An affordable AV receiver is always a good option to consider, so Onkyo TX-SR353 vs Marantz SR6013 comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Onkyo TX-SR353 has 5.1 versus 9.2 for Marantz SR6013. Regarding power, then TX-SR353 has such a W/Ohm ratio - 140/6 when SR6013 has a power of 110/8, 150/6. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for TX-SR353 and AK4458 384 KHz/32-bit for the SR6013. Only the SR6013 supports Bi-amping feature. The Marantz SR6013 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. Only the SR6013 supports Spotify.
Only the Marantz SR6013 has support for High dynamic range (HDR). HDMI signal transmission in standby mode is implemented in each of the devices. The SR6013 can scale the input HDMI signal, unlike the TX-SR353. Dolby Vision technology found support only on the SR6013.
The Onkyo TX-SR353 has 4/1 HDMI inputs/outputs versus 8/3 HDMI connectors of the Marantz SR6013. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the SR6013. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. Both models support the standard HDCP 2.2. The SR6013 has a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the SR6013. The setup assistant will help you configure Marantz SR6013.
Only the SR6013 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the SR6013.