An affordable AV receiver is always a good option to consider, so Denon AVRS730H vs Onkyo TX-8140 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Denon AVRS730H has 7.2 versus 2.0 for Onkyo TX-8140. Regarding power, then AVRS730H has such a W/Ohm ratio - 75/8, 110/6 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, 384 KHz/32-bit for AVRS730H and AK4458 384 KHz/32-bit for the TX-8140. None of the models support Bi-amping. The Onkyo TX-8140 can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
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 AVRS730H can work with the audio stream from Deezer, TIDAL, iHeart Radio, Sirius XM, Sound Cloud, Napster, and the TX-8140 can receive a content from SiriusXM.
Only the Denon AVRS730H has support for High dynamic range (HDR). Only the AVRS730H 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 AVRS730H. Only the AVRS730H 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 AVRS730H. The TX-8140 has a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the AVRS730H. Both AVRS730H and TX-8140 can be configured using the Setup assistant.
Only the AVRS730H has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the AVRS730H.