Onkyo TX-NR646 produces 160 W/channel and is equipped with the new AK4458 DAC from Asahi Kasei, providing "transparent" soundtracks. In addition to modern audio decoders, the unit has support for HDCP 2.2 for playing 4K streaming video with Dolby Atmos or DTS: X. In addition to this, the High Dynamic Range is supported. The receiver is equipped with an automatic equalizer, as well as a special connector for connecting a vinyl player. And also the manufacturer provides a flexible calibration system (AccueEQ). The device provides audio streaming via Wi-Fi, AirPlay, and Bluetooth. Spotify is also supported.
The 7.2-channel Onkyo TX-NR545 provides smooth and surround sound in games and movies, as well as powerful sound, sensitivity, and dynamic accuracy when playing music, including streaming. Between the receivers from Onkyo TX-NR646 vs Onkyo TX-NR545 comparison, there is a difference in amplifier power, it is 100 W / channel at 6 Ohms versus 115 W / channel with the same impedance. The device uses a discrete amplification system, which ensures maximum performance when using Dolby Atmos. The TX-NR545 has built-in Bluetooth and Wi-Fi receivers and supports AirPlay technology. For streaming music, there is a Spotify Connect application.
The Onkyo TX-NR545 is better receiver in this comparison. Check Onkyo TX-NR545 price