Marantz SR5015 vs Denon AVR-S670H comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Marantz SR5015 has 7.2 versus 5.2 for Denon AVR-S670H. Regarding power, then SR5015 has such a W/Ohm ratio - 100/8, 200/6 when AVR-S670H has a power of 75/8, 100/6. The THD is the same and is 0.08%. Only the SR5015 supports Bi-amping feature. Each of the AV receivers 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 Apple Music service is implemented on considered devices: AirPlay, AirPlay 2. Spotify can be used on each receiver. The SR5015 can work with the audio stream from Deezer, TIDAL, Pandora, SiriusXM, Napster, SoundCloud, and the AVR-S670H can receive a content from Deezer, TIDAL, Pandora, SiriusXM, Napster, SoundCloud, Amazon Music, Amazon Music HD, MOOD:Mix.
Both AV receivers support HDR10+ technology (High dynamic range). Compared AV receivers retain the quality of 4K/120Hz 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 supported by these receivers.
The Marantz SR5015 has 6/2 HDMI inputs/outputs versus 6/1 HDMI connectors of the Denon AVR-S670H. The HDMI Audio Return Channel (ARC) feature supports both devices. HDMI eARC is available in each model. 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 2.3. These compared receivers have a built-in phono stage for connecting a vinyl player. Supported voice control technologies are identical - Amazon Alexa, Google Assistant, Siri, Josh.AI. It is also worth noting that the ECO mode is presented in each of the receivers. Both SR5015 and AVR-S670H can be configured using the Setup assistant.
Only the SR5015 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the SR5015.