An affordable AV receiver is always a good option to consider, so Onkyo TX-SR383 vs Onkyo TX-8140 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Onkyo TX-SR383 has 7.2 versus 2.0 for Onkyo TX-8140. Regarding power, then TX-SR383 has such a W/Ohm ratio - 100/8, 135/6 when TX-8140 has a power of 80/8, 110/6. The THD is 0.09% for the TX-SR383 but 0.08% for the TX-8140.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for TX-SR383 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.
Only the Onkyo TX-8140 can connect to the Internet via WI-FI. Rivals from our review have Bluetooth support. Each of these units does not support Apple Music. Only the TX-8140 supports Spotify.
Only the Onkyo TX-SR383 has support for High dynamic range (HDR). Only the TX-SR383 provides HDMI signal transmission in standby mode. Both competitors are not able to scale the HDMI signal. The HDR standard - Dolby Vision is not supported by these receivers. Only the TX-SR383 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-SR383. The TX-8140 has a built-in phono stage for connecting a vinyl player. A voice control is not available. An ECO mode is not present in each of the AV receivers. The setup assistant will help you configure Onkyo TX-8140.
None of the rivals equipped with Dolby Atmos multichannel audio decoder. The receivers do not support the surround sound technology DTS:X.