Yamaha RX-V675 vs Yamaha RX-V4A comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Yamaha RX-V675 has 7.2 versus 5.2 for Yamaha RX-V4A. Regarding power, then RX-V675 has such a W/Ohm ratio - 90/8, 150/4 when RX-V4A has a power of 80/6. The THD is 0.09% for the RX-V675 but 0.06% for the RX-V4A. Both the RX-V675 and the RX-V4A support Bi-amping. 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. The Yamaha RX-V675 has support for AirPlay, and its competitor in our comparison - AirPlay, AirPlay 2. Spotify can be used on each receiver. The RX-V675 can work with the audio stream from Napster, and the RX-V4A can receive a content from Deezer, TIDAL, Pandora, SiriusXM, Qobuz. 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-V675 has 6/1 HDMI inputs/outputs versus 4/1 HDMI connectors of the Yamaha RX-V4A. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the RX-V4A. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. The RX-V675 supports the protection of digital content of the standard HDCP 2.2, versus HDCP 2.3 in the RX-V4A. Receivers do not have a built-in phono stage for connecting a vinyl player. It is also worth noting that the ECO mode is presented in each of the receivers. The setup assistant will help you configure Yamaha RX-V4A.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.