Having had an opportunity to test Yamaha RX-V4A vs Denon AVR-X2500H, I’d like to share my impression here to facilitate your choice of a new AV receiver.
The number of channels for receivers is different - 5.2 versus 7.2, respectively, for devices. In terms of power, there are differences, the RX-V4A has such a ratio W/Ohm - 80/6, while the AVR-X2500H has a power of 95/8, 125/6. The value of total harmonic distortion is also different, and for the RX-V4A it is 0.06%, but for the AVR-X2500H it is 0.08%. Each of the compared opponents supports Bi-amping. Both Yamaha RX-V4A and Denon AVR-X2500H can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Each of the receivers has a Bluetooth connector. Both devices can work with such Apple Music services: AirPlay, AirPlay 2. Access to the Spotify service is on each of the competitors. The number of available streaming services varies for receivers, the Yamaha RX-V4A works with Deezer, TIDAL, Pandora, SiriusXM, Qobuz, but the Denon AVR-X2500H works with Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud.
The HDR10 function is present in each of the rivals. Signaling over HDMI in standby mode can provide the RX-V4A and the AVR-X2500H. Video scaling is only possible with the RX-V4A. Each of the participants of the comparison has a Dolby Vision.
The number of HDMI inputs/outputs varies depending on the receiver, the RX-V4A has 4/1, and the AVR-X2500H has 8/2. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is only supported by the RX-V4A. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. The RX-V4A has support for the standard HDCP 2.3, compared to the AVR-X2500H, which supports the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Denon AVR-X2500H. For voice control in the RX-V4A is used Amazon Alexa, Google Assistant, Siri, but in the AVR-X2500H is used Amazon Alexa, Google Assistant, Siri, Josh.AI. There is an ECO mode in either AV receiver. The Yamaha RX-V4A and the Denon AVR-X2500H can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the AVR-X2500H. Only in the AVR-X2500H realized a DTS:X surround technology.