Issues with Sound Quality on Echo Link or Echo Link Amp

Loose or unplugged cables can cause issues with sound quality.

Check that your cables are plugged into your device and your audio system or speakers. Make sure the cables fit properly and match the port you're using.
Check that your cables work with other audio devices, if available.
Check that your speakers or audio system works with other inputs.
Make sure that your speakers, audio system, or other input devices are turned on and the volume on all devices are turned up.
Check that the correct input on the stereo system is selected.
Make sure that your Echo Link or Echo Link Amp is powered on.
Check that your Echo Link or Echo Link Amp are online and visible in the Alexa app. If your device isn't there, or shows as "offline", try setting up the device again.
Check that other devices connected to your Wi-Fi network are working. You can verify that your mic-enabled Echo device is connected by asking, "What time is it?"
Make sure that you are using supported inputs and outputs formats (for example, uncompressed PCM) with your stereo system and echo link or echo link amp.
If you're streaming over Bluetooth, try pairing your Bluetooth device again.