Sources


To make switching between input sources more convenient, you can manage which sources are visible—keeping your most frequently used inputs easy to access. 


For detailed instructions, see Manage Input Sources in the WiiM Home App’s Browse Tab.

HDMI ARC Troubleshooting


  • When connecting your TV to your WiiM Amp Ultra via an HDMI cable, ensure you use the HDMI ARC port on your TV or Blu-ray player. Other HDMI ports won’t transmit sound to the WiiM devices.

  • If you experience no sound, ensure that the HDMI ARC output on your TV is activated. For details, see Troubleshooting No Sound Issues with HDMI TV Input on WiiM Devices.

  • If there are control issues between your TV and your WiiM Amp Ultra, verify that HDMI-CEC control is enabled on your TV.

  • If your TV lacks an HDMI ARC port, connect the Optical Out port of your TV to the Optical In port of your WiiM Amp Ultra.