It makes sense comparing Denon AVR-X4000 vs Denon AVR-X2300W because they both are able to give some premium features.
Considered AV receivers have the same number of channels 7.2. Regarding power, then AVR-X4000 has such a W/Ohm ratio - 125/8, 165/6 when AVR-X2300W has a power of 95/8, 125/6. The THD is 0.05% for the AVR-X4000 but 0.08% for the AVR-X2300W.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for AVR-X4000 and Burr-Brown 192 KHz/24-bit for the AVR-X2300W. Both the AVR-X4000 and the AVR-X2300W support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Both models have the ability to connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. The Apple Music service is implemented on considered devices: AirPlay. Spotify can be used on each receiver. The AVR-X4000 can work with the audio stream from Pandora, Sirius XM, and the AVR-X2300W can receive a content from Pandora, SiriusXM.
Only the Denon AVR-X2300W has support for High dynamic range (HDR). 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. Both rivals can scale the resolution of the incoming HDMI signal. The HDR standard - Dolby Vision is not supported by these receivers.
The Denon AVR-X4000 has 7/3 HDMI inputs/outputs versus 8/2 HDMI connectors of the Denon AVR-X2300W. 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.
The AVR-X4000 supports 3 Multi-room zones, versus 2 for the AVR-X2300W. A voice control is not available. An ECO mode is only available for the AVR-X2300W. Both AVR-X4000 and AVR-X2300W can be configured using the Setup assistant.
Only the AVR-X2300W has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the AVR-X2300W.