An affordable AV receiver is always a good option to consider, so Onkyo TX-SR343 vs Denon AVR-X4000 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Onkyo TX-SR343 has 5.1 versus 7.2 for Denon AVR-X4000. Regarding power, then TX-SR343 has such a W/Ohm ratio - 100/6 when AVR-X4000 has a power of 125/8, 165/6. The THD is 0.08% for the TX-SR343 but 0.05% for the AVR-X4000.
Characteristics of digital to analog converter (DAC) are different, TI Burr-Brown 192 KHz/24-bit for TX-SR343 and 192 KHz/24-bit for the AVR-X4000. Only the AVR-X4000 supports Bi-amping feature. The Denon AVR-X4000 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Only the Denon AVR-X4000 can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. Only the AVR-X4000 supports Spotify.
HDR is not available on each model. Compared AV receivers retain the quality of 4K/60Hz signal when transmitting from a source to a TV or projector. HDMI signal transmission in standby mode is implemented in each of the devices. The AVR-X4000 can scale the input HDMI signal, unlike the TX-SR343. The HDR standard - Dolby Vision is not supported by these receivers.
The Onkyo TX-SR343 has 4/1 HDMI inputs/outputs versus 7/3 HDMI connectors of the Denon AVR-X4000. The HDMI Audio Return Channel (ARC) feature supports both devices. Unfortunately, HDMI eARC is not available on monitored devices. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. Both models support the standard HDCP 2.2. The AVR-X4000 has a built-in phono stage for connecting a vinyl player. A voice control is not available. An ECO mode is not present in each of the AV receivers. The setup assistant will help you configure Denon AVR-X4000.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.