An affordable AV receiver is always a good option to consider, so Onkyo TX-SR353 vs Denon AVR-X6700H comparison definitely makes sense.
A significant difference between the receivers in the number of channels, Onkyo TX-SR353 has 5.1 versus 11.2 for Denon AVR-X6700H. Regarding power, then TX-SR353 has such a W/Ohm ratio - 140/6 when AVR-X6700H has a power of 140/8, 175/6. The THD is 0.08% for the TX-SR353 but 0.05% for the AVR-X6700H. Only the AVR-X6700H supports Bi-amping feature. The Denon AVR-X6700H can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Rivals from our review have Bluetooth support. Only the AVR-X6700H supports Spotify. HDMI signal transmission in standby mode is implemented in each of the devices. The AVR-X6700H can scale the input HDMI signal, unlike the TX-SR353. Dolby Vision technology found support only on the AVR-X6700H.
The Onkyo TX-SR353 has 4/1 HDMI inputs/outputs versus 8/3 HDMI connectors of the Denon AVR-X6700H. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the AVR-X6700H. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. The TX-SR353 supports the protection of digital content of the standard HDCP 2.2, versus HDCP 2.3 in the AVR-X6700H. The AVR-X6700H has a built-in phono stage for connecting a vinyl player. An ECO mode is only available for the AVR-X6700H. The setup assistant will help you configure Denon AVR-X6700H.
Only the AVR-X6700H has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the AVR-X6700H.