An affordable AV receiver is always a good option to consider, so Marantz NR1509 vs Onkyo TX-SR393 comparison definitely makes sense.
Considered AV receivers have the same number of channels 5.2. Regarding power, then NR1509 has such a W/Ohm ratio - 50/8, 60/6 when TX-SR393 has a power of 80/8, 155/6. The THD is the same and is 0.08%.
Characteristics of digital to analog converter (DAC) are different, 192 KHz/24-bit for NR1509 and AKM 384 KHz/32-bit for the TX-SR393. None of the models support Bi-amping. The Marantz NR1509 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. Only the NR1509 supports Spotify. Compared AV receivers retain the quality of 4K/60Hz signal when transmitting from a source to a TV or projector. HDMI signal transmission in standby mode is implemented in each of the devices. The TX-SR393 can scale the input HDMI signal, unlike the NR1509. The HDR standard - Dolby Vision is supported by these receivers.
The Marantz NR1509 has 7/1 HDMI inputs/outputs versus 4/1 HDMI connectors of the Onkyo TX-SR393. The HDMI Audio Return Channel (ARC) feature supports both devices. Unfortunately, HDMI eARC is not available on monitored devices. 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 NR1509 has a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the NR1509. The setup assistant will help you configure Marantz NR1509.
Only the TX-SR393 has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the TX-SR393.