I purchased this latest-model Denon AVR-X4100W receiver from B&H Photo for a promotional $999 in December of 2014. This is one of the very few receivers on the market that support the new Dolby Atmos audio format which obsoletes the old 5.1 or 7.1 Dolby systems. This is a 7 channel receiver with 125 W/channel. It supports 4K content @ 60hz with 4:4:4 subsampling and has both wireless and Bluetooth connectivity. Perhaps one of the best features is that it uses the Audyssey XT32 Pro room correction system with up to 32 measuring points and 512 filter points.
The reason I'm selling it is because I decided to move to a 9-channel Dolby Atmos system with 4 height channels and now I need the more expensive X5200W model. As you can see the box is still completely sealed. I do have the option of sending it back to B&H for a full refund but I need to pay the shipping. I'd much rather sell this to one of my AV brethren for the $999 price I bought it at since it is now selling for hundreds more at $1199 at B&H, win-win for both of us. Word to the wise, when buying a new receiver online, make sure it is from an authorized dealer otherwise Denon will not honor the warranty; B&H Photo *is* such an authorized dealer and thus this will be fully under warranty, I will include the invoice as well.
See this link for full specs: http://usa.denon.com/us/product/HomeTheater/AVReceiversHT/AVRX4100W
See this link for retail price: http://www.bhphotovideo.com/c/product/1075690-REG/denon_avr_x4100w_7_2_channel_4k_ultra.html
=== Be sure to check out my KEF Q-series speakers for sale: http://www.avsforum.com/forum/209-audio-gear/1929753-fs-kef-q200c-q100-bookshelfs-cherrywood.html ===