The Denon AVRS730H 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 AVRS730H has 7.2 versus 9.2 for Pioneer VSX-LX503. Regarding power, then AVRS730H has such a W/Ohm ratio - 75/8, 110/6 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, 384 KHz/32-bit for AVRS730H and AK4458 384 KHz/32-bit for the VSX-LX503. Only the VSX-LX503 supports Bi-amping feature. The Pioneer VSX-LX503 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. The Denon AVRS730H has support for AirPlay, AirPlay 2, and its competitor in our comparison - AirPlay. Spotify can be used on each receiver. The AVRS730H can work with the audio stream from Deezer, TIDAL, iHeart Radio, Sirius XM, Sound Cloud, Napster, 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 AVRS730H. The HDR standard - Dolby Vision is supported by these receivers.
The Denon AVRS730H has 6/1 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.
The AVRS730H supports 2 Multi-room zones, versus 3 for the VSX-LX503. The AVRS730H supports voice control via Amazon Alexa, Google Assistant, Siri, Josh.AI, and the VSX-LX503 - Google Assistant. An ECO mode is only available for the AVRS730H. Both AVRS730H and VSX-LX503 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.