What is better - Denon AVR-S640H vs Pioneer VSX-934?
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 VSX-934 has a power of 80/8, 165/6. A common feature for devices is the same total harmonic distortion - 0.08%.
The manufacturer installed different DACs, the AVR-S640H received the model 192 KHz/32-bit, but the VSX-934 is equipped with AK4458 384 KHz/32-bit. The Bi-amping function is implemented only in the Pioneer VSX-934. Both Denon AVR-S640H and Pioneer VSX-934 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 Denon AVR-S640H works with Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud, but the Pioneer VSX-934 works with Deezer, TIDAL, Pandora. 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 VSX-934. Video scaling is only possible with the VSX-934. Each of the participants of the comparison has a Dolby Vision.
The number of HDMI inputs/outputs varies depending on the receiver, the AVR-S640H has 5/1, and the VSX-934 has 6/2. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the AVR-S640H and the VSX-934. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. AVR-S640H and VSX-934 support the standard HDCP 2.2. Like most receivers, our models have a built-in phono stage for connecting a vinyl player. There is an ECO mode in AVR-S640H. The Denon AVR-S640H and the Pioneer VSX-934 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the VSX-934. Only in the VSX-934 realized a DTS:X surround technology.