It makes sense comparing Marantz NR1508 vs Integra DTM-6 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Marantz NR1508 has 5.2 versus 2.0 for Integra DTM-6. Regarding power, then NR1508 has such a W/Ohm ratio - 50/8 when DTM-6 has a power of 80/8. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for NR1508 and AK4438 384 KHz/32-bit for the DTM-6. None of the models support Bi-amping. The Marantz NR1508 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
WI-FI modules have the same characteristics: 2.4/5GHz. Rivals from our review have Bluetooth support. The Marantz NR1508 has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Spotify can be used on each receiver. The NR1508 can work with the audio stream from Deezer, TIDAL, Pandora, and the DTM-6 can receive a content from Deezer, TIDAL, Pandora, TuneIn Radio.
Only the Marantz NR1508 has support for High dynamic range (HDR). Only the NR1508 provides HDMI signal transmission in standby mode. Both competitors are not able to scale the HDMI signal. Dolby Vision technology found support only on the NR1508. The HDMI Audio Return Channel (ARC) does not support any one of these models. Unfortunately, HDMI eARC is not available on monitored devices. Of the two receivers in our comparison, HDMI CEC is present in only the NR1508. The DTM-6 has a built-in phono stage for connecting a vinyl player. The NR1508 supports voice control via Amazon Alexa, Google Assistant, Siri, Josh.AI, and the DTM-6 - Google Assistant. An ECO mode is only available for the NR1508. The setup assistant will help you configure Marantz NR1508.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.