An affordable AV receiver is always a good option to consider, so Marantz NR1504 vs Denon AVR-X1400H comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Marantz NR1504 has 5.1 versus 7.2 for Denon AVR-X1400H. Regarding power, then NR1504 has such a W/Ohm ratio - 50/8, 60/6 when AVR-X1400H has a power of 80/8, 120/6. The THD is the same and is 0.08%.
Competitors' digital to analog converter (DAC) is identical to 192 KHz/24-bit. Only the AVR-X1400H supports Bi-amping feature. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Only the Denon AVR-X1400H can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. The Marantz NR1504 has support for AirPlay, and its competitor in our comparison - AirPlay, AirPlay 2. Spotify can be used on each receiver. The NR1504 can work with the audio stream from Pandora, SiriusXM, and the AVR-X1400H can receive a content from Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud.
Only the Denon AVR-X1400H has support for High dynamic range (HDR). HDMI signal transmission in standby mode is implemented in each of the devices. Both competitors are not able to scale the HDMI signal. Dolby Vision technology found support only on the AVR-X1400H.
Each receiver has 6/1 HDMI inputs/outputs. 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. Receivers do not have a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the AVR-X1400H. Both NR1504 and AVR-X1400H can be configured using the Setup assistant.
Only the AVR-X1400H has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the AVR-X1400H.