Sound too thin, no volume, never as 50W power supply 27W only makes!

Sound too thin, no volume, never as 50W power supply 27W only makes!
How can this system 50W RMS afford when the power supply provides only 27W.
Less 15% dissipation of the Amp and have gained 15% of the NT arise because
maximum 20W, so 10W max per speaker.
And since I have a lot expected too optimistic.
Just as thin then sounds the sound.
Depth middle or even basses do not exist unfortunately.
Also the sound starts to pump at when you turn the volume times.
The sound is then even thinner because then even more only the highs come through.
For me insufficient overall.
But the system looks good and is well made that we have on the plus side.