- Verify that the volume is not muted or set to 0.
- Verify the mode (AirPlay Wireless or iPod mode).
- Verify iPad, iPhone or iPod is properly docked with the 30-pin connector.
- Verify that there is not another iTunes library or iOS device connected to the iW4 speaker.
- Check the network connection. Set up the network again if needed.
- Try restarting iTunes or your iOS device.