It’s strongly recommended to compare different receivers if you want to choose the best one: Onkyo TX-NR646 vs Onkyo TX-NR656.
AV receivers under review have the same number of channels. In terms of power, the receivers have the same performance - 160/6 1KHz. A common feature for devices is the same total harmonic distortion - 0.08%.
Competitive models use the same DAC. Each of the compared opponents supports Bi-amping. Both Onkyo TX-NR646 and Onkyo TX-NR656 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Wireless Internet access via WIFI is possible on both units. Each of the receivers has a Bluetooth connector. Both devices can work with such Apple Music services: AirPlay. Access to the Spotify service is on each of the competitors. Most popular streaming services are available for our models under consideration - Deezer, TuneIn Radio.
Support for the HDR function can only boast of each of the AV receivers. The quality of 4K 60p signal remains unchanged when transmitting from a source to a TV or projector via HDMI for both receivers. Signaling over HDMI in standby mode can provide the TX-NR646 and the TX-NR656. Video scaling is only possible with the TX-NR656. Review participants do not have the Dolby Vision feature.
The number of HDMI inputs/outputs is the same - 8/2. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the TX-NR646 and the TX-NR656. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. TX-NR646 and TX-NR656 support the standard HDCP 2.2. Like most receivers, our models have a built-in phono stage for connecting a vinyl player.
Ability to create 2 Multi zones inherent in both AV receivers. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in TX-NR646. The Onkyo TX-NR646 and the Onkyo TX-NR656 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available both models. A DTS:X surround technology is supported by devices from our comparison.
The Onkyo TX-NR646 is better receiver in this comparison. Check Onkyo TX-NR646 price