The Monacor would do better than the Vistaton in a sealed enclosure of that size. But as leaky as the box is, they might end up the same.
Try some cliff richard and elvis songs from the 60s. They actually sound better than a modern system, with the bass and treble missing, you are just focusing on the voice... the rest of the instruments are too distracting in modern systems.Yeah, maybe something like that.
In the meanwhile, I am gladly using it to listen to some old tunes, the old speaker sounds pretty "vintage".
Here is the radio working Shared album - Daniel Spillere Andrade - Google Photos
Sound coming from a Raspberry Pi with Spotify Connect 😀
Oon