The Onkyo HT-S7409 combines a TX-NR609 7.2 channel THX-Select2 Plus Certified home theater receiver
with four bookshelf satellite speakers, a compact center channel speaker, and one 10-inch 120-watt subwoofer, for a 5.1 channel home theater system configuration out of the box, but you also have the option of adding two additional speakers, and a second subwoofer, if you desire a 7.2 channel configuration.
This system also features comprehensive Dolby and DTS decoding as well as Dolby Pro Logic IIz processing. There are six 3D compatible HDMI inputs and support for both 1080p and 4K upscaling. In addition, access to internet radio and music services are provided, such as vTuner, Pandora, Spotify, and Rhapsody.
For less than $800, this system is a great value, especially if you are looking for something that has some degree of expandability.
For additional suggestions, check out my list of Home Theater-in-a-Box Systems.
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