An affordable AV receiver is always a good option to consider, so Denon AVR-X2400H vs Pioneer VSX-S520 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Denon AVR-X2400H has 7.2 versus 5.1 for Pioneer VSX-S520. Regarding power, then AVR-X2400H has such a W/Ohm ratio - 95/8, 125/6 when VSX-S520 has a power of 50/4. The THD is 0.08% for the AVR-X2400H but 0.09% for the VSX-S520.
Competitors' digital to analog converter (DAC) is identical to 192 KHz/24-bit. None of the models 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 Denon AVR-X2400H has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Spotify can be used on each receiver. The AVR-X2400H can work with the audio stream from Deezer, TIDAL, iHeart Radio, Sirius XM, Sound Cloud, Napster, and the VSX-S520 can receive a content from Deezer, TIDAL, TuneIn Radio.
These units support HDR technology. Compared AV receivers retain the quality of 4K/60Hz signal when transmitting from a source to a TV or projector. HDMI signal transmission in standby mode is implemented in each of the devices. The VSX-S520 can scale the input HDMI signal, unlike the AVR-X2400H. The HDR standard - Dolby Vision is supported by these receivers.
The Denon AVR-X2400H has 8/2 HDMI inputs/outputs versus 4/1 HDMI connectors of the Pioneer VSX-S520. The HDMI Audio Return Channel (ARC) feature supports both devices. Unfortunately, HDMI eARC is not available on monitored devices. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. Both models support the standard HDCP 2.2. The VSX-S520 has a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the AVR-X2400H. Both AVR-X2400H and VSX-S520 can be configured using the Setup assistant.
Both devices have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices under review.