An affordable AV receiver is always a good option to consider, so Denon HEOS AVR vs Marantz SR6013 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Denon HEOS AVR has 5.1 versus 9.2 for Marantz SR6013. Regarding power, then HEOS AVR has such a W/Ohm ratio - 50/8, 65/6 when SR6013 has a power of 110/8, 150/6. The THD is 0.05% for the HEOS AVR but 0.08% for the SR6013. Only the SR6013 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. Spotify can be used on each receiver. The HEOS AVR can work with the audio stream from Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud, and the SR6013 can receive a content from Deezer, TIDAL, Pandora, TuneIn Radio.
Only the Marantz SR6013 has support for High dynamic range (HDR). Compared AV receivers retain the quality of 4K/60Hz signal when transmitting from a source to a TV or projector. HDMI signal transmission in standby mode is implemented in each of the devices. The SR6013 can scale the input HDMI signal, unlike the HEOS AVR. Dolby Vision technology found support only on the SR6013.
The Denon HEOS AVR has 4/1 HDMI inputs/outputs versus 8/3 HDMI connectors of the Marantz SR6013. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the SR6013. 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 SR6013 has a built-in phono stage for connecting a vinyl player. The HEOS AVR supports voice control via Amazon Alexa, Google Assistant, and the SR6013 - Amazon Alexa, Google Assistant, Siri, Josh.AI. An ECO mode is only available for the SR6013. The setup assistant will help you configure Marantz SR6013.
Only the SR6013 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the SR6013.