What is better - Denon AVR-S640H vs Denon AVR-S720W?
The number of channels for receivers is different - 5.2 versus 7.2, respectively, for devices. In terms of power, there are differences, the AVR-S640H has such a ratio W/Ohm - 75/8, 100/6, while the AVR-S720W has a power of 75/8, 110/6. A common feature for devices is the same total harmonic distortion - 0.08%.
Competitive models use the same DAC. None of the compared opponents supports Bi-amping. Both Denon AVR-S640H and Denon AVR-S720W 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. The contenders have differences in the supported services from Apple - AirPlay, AirPlay 2 versus AirPlay respectively. Access to the Spotify service is on each of the competitors. The number of available streaming services varies for receivers, the Denon AVR-S640H works with Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud, but the Denon AVR-S720W works with Pandora, SiriusXM.
Support for the HDR function can only boast of each of the AV receivers. 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 AVR-S640H and the AVR-S720W. None of the devices can increase the resolution of the incoming video signal. Operation with the Dolby Vision is only possible with the AVR-S640H.
The number of HDMI inputs/outputs varies depending on the receiver, the AVR-S640H has 5/1, and the AVR-S720W has 6/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the AVR-S640H and the AVR-S720W. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. AVR-S640H and AVR-S720W support the standard HDCP 2.2. In the presence of a built-in phono stage for connecting a vinyl player only at Denon AVR-S640H. There is an ECO mode in either AV receiver. The Denon AVR-S640H and the Denon AVR-S720W can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the AVR-S720W. Only in the AVR-S720W realized a DTS:X surround technology.