Yamaha RX-V581 vs Yamaha RX-V677 – that is a question.
AV receivers under review have the same number of channels. In terms of power, there are differences, the RX-V581 has such a ratio W/Ohm - 115/6, while the RX-V677 has a power of 90/8, 150/4. A common feature for devices is the same total harmonic distortion - 0.09%.
Competitive models use the same DAC. Each of the compared opponents supports Bi-amping. Both Yamaha RX-V581 and Yamaha RX-V677 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Wireless Internet access via WIFI is possible on both units. Each of the receivers has a Bluetooth connector. Both devices can work with such Apple Music services: AirPlay. Access to the Spotify service is on each of the competitors. The number of available streaming services varies for receivers, the Yamaha RX-V581 works with Pandora, JUKE, but the Yamaha RX-V677 works with Pandora, Napster, JUKE.
Support for the HDR function can only boast of the RX-V581. The quality of 4K/60Hz signal remains unchanged when transmitting from a source to a TV or projector via HDMI for both receivers. Signaling over HDMI in standby mode can provide the RX-V581 and the RX-V677. Video scaling is only possible with the RX-V677. Review participants do not have the Dolby Vision feature.
The number of HDMI inputs/outputs varies depending on the receiver, the RX-V581 has 4/1, and the RX-V677 has 6/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the RX-V581 and the RX-V677. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. RX-V581 and RX-V677 support the standard HDCP 2.2. Unlike most receivers, our models do not have a built-in phono stage for connecting a vinyl player.
Ability to create 2 Multi zones inherent in both AV receivers. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in either AV receiver. The Yamaha RX-V581 and the Yamaha RX-V677 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the RX-V581. Only in the RX-V581 realized a DTS:X surround technology.