Having had an opportunity to test Sony STRZA1100ES vs Yamaha RX-S602, I’d like to share my impression here to facilitate your choice of a new AV receiver.
The number of channels for receivers is different - 7.2 versus 5.1, respectively, for devices. In terms of power, there are differences, the STRZA1100ES has such a ratio W/Ohm - 70/8, 90/6, while the RX-S602 has a power of 80/8, 125/6. The value of total harmonic distortion is also different, and for the STRZA1100ES it is 0.09%, but for the RX-S602 it is 0.08%. Each of the compared opponents supports Bi-amping. Both Sony STRZA1100ES and Yamaha RX-S602 can transmit an audio signal directly to the amplifier and bypasses any DSP processing. There is a Bluetooth protocol at the RX-S602. The RX-S602 has access to the Spotify service.
The HDR10 function is present in each of the rivals. The quality of 4K/60Hz signal remains unchanged when transmitting from a source to a TV or projector via HDMI for both receivers. Signaling over HDMI in standby mode can provide the STRZA1100ES and the RX-S602. Video scaling is only possible with the STRZA1100ES. Operation with the Dolby Vision is only possible with the STRZA1100ES.
The number of HDMI inputs/outputs varies depending on the receiver, the STRZA1100ES has 5/2, and the RX-S602 has 4/1. HDMI Audio Return Channel is implemented in both devices. HDMI eARC is only supported by the STRZA1100ES. When comparing receivers, it becomes clear that each of the rivals can work with HDMI CEC. The STRZA1100ES has support for the standard HDCP 2.2, compared to the RX-S602, which supports the standard HDCP 2.3. Unlike most receivers, our models do not have a built-in phono stage for connecting a vinyl player.
Ability to create 2 Multi zones inherent in both AV receivers. There is an ECO mode in RX-S602. The Sony STRZA1100ES and the Yamaha RX-S602 can be properly configured using the setup assistant.
A Dolby Atmos multichannel audio format is available only in the STRZA1100ES. Only in the STRZA1100ES realized a DTS:X surround technology.