Onkyo TX-SR343 vs Onkyo TX-NR757 – that is a question.
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-NR757 has a power of 110/8, 180/6. 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-NR757 is equipped with AK4458 384 KHz/32-bit. The Bi-amping function is implemented only in the Onkyo TX-NR757. The model TX-NR757 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Wireless Internet connection via WIFI is only possible with TX-NR757. Each of the receivers has a Bluetooth connector. The TX-NR757 has access to the Spotify service.
Support for the HDR function can only boast of the TX-NR757. 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-NR757. None of the devices can increase the resolution of the incoming video signal. Operation with the Dolby Vision is only possible with the TX-NR757.
The number of HDMI inputs/outputs varies depending on the receiver, the TX-SR343 has 4/1, and the TX-NR757 has 8/2. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the TX-SR343 and the TX-NR757. When comparing receivers, it becomes clear that only the Onkyo TX-SR343 has HDMI CEC. TX-SR343 and TX-NR757 support the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Onkyo TX-NR757. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in neither AV receiver. The Onkyo TX-NR757 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the TX-NR757. Only in the TX-NR757 realized a DTS:X surround technology.