The Onkyo TX-NR646 vs Onkyo TX-SR343 comparison will be extremely helpful for people who want to get a great, powerful receiver with many functions.
The number of channels for receivers is different - 7.2 versus 5.1, respectively, for devices. In terms of power, there are differences, the TX-NR646 has such a ratio W/Ohm - 160/6, while the TX-SR343 has a power of 100/6. A common feature for devices is the same total harmonic distortion - 0.08%.
The manufacturer installed different DACs, the TX-NR646 received the model Hi-Grade 384 KHz/32-bit, but the TX-SR343 is equipped with TI Burr-Brown 192 KHz/24-bit. The Bi-amping function is implemented only in the Onkyo TX-NR646. The model TX-NR646 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Wireless Internet connection via WIFI is only possible with TX-NR646. Each of the receivers has a Bluetooth connector. The TX-NR646 has access to the Spotify service.
Support for the HDR function can only boast of the TX-NR646. The quality of 4K/60Hz 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-SR343. None of the devices can increase the resolution of the incoming video signal. Review participants do not have the Dolby Vision feature.
The number of HDMI inputs/outputs varies depending on the receiver, the TX-NR646 has 8/2, and the TX-SR343 has 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the TX-NR646 and the TX-SR343. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. TX-NR646 and TX-SR343 support the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Onkyo TX-NR646. 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 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the TX-NR646. Only in the TX-NR646 realized a DTS:X surround technology.