en....an easy way to do Bluetooth, especially if your boombox has no line in but I would go with a dongle that plugs into the Line In as the sound would be somewhat cleaner & have a better dynamic range since you don't have to convert the signal into a magnetic output for the playhead to pick up. Just my thoughts but hey, if you have no line in & don't want to mess around inside, this may be your only option....
Cpl