The Pioneer VSX-LX503 vs Pioneer SC-LX801 comparison proves that these receivers have many common features.
Considered AV receivers have the same number of channels 9.2. Regarding power, then VSX-LX503 has such a W/Ohm ratio - 120/8, 230/6 when SC-LX801 has a power of 140/8, 200/6, 255/4. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, AK4458 384 KHz/32-bit for VSX-LX503 and ESS SABRE32 Ultra 192 KHz/32-bit for the SC-LX801. Both the VSX-LX503 and the SC-LX801 support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
WI-FI modules have the same characteristics: 2.4/5GHz. Rivals from our review have Bluetooth support. The Apple Music service is implemented on considered devices: AirPlay. Spotify can be used on each receiver. The VSX-LX503 can work with the audio stream from Deezer, TIDAL, Pandora, TuneIn Radio, and the SC-LX801 can receive a content from Deezer, TIDAL, Pandora.
Both AV receivers support HDR10 technology (High dynamic range). 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. Both rivals can scale the resolution of the incoming HDMI signal. The HDR standard - Dolby Vision is supported by these receivers.
The Pioneer VSX-LX503 has 7/2 HDMI inputs/outputs versus 8/2 HDMI connectors of the Pioneer SC-LX801. 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. These compared receivers have a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 3 Multi-room zones. An ECO mode is not present in each of the AV receivers. Both VSX-LX503 and SC-LX801 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.