An affordable AV receiver is always a good option to consider, so Onkyo TX-NR696 vs Onkyo TX-8140 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Onkyo TX-NR696 has 7.2 versus 2.0 for Onkyo TX-8140. Regarding power, then TX-NR696 has such a W/Ohm ratio - 165/6 when TX-8140 has a power of 80/8, 110/6. The THD is the same and is 0.08%.
Competitors' digital to analog converter (DAC) is identical to AK4458 384 KHz/32-bit. Only the TX-NR696 supports Bi-amping feature. Each of the AV receivers 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 TX-NR696 can work with the audio stream from Deezer, TIDAL, Pandora, TuneIn Radio, and the TX-8140 can receive a content from SiriusXM. Only the TX-NR696 provides HDMI signal transmission in standby mode. The TX-NR696 can scale the input HDMI signal, unlike the TX-8140. Dolby Vision technology found support only on the TX-NR696. Only the TX-NR696 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 TX-NR696. These compared receivers have a built-in phono stage for connecting a vinyl player. An ECO mode is not present in each of the AV receivers. Both TX-NR696 and TX-8140 can be configured using the Setup assistant.
Only the TX-NR696 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the TX-NR696.