It makes sense comparing Onkyo TX-SR494 vs Integra DTM-6 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Onkyo TX-SR494 has 7.2 versus 2.0 for Integra DTM-6. Regarding power, then TX-SR494 has such a W/Ohm ratio - 135/6 when DTM-6 has a power of 80/8. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, AKM 384 KHz/32-bit for TX-SR494 and AK4438 384 KHz/32-bit for the DTM-6. Only the TX-SR494 supports Bi-amping feature. The Onkyo TX-SR494 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. Only the DTM-6 supports Spotify. Only the TX-SR494 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-SR494 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-SR494. The DTM-6 has a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 2 Multi-room zones. An ECO mode is not present in each of the AV receivers. The setup assistant will help you configure Onkyo TX-SR494.
Only the TX-SR494 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the TX-SR494.