The Marantz NR1609 vs Marantz NR1504 comparison proves that these receivers have many common features.
A significant difference between the receivers in the number of channels, Marantz NR1609 has 7.2 versus 5.1 for Marantz NR1504. Regarding power, then NR1609 has such a W/Ohm ratio - 50/8, 70/6 when NR1504 has a power of 50/8, 60/6. The THD is the same and is 0.08%.
Competitors' digital to analog converter (DAC) is identical to 192 KHz/24-bit. Only the NR1609 supports Bi-amping feature. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. The Marantz NR1609 has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Spotify can be used on each receiver. The NR1609 can work with the audio stream from Deezer, Pandora, TuneIn Radio, and the NR1504 can receive a content from Pandora, SiriusXM.
Only the Marantz NR1609 has support for High dynamic range (HDR). HDMI signal transmission in standby mode is implemented in each of the devices. The NR1609 can scale the input HDMI signal, unlike the NR1504. Dolby Vision technology found support only on the NR1609.
The Marantz NR1609 has 8/1 HDMI inputs/outputs versus 6/1 HDMI connectors of the Marantz NR1504. 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 NR1609 has a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the NR1609. Both NR1609 and NR1504 can be configured using the Setup assistant.
Only the NR1609 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the NR1609.