Having had an opportunity to test Onkyo TX-SR343 vs Onkyo TX-NR616, I’d like to share my impression here to facilitate your choice of a new AV receiver.
The number of channels for receivers is different - 5.1 versus 7.2, respectively, for devices. In terms of power, there are differences, the TX-SR343 has such a ratio W/Ohm - 100/6, while the TX-NR616 has a power of 160/6. A common feature for devices is the same total harmonic distortion - 0.08%.
The manufacturer installed different DACs, the TX-SR343 received the model TI Burr-Brown 192 KHz/24-bit, but the TX-NR616 is equipped with Burr-Brown 192 KHz/24-bit. The Bi-amping function is implemented only in the Onkyo TX-NR616. The model TX-NR616 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Wireless Internet connection via WIFI is only possible with TX-NR616. Each of the receivers has a Bluetooth connector. Support for Apple Music Services not implemented. The TX-NR616 has access to the Spotify service.
Oddly enough, the support for the HDR function is not implemented in these units. 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-SR343 and the TX-NR616. Video scaling is only possible with the TX-NR616. Review participants do not have the Dolby Vision feature.
The number of HDMI inputs/outputs varies depending on the receiver, the TX-SR343 has 4/1, and the TX-NR616 has 8/2. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the TX-SR343 and the TX-NR616. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. TX-SR343 and TX-NR616 support the standard HDCP 2.2. Unlike most receivers, our models do not have a built-in phono stage for connecting a vinyl player. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in neither AV receiver. None of these units can be properly configured using the setup assistant.
Generally no support for a Dolby Atmos multichannel audio format. A DTS:X surround technology is not supported by devices from our comparison.