... Is phenomenal :-) Prior to purchasing the TX-NR509 served a Philips home theater system with DVD player as a 5.1 receiver. Adjacent to it was the associated Boxenset with 5 identical way speakers and a passive sub. And I actually thought that would be Dolby Surround. But what I now have with the Onkyo AVR receiver and an active Magnat 5.1 speaker set is a completely different league in comparison. The channel separation of Onkyo is absolutely clean and precise, the settings leave nothing to be desired. I especially like the on-screen function and network capability. Each input can be configured individually. Thus, the receiver automatically turns on course choice of the network in the Music PLII mode in TV mode via the HD + -SatReceiver in the Movie PLII mode in DVD and BluRay on Dolby Digital. Here, I connected all devices to the AVR, the TV performs only the HDMI output. An impairment of the image quality due to the looping through I could not find it. Since the screen (Samsung LE55C650) does not have the HDMI rear channel sound for devices that are connected to the TV (USB hard drive, cable TV ...) goes through an optical cable back to the AVR. Works without hesitation. When setting up the Onkyo AVR but was activated in the TV "AllShare" on the problem. This causes off connected devices with one or on TV. Apparently collided this function with the HDMI control of the AVR. Solution: Turn off AllShare, runs perfectly. The allocation of sound channel to HDMI channel is a bit confusing if you want to use separate signals for picture and sound. The main thing is that you choose for each HDMI channel any audio source and can also synchronize individually as needed. The remote control has been so often been criticized in Onkyo receivers - in my opinion rightly so. There namely relatively complicated double occupancy of certain keys. If you select an input source (eg BD / DVD) and would then once briefly look up something in the main menu of the AVR, the Setup button is not working. Only when Mn pushes the receiver button beforehand, you can select Setup. Then, however, the device control will not work until you once the input channel (in the example "BD / DVD") suppressed. The nonsense I could eliminate fortunately a Logitech Harmony FB. Switchover delays, cracking when changing channels or volume unpleasant surprises when changing the audio source does not exist. The network function is a real asset, only the overly simple graphical representation via OSD leaves to be desired. The establishment of the DLNA server efordert be patient. But this is less due to the Onkyo as the release Einstelungen in Windows. Without appropriate (music) libraries on the PC seems not to run. The function, quasi remotely play a file on the AVR within Windows has not yet tapped me. Although when you right click on an MP3 file in Explorer the option "Playback via TX-NR509" exists, is no sound and Windows reports "TX-NR509" not responding. Conversely, I can select any music file on the PC / netbooks on the AVR and play, provided that it is integrated into the Windows Library. The Internet Radio convinced there can also be explicitly searched for artist and genre and relevant title is transferred in absolutely impeccable quality - that is real progress, since it does not rely on simplistic streamed radio broadcasts. A normal station selection is of course also possible to use almost all conventional stations offer parallel to the receiver via the Internet. All in all I am very pleased with the acquisition, the extra cost compared to the smaller 309er model is more than justified by the extra features that you probably should not say on the added price for 609er model. So if, like me, with 5-channel sound is happy and no need for 7.1 has, with this receiver can not go wrong.