Unfortunately, my Flat-TV insufficient speakers (not to say dam ...). Music and especially concerts etc. hear from the speakers of my TV to atrocious. Had it once tried to tinker with the sound with a so-called Lautsprecherbar, I did not find it particularly Doll what was coming. Somehow it did not sound like I had imagined / desired. I just finally decided to buy an amplifier. When price-performance comparison STR-DH520'm then stuck at Sony. The decisive factor, in addition to the low price, the Sony STR-DH520 4 HDMI inputs and instead 5.1 already has the 7.1 Lautsprechersytem. Although I now only 4 speakers plus sub. drann have (but who knows maybe I expand soon) The information that the Vertärker 3 D is capable convinced me. Well, probably it is not the ultimate, but just right for my needs durchschittlichen. Sure amplifiers are the most cost tens of times, can afford more, but in my normal apartment I would greater and more expensive amplifiers can extend at all. My Blu-ray player and my Internet radio as well as my pay-tv I could connect well and the devices are optimally processed by Sony STR-DH520 thanks to 4 HDMI inputs. I am happy. My speakers have can be connected well and I am fully satisfied with the sound.