The Denon AVR-X540BT vs Pioneer VSX-LX503 comparison proves that these receivers have many common features.
A significant difference between the receivers in the number of channels, Denon AVR-X540BT has 5.2 versus 9.2 for Pioneer VSX-LX503. Regarding power, then AVR-X540BT has such a W/Ohm ratio - 70/8, 90/6 when VSX-LX503 has a power of 120/8, 230/6. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for AVR-X540BT and AK4458 384 KHz/32-bit for the VSX-LX503. Only the VSX-LX503 supports Bi-amping feature. 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. Spotify can be used on each receiver. The AVR-X540BT can work with the audio stream from TIDAL, Pandora, and the VSX-LX503 can receive a content from Deezer, TIDAL, Pandora, TuneIn Radio. 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-LX503 can scale the input HDMI signal, unlike the AVR-X540BT. The HDR standard - Dolby Vision is supported by these receivers.
The Denon AVR-X540BT has 5/1 HDMI inputs/outputs versus 7/2 HDMI connectors of the Pioneer VSX-LX503. 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-LX503 has a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the AVR-X540BT. Both AVR-X540BT and VSX-LX503 can be configured using the Setup assistant.
Only the VSX-LX503 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the VSX-LX503.