Please be well noted that Spotify music can be played on Spotify app only due to DRM protection. If you would like to convert them to Luxman amp, you need to use a third-party software, such as Spotify Playlist Downloader for Mac, which can download Spotify files as MP3 so you can transfer them to other devices.
By the way, it works on free Spotify account also. So please don’t worry about subscribing Spotify Premium.
By the way, it works on free Spotify account also. So please don’t worry about subscribing Spotify Premium.