An affordable AV receiver is always a good option to consider, so Denon DRA-800H vs Onkyo TX-8140 comparison definitely makes sense.
Considered AV receivers have the same number of channels 2.0. Regarding power, then DRA-800H has such a W/Ohm ratio - 100/8, 120/6 when TX-8140 has a power of 80/8, 110/6. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for DRA-800H and AK4458 384 KHz/32-bit for the TX-8140. None of the models support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing. None of the competitors supports Auto speaker calibration.
Both models have the ability to connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. Spotify can be used on each receiver. The DRA-800H 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 DRA-800H provides HDMI signal transmission in standby mode. Both competitors are not able to scale the HDMI signal. Dolby Vision technology found support only on the DRA-800H. Only the DRA-800H supports HDMI Audio Return Channel (ARC). Unfortunately, HDMI eARC is not available on monitored devices. Of the two receivers in our comparison, HDMI CEC is present in only the DRA-800H. These compared receivers have a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the DRA-800H. Both DRA-800H and TX-8140 can be configured using the Setup assistant.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.