These loudspeaker boxes have been in use as a "secondary system" in my study for years. Again and again I notice how balanced the sound is - especially recognizable in classical music: low mid / midrange extremely natural. The basses are remarkably good for the size of the speakers (only 9 cm deep). The treble range is neither aggressive nor flat.
Surely the natural sound effect is partly responsible for the very heavy construction of the additional center bar, which firmly connects the front and back again.
In addition, a relatively large amount of sound comes out of little electrical power.
Whoever buys these boxes as a bargain does nothing wrong.