I made a video! Four of my heaviest hitters playing one after the other 
Again, I recored this with my Canon 550D which is a good cam but doesn't have high-end internal mics
So, the usual "disclaimer", the sound in the video is not representative for the real sound quality of these boomboxes.
But maybe it shows at least a little how these boxes compare to each other. Oh and don't worry, in the first half of the M90 part it's the track that doesn't thump, not the M90. In the second half of the M90 part the beat goes back to "normal". Speaking of the track, you're listening to Emil Berliner - Flummifreuden, a rather peaceful but nice one
Finished Uploading!
https://www.youtube.com/watch?v=_RyInmh6WpU

Again, I recored this with my Canon 550D which is a good cam but doesn't have high-end internal mics

So, the usual "disclaimer", the sound in the video is not representative for the real sound quality of these boomboxes.
But maybe it shows at least a little how these boxes compare to each other. Oh and don't worry, in the first half of the M90 part it's the track that doesn't thump, not the M90. In the second half of the M90 part the beat goes back to "normal". Speaking of the track, you're listening to Emil Berliner - Flummifreuden, a rather peaceful but nice one

Finished Uploading!
https://www.youtube.com/watch?v=_RyInmh6WpU