Amazon Limits Voice Control for AUX on Older Echo Devices

Changes to Echo Functionality
Amazon has implemented an unexpected update for owners of older-generation Echo speakers. The company has officially confirmed that it no longer supports voice commands related to managing AUX (line-in) inputs. Users who previously relied on commands such as "Alexa, play from line in" or "Alexa, set AUX input" to activate wired audio sources will no longer be able to use this feature.
The change affects several specific Echo models: the 2018 second-generation Echo Plus, the 2019 third-generation Echo, the 2019 first-generation Echo Studio, and the 2020 fourth-generation Echo. According to an Amazon representative, the company has already notified the small number of users who frequently used voice commands to switch the AUX mode. However, the official reason for the removal of this feature remains unknown.
How to Continue Using Your Devices
It is important to note that the physical 3.5mm jack and wired connection remain fully functional. Amazon has only restricted the ability of the voice assistant to control this port. If you use an older Echo speaker to connect to external audio equipment, such as older CD players or computers, this remains possible.

To manage the AUX input, you must now use the Alexa mobile app. To do this, select your speaker in the app, navigate to the settings (Devices > Settings), find AUX Audio, and manually select the "Line In" mode. You can also manage models that support both input and output signals through the app.
What This Means for Users
This change serves as a reminder that smart home technology manufacturers often limit the capabilities of older hardware through software updates. If you still own an Echo model with an AUX port, replacing it is not necessary, as the physical connection still works. However, it is worth noting that you are unlikely to find this port on newer devices.
For users who frequently integrate older audio systems into their smart home ecosystem via Echo, this change may cause some inconvenience. Although voice control was more convenient, using the application remains a reliable alternative. Most importantly, there is no need to rush to replace your device if it still fully meets your audio needs.