An affordable AV receiver is always a good option to consider, so Denon AVR-X8500HSP vs Onkyo TX-8140 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Denon AVR-X8500HSP has 13.2 versus 2.0 for Onkyo TX-8140. Regarding power, then AVR-X8500HSP has such a W/Ohm ratio - 150/8, 190/6 when TX-8140 has a power of 80/8, 110/6. The THD is 0.05% for the AVR-X8500HSP but 0.08% for the TX-8140.
Characteristics of digital to analog converter (DAC) are different, AK4490 384 KHz/32-bit for AVR-X8500HSP and AK4458 384 KHz/32-bit for the TX-8140. Only the AVR-X8500HSP 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-X8500HSP can work with the audio stream from Deezer, TIDAL, Pandora, Napster, SiriusXM, TuneIn Radio, iHeart Radio, Sound Cloud, and the TX-8140 can receive a content from SiriusXM.
Only the Denon AVR-X8500HSP has support for High dynamic range (HDR). Only the AVR-X8500HSP provides HDMI signal transmission in standby mode. The AVR-X8500HSP can scale the input HDMI signal, unlike the TX-8140. Dolby Vision technology found support only on the AVR-X8500HSP. Only the AVR-X8500HSP supports HDMI Audio Return Channel (ARC). The HDMI eARC is available only on the AVR-X8500HSP. Of the two receivers in our comparison, HDMI CEC is present in only the AVR-X8500HSP. These compared receivers have a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the AVR-X8500HSP. Both AVR-X8500HSP and TX-8140 can be configured using the Setup assistant.
Only the AVR-X8500HSP has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the AVR-X8500HSP.