A receiver is one of the most important components of a theater system and you don't want to compromise on one. Yamaha's AVENTAGE series has gifted us with magnificent receivers and it is our favorite line ever. There is something for every taste, and every budget. You can't go wrong with any of these models, it basically boils down to the features you're looking for.
This top rated series represents a dramatic, inspired leap forward with best in class audio/video component design. Sensational and clean, crisp sound and video. Studio grade sound and sophisticated video enhancements are brought into your him with unparalleled attention to detail in design, engineering and fabrication. Every electrical path, part and piece was rethought and redesigned to achieve total performance excellence for every one of AVENTAGE's receivers. They are finest available for maximum performance. A work of visual and acoustic art indeed.
RX-A550 5.1 channel. This has the lowest price point and, even though it's their base model, quality premium facial aluminum fronts and great features are all included. 4K UHD passthrough compliance with HDCP 2.2, wireless Bluetooth and Wi-Fi with AirpPlay and Wireless Direct, on-board Spotify and Pandora and playback of high-resolution files DSD(2.6 MHz / 5.6MHz) and PCM WAV files FLAC and AIFF are also part of the deal. The receiver is also compatible with the Yamaha controller applications and YPAO automatic correction settings / room.
RX-A750 7.2 channel. Upgrading to the A7550 provides additional benefits, including the next two surround channels and support for this second subwoofer you already have an eye on, and support for Yamaha YPAO Reflected Sound Control, which deals with reflections Room for better optimization of the room. In addition to 4K UHD passthrough, A7550 offers support for HDR(High Dynamic Range) video signals that allow for unparalleled contrast between light and dark scenes, creating a richer picture of the upcoming HDR equipped with 4K UHD TVs. This receiver feature will help grow content and video equipment 4K UHD future.
RX-A8550 7.2 channel. Moving to the A8550 provides more sophisticated optimization, and YPAO – RSC for better sound optimization in any listening position. That should be helpful as A8550 is their lowest priced receiver with Dolby Atmos decoding, which allows not only for more accurate identification of “objects” surround sound content mixed in Dolby Atmos, but also allows two channels to be redirected to standing speakers, which reflect sound from the ceiling or overhead speakers designed from the top down to create a more immersive sound.
RX-A1050 7.2 channel. Dolby Atmos is an excellent addition to the Aventage family. However, if you are looking for even more versatility, you might be interested in stepping up to the A1050. The A1050 is AVENTAGE's most affordable receiver compatible with DTS’ answer to Dolby Atmos, DTS:X. The A1050 is equipped for any surround sound mix and it also allows for HDMI multi-zone switching to send video and audio to a separate room. This is one awesome receiver, and it's not for the weak of heart. Only the truest connoisseurs will appreciate this baby.
RX-A3040 RX-A2050 9.2 channel. Here's where Yamaha really starts to bring out the big guns, allowing multiple Atmos Dobly and DTS: X configurations, including four ceiling speakers complement the regular 5.2 surround sound settings. The receiver also uses dual ESS Sabre DAC Premiere Technology for high quality digital audio conversion, which should greatly benefit stereo music listeners.
RX-A3050 9.2 channel. Finally, at the top of the stack is the Yamaha RX-A3050 flagship. This beauty wins the award with its elite features, including dual 192kHz / 32bit Sabre32 chips Ultra DAC main seven channels, and Sabre Premiere channels for presence, as well as pre-outs expansion for up to 11 2 channels up and optimization peace Yamaha YPAO RSC get everything locked down to the millimeter.
http://usa.yamaha.com/products/audio-visual/aventage/
RX-A550 5.1 channel. This has the lowest price point and, even though it's their base model, quality premium facial aluminum fronts and great features are all included. 4K UHD passthrough compliance with HDCP 2.2, wireless Bluetooth and Wi-Fi with AirpPlay and Wireless Direct, on-board Spotify and Pandora and playback of high-resolution files DSD(2.6 MHz / 5.6MHz) and PCM WAV files FLAC and AIFF are also part of the deal. The receiver is also compatible with the Yamaha controller applications and YPAO automatic correction settings / room.
RX-A750 7.2 channel. Upgrading to the A7550 provides additional benefits, including the next two surround channels and support for this second subwoofer you already have an eye on, and support for Yamaha YPAO Reflected Sound Control, which deals with reflections Room for better optimization of the room. In addition to 4K UHD passthrough, A7550 offers support for HDR(High Dynamic Range) video signals that allow for unparalleled contrast between light and dark scenes, creating a richer picture of the upcoming HDR equipped with 4K UHD TVs. This receiver feature will help grow content and video equipment 4K UHD future. RX-A8550 7.2 channel. Moving to the A8550 provides more sophisticated optimization, and YPAO – RSC for better sound optimization in any listening position. That should be helpful as A8550 is their lowest priced receiver with Dolby Atmos decoding, which allows not only for more accurate identification of “objects” surround sound content mixed in Dolby Atmos, but also allows two channels to be redirected to standing speakers, which reflect sound from the ceiling or overhead speakers designed from the top down to create a more immersive sound. 
RX-A1050 7.2 channel. Dolby Atmos is an excellent addition to the Aventage family. However, if you are looking for even more versatility, you might be interested in stepping up to the A1050. The A1050 is AVENTAGE's most affordable receiver compatible with DTS’ answer to Dolby Atmos, DTS:X. The A1050 is equipped for any surround sound mix and it also allows for HDMI multi-zone switching to send video and audio to a separate room. This is one awesome receiver, and it's not for the weak of heart. Only the truest connoisseurs will appreciate this baby.
RX-A3040 RX-A2050 9.2 channel. Here's where Yamaha really starts to bring out the big guns, allowing multiple Atmos Dobly and DTS: X configurations, including four ceiling speakers complement the regular 5.2 surround sound settings. The receiver also uses dual ESS Sabre DAC Premiere Technology for high quality digital audio conversion, which should greatly benefit stereo music listeners.
RX-A3050 9.2 channel. Finally, at the top of the stack is the Yamaha RX-A3050 flagship. This beauty wins the award with its elite features, including dual 192kHz / 32bit Sabre32 chips Ultra DAC main seven channels, and Sabre Premiere channels for presence, as well as pre-outs expansion for up to 11 2 channels up and optimization peace Yamaha YPAO RSC get everything locked down to the millimeter.
http://usa.yamaha.com/products/audio-visual/aventage/