The WiiM Pro and WiiM Pro Plus feature two distinct audio input ports:

  • Line In
  • Optical In

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

Supported Audio Format and Quality for Optical In

The following table shows the supported audio formats and quality for the Optical In port on both the WiiM Pro and WiiM Pro Plus:

DevicePortsSupported Audio FormatsSupported Audio Quality
WiiM ProOptical InStereo PCMUp to 24-bit/192 kHz
WiiM Pro PlusOptical InStereo PCMUp to 24-bit/192 kHz

Please note that neither the WiiM Pro nor the WiiM Pro Plus supports other TV audio formats like Dolby Digital, Dolby Atmos, or DTS.

To ensure proper sound output and compatibility, set the audio format to Stereo PCM in your TV or Blu-ray player's settings when using the WiiM Pro or WiiM Pro Plus.

How to Use the Line In Port

The Line In interface on the WiiM Pro and WiiM Pro Plus is typically used to connect to a CD player or PC to receive analog audio input.

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

  1. Use an RCA cable to connect the Line In port on your WiiM Pro or WiiM Pro Plus to the Line Out port on a CD player.
  2. Select the source input as Line In in the WiiM Home app, or enable Auto-sensing of Line In. For details, see How to Select Audio Input.
  3. Play music on the CD player. The music will stream to your WiiM Pro or WiiM Pro Plus.

Similarly, you can connect other audio devices to your WiiM Pro or WiiM Pro Plus via the Line In port in the same process.

How to Use the Optical In Port

The Optical In port on the WiiM Pro and WiiM Pro Plus is typically used to connect to a TV, CD player, 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 Pro or WiiM Pro Plus.
  3. Set the TV's digital output audio format to the Stereo PCM format. For instructions, refer to General Guide to Setting Digital Audio Output to PCM for Various TV Brands.
    Note: When using the Stereo PCM format, if your TV has a Digital Audio Out Volume setting (or a similar option), make sure to set it to Max. Otherwise, the connected WiiM device may output very low or no sound.
  4. Select the source input as Optical In in the WiiM Home app, or enable Auto-sensing of Optical In. For details, see How to Select Audio Input.
  5. The audio on the TV will play on your WiiM Pro or WiiM Pro Plus.

Similarly, you can connect other audio devices to your WiiM Pro or WiiM Pro Plus via the Optical In port in the same process.

How to Use Audio Input Ports with Multi-room

The WiiM Pro and WiiM Pro Plus feature all its audio inputs—Wi-Fi/Ethernet, Bluetooth, Line In, and Optical In—as sources for your multi-room system. By connecting an audio source device (e.g., a CD player or TV) to your WiiM Pro or WiiM Pro Plus, 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 your WiiM Pro or WiiM Pro Plus to 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 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.

Note: Auto-sensing works only when your WiiM device isn't playing audio from the current input source. For example, if your WiiM device is playing music over Wi-Fi and you start audio on Line In or Optical In, it won't automatically switch to that input.

Manually Select Audio Input

You can also manually select the desired audio input on your WiiM Pro or WiiM Pro Plus in the following ways.

  • Method 1: From Audio Input in Device Settings of the WiiM Home App
  • Method 2: From the Source Input section in the Browse tab of the WiiM Home App
  • Method 3: Pressing the  Button on the WiiM Voice Remote

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.