The Onkyo TX-SR494 vs Denon AVR-X4100W comparison proves that these receivers have many common features.
Considered AV receivers have the same number of channels 7.2. Regarding power, then TX-SR494 has such a W/Ohm ratio - 135/6 when AVR-X4100W has a power of 125/8, 165/6. The THD is 0.08% for the TX-SR494 but 0.05% for the AVR-X4100W.
Characteristics of digital to analog converter (DAC) are different, AKM 384 KHz/32-bit for TX-SR494 and 192 KHz/24-bit for the AVR-X4100W. Both the TX-SR494 and the AVR-X4100W support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Only the Denon AVR-X4100W can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. Only the AVR-X4100W supports Spotify. 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 AVR-X4100W can scale the input HDMI signal, unlike the TX-SR494. Dolby Vision technology found support only on the AVR-X4100W.
The Onkyo TX-SR494 has 4/1 HDMI inputs/outputs versus 8/3 HDMI connectors of the Denon AVR-X4100W. 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. The AVR-X4100W has a built-in phono stage for connecting a vinyl player.
The TX-SR494 supports 2 Multi-room zones, versus 3 for the AVR-X4100W. A voice control is not available. An ECO mode is only available for the AVR-X4100W. Both TX-SR494 and AVR-X4100W can be configured using the Setup assistant.
Both devices have support for Dolby Atmos multichannel audio format. A surround technology DTS:X is supported only by the TX-SR494.