Denon AVR-X540BT vs Onkyo TX-SR494 – that is a question.
The number of channels for receivers is different - 5.2 versus 7.2, respectively, for devices. In terms of power, there are differences, the AVR-X540BT has such a ratio W/Ohm - 70/8, 90/6, while the TX-SR494 has a power of 135/6. A common feature for devices is the same total harmonic distortion - 0.08%.
The manufacturer installed different DACs, the AVR-X540BT received the model 192 KHz/24-bit, but the TX-SR494 is equipped with AKM 384 KHz/32-bit. The Bi-amping function is implemented only in the Onkyo TX-SR494. Both Denon AVR-X540BT and Onkyo TX-SR494 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Wireless connection to the Internet via WIFI can not be performed on these receivers. Each of the receivers has a Bluetooth connector. Support for Apple Music Services not implemented. The AVR-X540BT has access to the Spotify service. The quality of 4K/60Hz signal remains unchanged when transmitting from a source to a TV or projector via HDMI for both receivers. Signaling over HDMI in standby mode can provide the AVR-X540BT and the TX-SR494. None of the devices can increase the resolution of the incoming video signal. Operation with the Dolby Vision is only possible with the AVR-X540BT.
The number of HDMI inputs/outputs varies depending on the receiver, the AVR-X540BT has 5/1, and the TX-SR494 has 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is not supported by the AVR-X540BT and the TX-SR494. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. AVR-X540BT and TX-SR494 support the standard HDCP 2.2. Unlike most receivers, our models do not have a built-in phono stage for connecting a vinyl player. Voice control of the basic functions of the receiver is not realized in both models. There is an ECO mode in AVR-X540BT. The Denon AVR-X540BT and the Onkyo TX-SR494 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the TX-SR494. Only in the TX-SR494 realized a DTS:X surround technology.