It’s strongly recommended to compare different receivers if you want to choose the best one: Marantz NR1711 vs Marantz NR1506.
The number of channels for receivers is different - 7.2 versus 5.2, respectively, for devices. In terms of power, there are differences, the NR1711 has such a ratio W/Ohm - 50/8, 70/6, while the NR1506 has a power of 50/8, 60/6. The value of total harmonic distortion is also different, and for the NR1711 it is 0.08%, but for the NR1506 it is 0.05%. The Bi-amping function is implemented only in the Marantz NR1711. Both Marantz NR1711 and Marantz NR1506 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Each of the receivers has a Bluetooth connector. The contenders have differences in the supported services from Apple - AirPlay, AirPlay 2 versus AirPlay respectively. Access to the Spotify service is on each of the competitors. The number of available streaming services varies for receivers, the Marantz NR1711 works with Deezer, TIDAL, Pandora, SiriusXM, Napster, SoundCloud, but the Marantz NR1506 works with Pandora, SiriusXM. Signaling over HDMI in standby mode can provide the NR1711 and the NR1506. Video scaling is only possible with the NR1711. Operation with the Dolby Vision is only possible with the NR1711.
The number of HDMI inputs/outputs is the same - 6/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is only supported by the NR1711. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. The NR1711 has support for the standard HDCP 2.3, compared to the NR1506, which supports the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Marantz NR1711. There is an ECO mode in either AV receiver. The Marantz NR1711 and the Marantz NR1506 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the NR1711. Only in the NR1711 realized a DTS:X surround technology.