good sound despite a lack of quality

I bought this 5.1 system in December 2010. The sound is real hammer our 28m²-living room. Ever since I was very excited.
On the day exactly 4 years later, in December 2014, the system no longer made a peep. Tried everything else and came to the conclusion that all audio outputs are dead. So I sat down with the service of the devil (grottenschlecht !!!) apart. I could send the device in for free, and after 3 weeks was the same result for Devil firmly. Unfortunately, they could not fix my receiver because there allegedly no more spare parts for the appliance. But it would give me a 10% discount on the successor. I let me return the receiver and an expert examined him. The power supply's fault because it causing such a "hum" that partially an important chip failures inside. In Internet well signposted hundreds owner of this device the same mistake. Even when researching struck me once that all components come from China and the final product is Made in Germany.

Therefore my judgment: Stay away from cheap Teufel products and lousy service!