It makes sense comparing Yamaha RX-A880 vs Marantz SR6014 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Yamaha RX-A880 has 7.2 versus 9.2 for Marantz SR6014. Regarding power, then RX-A880 has such a W/Ohm ratio - 100/8 20Hz-20KHz, 160/4 1KHz when SR6014 has a power of 110/8 20Hz-20KHz, 185/6 1KHz. The THD is 0.06% for the RX-A880 but 0.08% for the SR6014.
Characteristics of digital to analog converter (DAC) are different, Burr-Brown 384 KHz/32-bit for RX-A880 and AK4458 384 KHz/32-bit for the SR6014. Both the RX-A880 and the SR6014 support Bi-amping. 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 RX-A880 can work with the audio stream from Deezer, TIDAL, Pandora, Napster, SiriusXM, Qobuz, and the SR6014 can receive a content from Deezer, TIDAL, Pandora, TuneIn Radio, iHeart Radio.
Both AV receivers support HDR10 technology (High dynamic range). Compared AV receivers retain the quality of 4K 60p 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 Yamaha RX-A880 has 7/2 HDMI inputs/outputs versus 8/3 HDMI connectors of the Marantz SR6014. 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. The RX-A880 supports the protection of digital content of the standard HDCP 2.2, versus HDCP 2.3 in the SR6014. These compared receivers have a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 2 Multi-room zones. The RX-A880 supports voice control via Amazon Alexa, Google Assistant, and the SR6014 - Amazon Alexa, Google Assistant, Siri, Josh.AI. It is also worth noting that the ECO mode is presented in each of the receivers. Both RX-A880 and SR6014 can be configured using the Setup assistant.
Both devices have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices under review.
The Marantz SR6014 is better receiver in this comparison. Check Marantz SR6014 price