Disappointing sound and hardly Bass, hardly adjustment

I was 55LM620S TV in search of a sound system for my LG and have again decided therefore for the same manufacturer.
I bought an Amazon Warehouse deal for just under EUR 200. I am certainly not a sound spoiled high-end freak and thought not to make much wrong here.

The construction goes smoothly because all speaker cables are color-coded. That the system does not support HDMI ARC was known to me already from the Internet forums.
That is the sound connection to the TV must run through an optical connection cable which is not supplied and must be ordered separately.

At the first trial hearing but came directly a tough disappointment: Although the speakers are made of plastic but I did not expect that they sound so.

Just the two pronged front speakers sound like cheapest PC speaker from the supermarket Wühltisch !!
Creaking or Kratschen in language and midtones - as though the sound came through a plastic tube.

The subwoofer turns on, despite the small size of a good figure, but what's the point if one almost gets earache from the Geschnarrze from the satellite speakers.
That certainly does no one to voluntarily.

For comparison:
In the bedroom I have of the devil 5.1 System Concept E (Actually, PC speakers, purchase price under EUR 100) that although no Blu-ray player includes but from the sound worlds (!!!) is better.

Tip:
When the two front speakers, it will be replaced by higher-quality speakers bearable.
Nevertheless, it sounds not still around, let alone balanced.

What additionally disturbs is that hardly adjustment are available.
All audio settings of the TV (sound profile, treble, bass, voice enhancement Clear Voice, etc.) are automatically during operation of the sound system abgeschaltet.Die options are then grayed out and not selectable. I did not expect each other when combining two LG devices.

The adjustment limited to a few pre-defined "Sound Effect" profiles on the sound system. However, many of these predefined sound profiles switch down to the 2.1 operating - ie the sound comes only from the two front speakers and a subwoofer and there is no surround effect more. One of these profiles provides a graphic equalizer is set manually, but is down graded here on 2.1 - and is therefore unusable.
What do you want for a 5.1 system if you can then use them effectively only 3 speakers it?

The enclosed speaker cables are, of course, cheapest quality and nearly as thin as bell wire or thin USB cable (LG still advertises with 850 Watt power output).
Man is not to have bought los feel overpriced cheap junk of itself 200 EUR is not worth it.

All in all, the system is indeed visually nice to look at, but you need only once the Genkarze at the news heard then make an on hackles.